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MDN JavaScript pagina's

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# Page Tags and summary
1 JavaScript JavaScript, Landing, Learn
JavaScript (JS) is a lightweight, interpreted, programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as node.js and Apache CouchDB. JS is a prototype-based, multi-paradigm, dynamic scripting language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles. Read more about JavaScript.
2 A re-introduction to JavaScript (JS tutorial) CodingScripting, Intermediate, Intro, JavaScript, Learn, Tutorial
Why a re-introduction? Because JavaScript is notorious for being the world's most misunderstood programming language. It is often derided as being a toy, but beneath its layer of deceptive simplicity, powerful language features await. JavaScript is now used by an incredible number of high-profile applications, showing that deeper knowledge of this technology is an important skill for any web or mobile developer.
3 About JavaScript Beginner, Introduction, JavaScript
JavaScript® (often shortened to JS) is a lightweight, interpreted, object-oriented language with first-class functions, and is best known as the scripting language for Web pages, but it's used in many non-browser environments as well. It is a prototype-based, multi-paradigm scripting language that is dynamic, and supports object-oriented, imperative, and functional programming styles.
4 Closures Closure, Intermediate, JavaScript
Closures are functions that refer to independent (free) variables (variables that are used locally, but defined in an enclosing scope). In other words, these functions 'remember' the environment in which they were created.
5 Concurrency model and Event Loop Advanced, JavaScript
JavaScript has a concurrency model based on an "event loop". This model is quite different from models in other languages like C and Java.
6 Enumerability and ownership of properties JavaScript
Enumerable properties are those properties whose internal [[Enumerable]] flag is set to true, which is the default for properties created via simple assignment or via a property initializer (properties defined via Object.defineProperty and such default [[Enumerable]] to false). Enumerable properties show up in for...in loops unless the property's name is a Symbol. Ownership of properties is determined by whether the property belongs to the object directly and not to its prototype chain. Properties of an object can also be retrieved in total. There are a number of built-in means of detecting, iterating/enumerating, and retrieving object properties, with the chart showing which are available. Some sample code follows which demonstrates how to obtain the missing categories.
7 Equality comparisons and sameness Comparison, Equality, Intermediate, JavaScript, SameValue, SameValueZero, Sameness
Briefly, double equals will perform a type conversion when comparing two things; triple equals will do the same comparison without type conversion (by simply always returning false if the types differ); and Object.is will behave the same way as triple equals, but with special handling for NaN and -0 and +0 so that the last two are not said to be the same, while Object.is(NaN, NaN) will be true. (Comparing NaN with NaN ordinarily—i.e., using either double equals or triple equals—evaluates to false, because IEEE 754 says so.) Do note that the distinction between these all have to do with their handling of primitives; none of them compares whether the parameters are conceptually similar in structure. For any non-primitive objects x and y which have the same structure but are distinct objects themselves, all of the above forms will evaluate to false.
8 Index Index, JavaScript, MDN Meta, MDN meta, index
This page lists all MDN JavaScript pages along with their summary and tags.
9 Inheritance and the prototype chain Inheritance, Intermediate, JavaScript, OOP
JavaScript is a bit confusing for developers experienced in class-based languages (like Java or C++), as it is dynamic and does not provide a class implementation per se (the class keyword is introduced in ES6, but is syntactical sugar, JavaScript remains prototype-based).
10 Introduction to Object-Oriented JavaScript Constructor, Encapsulation, Inheritance, Intermediate, JavaScript, Members, Namespace, OOP, Object, Object-Oriented
Object-oriented to the core, JavaScript features powerful, flexible OOP capabilities. This article starts with an introduction to object-oriented programming, then reviews the JavaScript object model, and finally demonstrates concepts of object-oriented programming in JavaScript. This article does not describe the newer syntax for object-oriented programming in ECMAScript 6.
11 JavaScript Guide Guide, JavaScript, l10n:priority
The JavaScript Guide shows you how to use JavaScript and gives an overview of the language. If you need exhaustive information about a language feature, have a look at the JavaScript reference.
12 Control flow and error handling Beginner, Guide, JavaScript
JavaScript supports a compact set of statements, specifically control flow statements, that you can use to incorporate a great deal of interactivity in your application. This chapter provides an overview of these statements.
13 Details of the object model Guide, Intermediate, JavaScript, Object
JavaScript is an object-based language based on prototypes, rather than being class-based. Because of this different basis, it can be less apparent how JavaScript allows you to create hierarchies of objects and to have inheritance of properties and their values. This chapter attempts to clarify the situation.
14 Expressions and operators Beginner, Expressions, Guide, JavaScript, Operators
This chapter describes JavaScript's expressions and operators, including assignment, comparison, arithmetic, bitwise, logical, string, ternary and more.
15 Functions Beginner, Functions, Guide, JavaScript
Functions are one of the fundamental building blocks in JavaScript. A function is a JavaScript procedure—a set of statements that performs a task or calculates a value. To use a function, you must define it somewhere in the scope from which you wish to call it.
16 Grammar and types Guide, JavaScript
This chapter discusses JavaScript's basic grammar, variable declarations, data types and literals.
17 Indexed collections Guide, JavaScript, Method
This chapter introduces collections of data which are ordered by an index value. This includes arrays and array-like constructs such as Array objects and TypedArray objects.
18 Introduction Guide, JavaScript
This chapter introduces JavaScript and discusses some of its fundamental concepts.
19 Iterators and generators Guide, Intermediate, JavaScript
Processing each of the items in a collection is a very common operation. JavaScript provides a number of ways of iterating over a collection, from simple for loops to map() and filter(). Iterators and Generators bring the concept of iteration directly into the core language and provide a mechanism for customizing the behavior of for...of loops.
20 Keyed collections Collections, Guide, JavaScript, Map, set
This chapter introduces collections of data which are ordered by a key; Map and Set objects contain elements which are iterable in the order of insertion.
21 Loops and iteration Guide, JavaScript, Loop, Syntax
Loops offer a quick and easy way to do something repeatedly. This chapter of the JavaScript Guide introduces the different iteration statements available to JavaScript.
22 Meta programming Guide, JavaScript, Proxy, Reflect
Starting with ECMAScript 6, JavaScript gains support for the Proxy and Reflect objects allowing you to intercept and define custom behavior for fundamental language operations (e.g. property lookup, assignment, enumeration, function invocation, etc). With the help of these two objects you are able to program at the meta level of JavaScript.
23 Numbers and dates Guide, JavaScript
This chapter introduces how to work with numbers and dates in JavaScript.
24 Regular Expressions Guide, Intermediate, JavaScript, Reference, RegExp, Regular Expressions, regex
Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects. These patterns are used with the exec and test methods of RegExp, and with the match, replacesearch, and split methods of String. This chapter describes JavaScript regular expressions.
25 Text formatting Guide, JavaScript
This chapter introduces how to work with strings and text in JavaScript.
26 Working with objects Beginner, Comparing object, Constructor, Document, Guide, JavaScript, Object
JavaScript is designed on a simple object-based paradigm. An object is a collection of properties, and a property is an association between a name (or key) and a value. A property's value can be a function, in which case the property is known as a method. In addition to objects that are predefined in the browser, you can define your own objects. This chapter describes how to use objects, properties, functions, and methods, and how to create your own objects.
27 JavaScript data types and data structures Beginner, JavaScript, Types
Programming languages all have built-in data structures, but these often differ from one language to another. This article attempts to list the built-in data structures available in JavaScript and what properties they have; these can be used to build other data structures. When possible, comparisons with other languages are drawn.
28 JavaScript language resources Advanced, JavaScript
ECMAScript is the scripting language that forms the basis of JavaScript. ECMAScript is standardized by the ECMA International standards organization in the ECMA-262 and ECMA-402 specifications. The following ECMAScript standards have been approved or are being worked on:
29 JavaScript reference JavaScript
This part of the JavaScript section on MDN serves as a repository of facts about the JavaScript language. Read more about this reference.
30 About this reference JavaScript
The JavaScript reference serves as a repository of facts about the JavaScript language. The entire language is described here in detail. As you write JavaScript code, you'll refer to these pages often (thus the title "JavaScript reference"). If you're learning JavaScript, or need help understanding some of its capabilities or features, check out the JavaScript guide.
31 Classes Classes, Constructors, ECMAScript6, Inheritance, Intermediate, JavaScript
JavaScript classes introduced in ECMAScript 6 are syntactical sugar over JavaScript's existing prototype-based inheritance. The class syntax is not introducing a new object-oriented inheritance model to JavaScript. JavaScript classes provide a much simpler and clearer syntax to create objects and deal with inheritance.
32 constructor Classes, ECMAScript6, JavaScript
The constructor method is a special method for creating and initializing an object created with a class.
33 extends Classes, ECMAScript6, JavaScript
The extends keyword is used in a class declarations or class expressions to create a class with a child of another class.
34 static Classes, ECMAScript6, JavaScript
The static keyword defines a static method for a class.
35 Deprecated and obsolete features Deprecated, JavaScript, Obsolete
This page lists features of JavaScript that are deprecated (that is, still available but planned for removal) and obsolete (that is, no longer usable).
36 The legacy Iterator protocol JavaScript, Legacy Iterator
Firefox, prior to version 26 implemented another iterator protocol that is similar to the standard ES2015 Iterator protocol.
37 Expressions and operators JavaScript, Operators
This chapter documents all the JavaScript language operators, expressions and keywords.
38 Arithmetic operators JavaScript, Operator, operator
Arithmetic operators take numerical values (either literals or variables) as their operands and return a single numerical value. The standard arithmetic operators are addition (+), subtraction (-), multiplication (*), and division (/).
39 Array comprehensions JavaScript, Non-Standard, Non-standard, Operator, Reference
The array comprehension syntax is a JavaScript expression which allows you to quickly assemble a new array based on an existing one. Comprehensions exist in many programming languages.
40 Assignment operators JavaScript, Operator
An assignment operator assigns a value to its left operand based on the value of its right operand.
41 Bitwise operators JavaScript, Operator, Reference
Bitwise operators treat their operands as a sequence of 32 bits (zeroes and ones), rather than as decimal, hexadecimal, or octal numbers. For example, the decimal number nine has a binary representation of 1001. Bitwise operators perform their operations on such binary representations, but they return standard JavaScript numerical values.
42 Comma operator JavaScript, Operator, operator
The comma operator evaluates each of its operands (from left to right) and returns the value of the last operand.
43 Comparison operators JavaScript, Operator, Reference
JavaScript has both strict and type–converting comparisons. A strict comparison (e.g., ===) is only true if the operands are of the same type and the contents match. The more commonly-used abstract comparison (e.g. ==) converts the operands to the same type before making the comparison. For relational abstract comparisons (e.g., <=), the operands are first converted to primitives, then to the same type, before comparison.
44 Conditional (ternary) Operator JavaScript, Operator, operator
The conditional (ternary) operator is the only JavaScript operator that takes three operands. This operator is frequently used as a shortcut for the if statement.
45 Destructuring assignment Destructuring, ECMAScript6, JavaScript, Operator
The destructuring assignment syntax is a JavaScript expression that makes it possible to extract data from arrays or objects into distinct variables.
46 Expression closures Functions, JavaScript, Reference
Expression closures are a shorthand function syntax for writing simple functions.
47 Generator comprehensions Iterator, JavaScript, Non-standard, Reference
The generator comprehension syntax is a JavaScript expression which allows you to quickly assemble a new generator function based on an existing iterable object. Comprehensions exist in many programming languages.
48 Grouping operator JavaScript, Operator, Primary Expressions, operator
The grouping operator ( ) controls the precedence of evaluation in expressions.
49 Legacy generator function expression JavaScript, Legacy Iterator, Reference, Référence
The function keyword can be used to define a legacy generator function inside an expression. To make the function a legacy generator, the function body should contain at least one yield expression.
50 Logical Operators JavaScript, Logic, Logical Operators, Not, Operator, Reference, and, or
Logical operators are typically used with Boolean (logical) values. When they are, they return a Boolean value. However, the && and || operators actually return the value of one of the specified operands, so if these operators are used with non-Boolean values, they may return a non-Boolean value.
51 Object initializer ECMAScript 2015, ECMAScript6, JSON, JavaScript, Literal, Methods, Object, Primary Expression, computed, mutation, properties
Objects can be initialized using new Object(), Object.create(), or using the literal notation (initializer notation). An object initializer is a list of zero or more pairs of property names and associated values of an object, enclosed in curly braces ({}).
52 Operator precedence JavaScript, Operator, precedence
Operator precedence determines the order in which operators are evaluated. Operators with higher precedence are evaluated first.
53 Property accessors JavaScript, Operator, operator
Property accessors provide access to an object's properties by using the dot notation or the bracket notation.
54 Spread syntax ECMAScript6, Iterator, JavaScript, Operator
The spread syntax allows an expression to be expanded in places where multiple arguments (for function calls) or multiple elements (for array literals) or multiple variables  (for destructuring assignment) are expected.
55 async function expression Experimental, Function, JavaScript, Operator, Primary Expression, operator
The async function keyword can be used to define a async function inside an expression.
56 await Experimental, JavaScript, Operator
The await operator is used to wait for a promise returned by an async function.
57 class expression Classes, ECMAScript6, Expression, JavaScript, Operator, Reference, operator
The class expression is one way to define a class in ECMAScript 2015 (ES6). Similar to function expressions, class expressions can be named or unnamed. If named, the name of the class is local to the class body only. JavaScript classes are using prototype-based inheritance.
58 delete operator JavaScript, Operator, Reference, Unary
The delete operator removes a property from an object.
59 function expression Function, JavaScript, Operator, Primary Expressions, operator
The function keyword can be used to define a function inside an expression.
60 function* expression ECMAScript6, Function, Iterator, JavaScript, Operator, Primary Expression
The function* keyword can be used to define a generator function inside an expression.
61 in operator JavaScript, Operator, Relational Operators, operator
The in operator returns true if the specified property is in the specified object.
62 instanceof JavaScript, Object, Operator, Prototype, Relational Operators, instanceof, operator
The instanceof operator tests whether an object has in its prototype chain the prototype property of a constructor.
63 new operator JavaScript, Left-hand-side expressions, Operator
The new operator creates an instance of a user-defined object type or of one of the built-in object types that has a constructor function.
64 new.target Classes, ECMAScript6, JavaScript, Reference
The new.target property lets you detect whether a function or constructor was called using the new operator. In constructors and functions instantiated with the new operator, new.target returns a reference to the constructor or function. In normal function calls, new.target is undefined.
65 super Classes, ECMAScript6, JavaScript, Left-hand-side expressions, Operator, operator
The super keyword is used to call functions on an object's parent.
66 this JavaScript, Operator, Primary Expressions, Reference
A function's this keyword behaves a little differently in JavaScript compared to other languages. It also has some differences between strict mode and non-strict mode.
67 typeof JavaScript, Operator, Unary
The typeof operator returns a string indicating the type of the unevaluated operand.
68 void operator JavaScript, Operator, Unary, operator
The void operator evaluates the given expression and then returns undefined.
69 yield ECMAScript6, Generators, Iterator, JavaScript, Operator, operator
The yield keyword is used to pause and resume a generator function (function* or legacy generator function).
70 yield* ECMAScript6, Generators, Iterable, Iterator, JavaScript, Operator, Reference, operator
The yield* expression is used to delegate to another generator or iterable object.
71 Functions Function, Functions, JavaScript
Generally speaking, a function is a "subprogram" that can be called by code external (or internal in the case of recursion) to the function. Like the program itself, a function is composed of a sequence of statements called the function body. Values can be passed to a function, and the function will return a value.
72 Arguments object Functions, JavaScript, arguments
The arguments object is an Array-like object corresponding to the arguments passed to a function.
73 arguments.callee Deprecated, Functions, JavaScript, Property, arguments
The arguments.callee property contains the currently executing function.
74 arguments.caller Functions, JavaScript, Obsolete, Property, arguments
The obsolete arguments.caller property used to provide the function that invoked the currently executing function. This property has been removed and no longer works.
75 arguments.length Functions, JavaScript, Property, arguments
The arguments.length property contains the number of arguments passed to the function.
76 arguments[@@iterator]() Deprecated, Functions, JavaScript, Property, arguments
The initial value of the @@iterator property is the same function object as the initial value of the Array.prototype.values property.
77 Arrow functions ECMAScript6, Functions, Intermediate, JavaScript, Reference
An arrow function expression has a shorter syntax compared to function expressions and does not bind its own thisargumentssuper, or new.target. Arrow functions are always anonymous. These function expressions are best suited for non-method functions and they can not be used as constructors.
78 Default parameters ECMAScript6, Functions, JavaScript
Default function parameters allow formal parameters to be initialized with default values if no value or undefined is passed.
79 Method definitions ECMAScript6, Functions, JavaScript, Object, Syntax
Starting with ECMAScript 2015 (ES6), a shorter syntax for method definitions on objects initializers is introduced. It is a shorthand for a function assigned to the method's name.
80 Rest parameters Functions, JavaScript, Rest, Rest parameters
The rest parameter syntax allows us to represent an indefinite number of arguments as an array.
81 getter ECMAScript5, ECMAScript6, Functions, JavaScript
The get syntax binds an object property to a function that will be called when that property is looked up.
82 setter ECMAScript5, Functions, JavaScript
The set syntax binds an object property to a function to be called when there is an attempt to set that property.
83 Iteration protocols ECMAScript6, Intermediate, Iterable, Iterator, JavaScript
A couple of additions to ECMAScript 2015 (ES6) aren't new built-ins or syntax, but protocols. These protocols can be implemented by any object respecting some conventions.
84 JavaScript error reference JavaScript
Errors, errors everywhere.
85 Error: Permission denied to access property "x" Error, Errors, JavaScript, Security
Error.
86 InternalError: too much recursion Errors, InternalError, JavaScript
InternalError.
87 RangeError: argument is not a valid code point Errors, JavaScript, RangeError
RangeError
88 RangeError: invalid array length Errors, JavaScript, RangeError
RangeError
89 RangeError: precision is out of range Errors, JavaScript, RangeError
RangeError
90 RangeError: radix must be an integer Errors, JavaScript, RangeError
RangeError
91 RangeError: repeat count must be less than infinity Errors, JavaScript, RangeError
RangeError
92 RangeError: repeat count must be non-negative Errors, JavaScript, RangeError
RangeError
93 ReferenceError: "x" is not defined Error, JavaScript, ReferenceError
ReferenceError.
94 ReferenceError: assignment to undeclared variable "x" Errors, JavaScript, ReferenceError, Strict Mode
ReferenceError warning in strict mode only.
95 ReferenceError: deprecated caller or arguments usage Errors, JavaScript, Strict Mode, Warning
A strict-mode-only warning that a ReferenceError occurred. JavaScript execution won't be halted.
96 ReferenceError: invalid assignment left-hand side Errors, JavaScript, ReferenceError
ReferenceError.
97 ReferenceError: reference to undefined property "x" Errors, JavaScript, ReferenceError, Strict Mode
ReferenceError warning in strict mode only.
98 SyntaxError: "use strict" not allowed in function with non-simple parameters Errors, JavaScript, TypeError
SyntaxError.
99 SyntaxError: "x" is not a legal ECMA-262 octal constant Errors, JavaScript, Strict Mode, SyntaxError, Warning
SyntaxError warning in strict mode only.
100 SyntaxError: JSON.parse: bad parsing Errors, JSON, JavaScript, Method, Property, SyntaxError
SyntaxError
101 SyntaxError: Malformed formal parameter Errors, JavaScript, SyntaxError
SyntaxError
102 SyntaxError: Unexpected token Errors, JavaScript, SyntaxError
SyntaxError
103 SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead Errors, JavaScript, Source maps
A warning that a SyntaxError occurred. JavaScript execution won't be halted.
104 SyntaxError: missing ) after argument list Errors, JavaScript, SyntaxError
SyntaxError.
105 SyntaxError: missing ; before statement Errors, JavaScript, SyntaxError
SyntaxError.
106 SyntaxError: missing ] after element list Errors, JavaScript, SyntaxError
SyntaxError.
107 SyntaxError: missing } after property list Errors, JavaScript, SyntaxError
SyntaxError
108 SyntaxError: redeclaration of formal parameter "x" Errors, JavaScript, SyntaxError
SyntaxError
109 SyntaxError: return not in function Errors, JavaScript, SyntaxError
SyntaxError.
110 SyntaxError: test for equality (==) mistyped as assignment (=)? Errors, JavaScript, SyntaxError
SyntaxError warning in strict mode only.
111 SyntaxError: unterminated string literal Errors, JavaScript, SyntaxError
SyntaxError
112 TypeError: "x" has no properties Errors, JavaScript, TypeError
TypeError.
113 TypeError: "x" is (not) "y" Errors, JavaScript, TypeError
TypeError.
114 TypeError: "x" is not a constructor Errors, JavaScript, TypeError
TypeError
115 TypeError: "x" is not a function Errors, JavaScript, TypeError
TypeError.
116 TypeError: "x" is read-only Errors, JavaScript, TypeError
TypeError
117 TypeError: More arguments needed Errors, JavaScript, TypeError
TypeError.
118 TypeError: invalid Array.prototype.sort argument Errors, JavaScript, TypeError
TypeError
119 TypeError: property "x" is non-configurable and can't be deleted Errors, JavaScript, Strict Mode, TypeError
TypeError in strict mode only.
120 TypeError: variable "x" redeclares argument Errors, JavaScript, Strict Mode, TypeError
TypeError warning in strict mode only.
121 Warning: -file- is being assigned a //# sourceMappingURL, but already has one Errors, JavaScript, Source maps, Warning
A warning. JavaScript execution won't be halted.
122 Warning: JavaScript 1.6's for-each-in loops are deprecated JavaScript, Warning
Warning
123 Warning: unreachable code after return statement JavaScript, Warning
Warning
124 JavaScript methods index JavaScript
This article entails a listing of all JavaScript methods documented on MDN sorted alphabetically.
125 JavaScript properties index JavaScript
This article entails a listing of all JavaScript properties documented on MDN sorted alphabetically.
126 Lexical grammar JavaScript, Keyword, Lexical Grammar, Literal
This page describes JavaScript's lexical grammar. The source text of ECMAScript scripts gets scanned from left to right and is converted into a sequence of input elements which are tokens, control characters, line terminators, comments or white space. ECMAScript also defines certain keywords and literals and has rules for automatic insertion of semicolons to end statements.
127 Standard built-in objects JavaScript, Reference, Référence
This chapter documents all of JavaScript's standard, built-in objects, including their methods and properties.
128 Array Array, Example, Global Objects, JavaScript, Reference
The JavaScript Array object is a global object that is used in the construction of arrays; which are high-level, list-like objects.
129 Array.from() Array, ECMAScript6, JavaScript, Method, polyfill
The Array.from() method creates a new Array instance from an array-like or iterable object.
130 Array.isArray() Array, ECMAScript5, JavaScript, Method, polyfill
The Array.isArray() determines whether the passed value is an Array.
131 Array.observe() Array, JavaScript, Method, Obsolete
The Array.observe() method was used for asynchronously observing changes to Arrays, similar to Object.observe() for objects. It provided a stream of changes in order of occurrence. It's equivalent to Object.observe() invoked with the accept type list ["add", "update", "delete", "splice"]. However, this API has been deprecated and removed from Browsers. You can use the more general Proxy object instead.
132 Array.of() Array, ECMAScript6, JavaScript, Method, polyfill
The Array.of() method creates a new Array instance with a variable number of arguments, regardless of number or type of the arguments.
133 Array.prototype Array, JavaScript, Property
The Array.prototype property represents the prototype for the Array constructor and allows you to add new properties and methods to all Array objects.
134 Array.prototype.concat() Array, JavaScript, Method, Prototype
The concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.
135 Array.prototype.copyWithin() Array, ECMAScript6, JavaScript, Method, Prototype, polyfill
The copyWithin() method shallow copies part of an array to another location in the same array and returns it, without modifying its size.
136 Array.prototype.entries() Array, ECMAScript6, Iterator, JavaScript, Method, Prototype
The entries() method returns a new Array Iterator object that contains the key/value pairs for each index in the array.
137 Array.prototype.every() Array, ECMAScript5, JavaScript, Method, Prototype, polyfill
The every() method tests whether all elements in the array pass the test implemented by the provided function.
138 Array.prototype.fill() Array, ECMAScript6, JavaScript, Method, Prototype, polyfill
The fill() method fills all the elements of an array from a start index to an end index with a static value.
139 Array.prototype.filter() Array, ECMAScript5, JavaScript, Method, Prototype, Reference, polyfill
The filter() method creates a new array with all elements that pass the test implemented by the provided function.
140 Array.prototype.find() Array, ECMAScript 2015, ECMAScript6, JavaScript, Method, Prototype, polyfill
The find() method returns a value of the first element in the array that satisfies the provided testing function. Otherwise undefined is returned.
141 Array.prototype.findIndex() Array, ECMAScript6, JavaScript, Method, Prototype, polyfill
The findIndex() method returns an index of the first element in the array that satisfies the provided testing function. Otherwise -1 is returned.
142 Array.prototype.forEach() Array, ECMAScript5, JavaScript, Method, Prototype, Reference
The forEach() method executes a provided function once per array element.
143 Array.prototype.includes() Array, JavaScript, Method, Prototype, Reference, polyfill
The includes() method determines whether an array includes a certain element, returning true or false as appropriate.
144 Array.prototype.indexOf() Array, JavaScript, Method, Prototype, Reference, polyfill
The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
145 Array.prototype.join() Array, JavaScript, Method, Prototype, Reference
The join() method joins all elements of an array into a string.
146 Array.prototype.keys() Array, ECMAScript6, Iterator, JavaScript, Method, Prototype
The keys() method returns a new Array Iterator that contains the keys for each index in the array.
147 Array.prototype.lastIndexOf() Array, ECMAScript5, JavaScript, Method, Prototype, polyfill
The lastIndexOf() method returns the last index at which a given element can be found in the array, or -1 if it is not present. The array is searched backwards, starting at fromIndex.
148 Array.prototype.map() Array, ECMAScript5, JavaScript, Method, Prototype, polyfill
The map() method creates a new array with the results of calling a provided function on every element in this array.
149 Array.prototype.pop() Array, JavaScript, Method, Prototype
The pop() method removes the last element from an array and returns that element. This method changes the length of the array.
150 Array.prototype.push() Array, JavaScript, Method, Prototype, Reference
The push() method adds one or more elements to the end of an array and returns the new length of the array.
151 Array.prototype.reduce() Array, ECMAScript5, JavaScript, Method, Prototype
The reduce() method applies a function against an accumulator and each value of the array (from left-to-right) to reduce it to a single value.
152 Array.prototype.reduceRight() Array, ECMAScript5, JavaScript, Method, Prototype, polyfill
The reduceRight() method applies a function against an accumulator and each value of the array (from right-to-left) has to reduce it to a single value.
153 Array.prototype.reverse() Array, JavaScript, Method, Prototype
The reverse() method reverses an array in place. The first array element becomes the last, and the last array element becomes the first.
154 Array.prototype.shift() Array, JavaScript, Method, Prototype
The shift() method removes the first element from an array and returns that element. This method changes the length of the array.
155 Array.prototype.slice() Array, JavaScript, Method, Prototype
The slice() method returns a shallow copy of a portion of an array into a new array object selected from begin to end (end not included). The original array will not be modified.
156 Array.prototype.some() Array, ECMAScript5, JavaScript, Method, Prototype, Reference
The some() method tests whether some element in the array passes the test implemented by the provided function.
157 Array.prototype.sort() Array, JavaScript, Method, Prototype
The sort() method sorts the elements of an array in place and returns the array. The sort is not necessarily stable. The default sort order is according to string Unicode code points.
158 Array.prototype.splice() Array, JavaScript, Method, Prototype, Reference
The splice() method changes the content of an array by removing existing elements and/or adding new elements.
159 Array.prototype.toLocaleString() Array, Internationalization, JavaScript, Method, Prototype
The toLocaleString() method returns a string representing the elements of the array. The elements are converted to Strings using their toLocaleString methods and these Strings are separated by a locale-specific String (such as a comma “,”).
160 Array.prototype.toSource() Array, JavaScript, Method, Prototype, prototype
The toSource() method returns a string representing the source code of the array.
161 Array.prototype.toString() Array, JavaScript, Method, Prototype
The toString() method returns a string representing the specified array and its elements.
162 Array.prototype.unshift() Array, JavaScript, Method, Prototype
The unshift() method adds one or more elements to the beginning of an array and returns the new length of the array.
163 Array.prototype.values() Array, ECMAScript6, Iterator, JavaScript, Method, Prototype
The values() method returns a new Array Iterator object that contains the values for each index in the array.
164 Array.prototype[@@iterator]() Array, ECMAScript6, Iterator, JavaScript, Method, Prototype, Reference
The initial value of the @@iterator property is the same function object as the initial value of the values() property.
165 Array.prototype[@@unscopables] Array, ECMAScript6, JavaScript, Property, Prototype
The @@unscopable symbol property contains property names that were not included in the ECMAScript standard prior to the ES2015 (ES6) version. These properties are excluded from with statement bindings.
166 Array.unobserve() Array, JavaScript, Method, Obsolete
The Array.unobserve() method was used to remove observers set by Array.observe(), but has been deprecated and removed from Browsers. You can use the more general Proxy object instead.
167 array.length Array, JavaScript, Property
The array length property sets or returns the number of elements in an array. It represents an unsigned, 32-bit integer that is always numerically greater than the highest index in the array.
168 get Array[@@species] Array, JavaScript, Method, Prototype, prototype
The Array[@@species] accessor property returns the Array constructor.
169 ArrayBuffer ArrayBuffer, Constructor, JavaScript, TypedArrays
The ArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer. You cannot directly manipulate the contents of an ArrayBuffer; instead, you create one of the typed array objects or a DataView object which represents the buffer in a specific format, and use that to read and write the contents of the buffer.
170 ArrayBuffer.isView() ArrayBuffer, JavaScript, Method, TypedArrays
The ArrayBuffer.isView() method returns true if arg is one of the ArrayBuffer views, such as typed array objects or a DataView; false otherwise.
171 ArrayBuffer.prototype ArrayBuffer, JavaScript, Property
The ArrayBuffer.prototype property represents the prototype for the ArrayBuffer object.
172 ArrayBuffer.prototype.byteLength ArrayBuffer, JavaScript, Property, Prototype, prototype
The byteLength accessor property represents the length of an ArrayBuffer in bytes.
173 ArrayBuffer.prototype.slice() ArrayBuffer, JavaScript, Method, Prototype, prototype
The slice() method returns a new ArrayBuffer whose contents are a copy of this ArrayBuffer's bytes from begin, inclusive, up to end, exclusive.
174 ArrayBuffer.transfer() ArrayBuffer, Experimental, JavaScript, Method, Reference, TypedArrays
The static ArrayBuffer.transfer() method returns a new ArrayBuffer whose contents have been taken from the oldBuffer's data and then is either truncated or zero-extended by newByteLength. If newByteLength is undefined, the byteLength of the oldBuffer is used. This operation leaves oldBuffer in a detached state.
175 get ArrayBuffer[@@species] ArrayBuffer, JavaScript, Property, TypedArrays
The ArrayBuffer[@@species] accessor property returns the ArrayBuffer constructor.
176 AsyncFunction Constructor, Experimental, JavaScript, Reference
The AsyncFunction constructor creates a new async function object. In JavaScript every async function is actually a AsyncFunction object.
177 AsyncFunction.prototype Experimental, JavaScript, Property, Prototype, Reference
The AsyncFunction.prototype property represents the AsyncFunction prototype object.
178 Atomics Atomics, Experimental, JavaScript, Shared Memory, Specifications
The Atomics object provides atomic operations as static methods. They are used with SharedArrayBuffer objects.
179 Atomics.add() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.add() method adds a given value at a given position in the array and returns the old value at that position. This atomic operation guarantees that no other write happens until the modified value is written back.
180 Atomics.and() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.and() method computes a bitwise AND with a given value at a given position in the array, and returns the old value at that position. This atomic operation guarantees that no other write happens until the modified value is written back.
181 Atomics.compareExchange() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.compareExchange() method exchanges a given replacement value at a given position in the array, and returns the old value at that position, if a given expected value equals the old value. This atomic operation guarantees that no other write happens until the modified value is written back.
182 Atomics.exchange() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.exchange() method exchanges a given value at a given position in the array and returns the old value at that position. This atomic operation guarantees that no other write happens until the modified value is written back.
183 Atomics.isLockFree() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.isLockFree() method is used to determine whether to use locks or atomic operations. It returns true, if the given size is one of the BYTES_PER_ELEMENT property of integer TypedArray types.
184 Atomics.load() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.load() method returns a value at a given position in the array. This atomic operation guarantees that no other read happens until the modified value is read back.
185 Atomics.or() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.or() method computes a bitwise OR with a given value at a given position in the array, and returns the old value at that position. This atomic operation guarantees that no other write happens until the modified value is written back.
186 Atomics.store() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.store() method stores a given value at the given position in the array and returns that value. This atomic operation guarantees that no other write happens until the modified value is written back.
187 Atomics.sub() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.sub() method substracts a given value at a given position in the array and returns the old value at that position. This atomic operation guarantees that no other write happens until the modified value is written back.
188 Atomics.wait() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.wait() method verifies that a given position in an Int32Array still contains a given value and sleeps awaiting or times out. It returns a string which is either "ok", "not-equal", or "timed-out".
189 Atomics.wake() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.wake() method wakes up some agents that are sleeping in the wait queue.
190 Atomics.xor() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.xor() method computes a bitwise XOR with a given value at a given position in the array, and returns the old value at that position. This atomic operation guarantees that no other write happens until the modified value is written back.
191 Boolean Boolean, Constructor, JavaScript
The Boolean object is an object wrapper for a boolean value.
192 Boolean.prototype Boolean, JavaScript, Property, Prototype
The Boolean.prototype property represents the prototype for the Boolean constructor.
193 Boolean.prototype.toSource() Boolean, JavaScript, Method, Prototype
The toSource() method returns a string representing the source code of the object.
194 Boolean.prototype.toString() Boolean, JavaScript, Method, Prototype
The toString() method returns a string representing the specified Boolean object.
195 Boolean.prototype.valueOf() Boolean, JavaScript, Method, Prototype
The valueOf() method returns the primitive value of a Boolean object.
196 DataView Constructor, DataView, JavaScript, TypedArrays
The DataView view provides a low-level interface for reading and writing multiple number types in an ArrayBuffer irrespective of the platform's endianness.
197 DataView.prototype DataView, JavaScript, Property
The DataView.prototype property represents the prototype for the DataView object.
198 DataView.prototype.buffer DataView, JavaScript, Property, Prototype, TypedArrays, prototype
The buffer accessor property represents the ArrayBuffer referenced by the DataView at construction time.
199 DataView.prototype.byteLength DataView, JavaScript, Property, Prototype, TypedArrays, prototype
The byteLength accessor property represents the length (in bytes) of this view from the start of its ArrayBuffer.
200 DataView.prototype.byteOffset DataView, JavaScript, Property, Prototype, TypedArrays, prototype
The byteOffset accessor property represents the offset (in bytes) of this view from the start of its ArrayBuffer.
201 DataView.prototype.getFloat32() DataView, JavaScript, Method, Prototype, TypedArrays
The getFloat32() method gets a signed 32-bit float (float) at the specified byte offset from the start of the DataView.
202 DataView.prototype.getFloat64() DataView, JavaScript, Method, Prototype, TypedArrays
The getFloat64() method gets a signed 64-bit float (double) at the specified byte offset from the start of the DataView.
203 DataView.prototype.getInt16() DataView, JavaScript, Method, Prototype, TypedArrays
The getInt16() method gets a signed 16-bit integer (short) at the specified byte offset from the start of the DataView.
204 DataView.prototype.getInt32() DataView, JavaScript, Method, Prototype, TypedArrays
The getInt32() method gets a signed 32-bit integer (long) at the specified byte offset from the start of the DataView.
205 DataView.prototype.getInt8() DataView, JavaScript, Method, Prototype, TypedArrays
The getInt8() method gets a signed 8-bit integer (byte) at the specified byte offset from the start of the DataView.
206 DataView.prototype.getUint16() DataView, JavaScript, Method, Prototype, TypedArrays
The getUint16() method gets an unsigned 16-bit integer (unsigned short) at the specified byte offset from the start of the DataView.
207 DataView.prototype.getUint32() DataView, JavaScript, Method, Prototype, TypedArrays
The getUint32() method gets an unsigned 32-bit integer (unsigned long) at the specified byte offset from the start of the DataView.
208 DataView.prototype.getUint8() DataView, JavaScript, Method, Prototype, TypedArrays
The getUint8() method gets an unsigned 8-bit integer (unsigned byte) at the specified byte offset from the start of the DataView.
209 DataView.prototype.setFloat32() DataView, JavaScript, Method, Prototype, TypedArrays
The setFloat32() method stores a signed 32-bit float (float) value at the specified byte offset from the start of the DataView.
210 DataView.prototype.setFloat64() DataView, JavaScript, Method, Prototype, TypedArrays
The setFloat64() method stores a signed 64-bit float (double) value at the specified byte offset from the start of the DataView.
211 DataView.prototype.setInt16() DataView, JavaScript, Method, Prototype, TypedArrays
The setInt16() method stores a signed 16-bit integer (short) value at the specified byte offset from the start of the DataView.
212 DataView.prototype.setInt32() DataView, JavaScript, Method, Prototype, TypedArrays
The setInt32() method stores a signed 32-bit integer (long) value at the specified byte offset from the start of the DataView.
213 DataView.prototype.setInt8() DataView, JavaScript, Method, Prototype, TypedArrays
The setInt8() method stores a signed 8-bit integer (byte) value at the specified byte offset from the start of the DataView.
214 DataView.prototype.setUint16() DataView, JavaScript, Method, Prototype, TypedArrays
The setUint16() method stores an unsigned 16-bit integer (unsigned short) value at the specified byte offset from the start of the DataView.
215 DataView.prototype.setUint32() DataView, JavaScript, Method, Prototype, TypedArrays
The setUint32() method stores an unsigned 32-bit integer (unsigned long) value at the specified byte offset from the start of the DataView.
216 DataView.prototype.setUint8() DataView, JavaScript, Method, Prototype, TypedArrays
The setUint8() method stores an unsigned 8-bit integer (byte) value at the specified byte offset from the start of the DataView.
217 Date Date, JavaScript
Creates a JavaScript Date instance that represents a single moment in time. Date objects are based on a time value that is the number of milliseconds since 1 January, 1970 UTC.
218 Date.UTC() Date, JavaScript, Method, Reference
The Date.UTC() method accepts the same parameters as the longest form of the constructor, and returns the number of milliseconds in a Date object since January 1, 1970, 00:00:00, universal time.
219 Date.now() Date, JavaScript, Method, Reference, polyfill
The Date.now() method returns the number of milliseconds elapsed since 1 January 1970 00:00:00 UTC.
220 Date.parse() Date, JavaScript, Method, Reference
The Date.parse() method parses a string representation of a date, and returns the number of milliseconds since January 1, 1970, 00:00:00 UTC or NaN if the string is unrecognised or, in some cases, contains illegal date values (e.g. 2015-02-31).
221 Date.prototype Date, JavaScript, Property, Prototype, Reference
The Date.prototype property represents the prototype for the Date constructor.
222 Date.prototype.getDate() Date, JavaScript, Method, Prototype, Reference
The getDate() method returns the day of the month for the specified date according to local time.
223 Date.prototype.getDay() Date, JavaScript, Method, Prototype, Reference
The getDay() method returns the day of the week for the specified date according to local time, where 0 represents Sunday.
224 Date.prototype.getFullYear() Date, JavaScript, Method, Prototype, Reference
The getFullYear() method returns the year of the specified date according to local time.
225 Date.prototype.getHours() Date, JavaScript, Method, Prototype, Reference
The getHours() method returns the hour for the specified date, according to local time.
226 Date.prototype.getMilliseconds() Date, JavaScript, Method, Prototype, Reference
The getMilliseconds() method returns the milliseconds in the specified date according to local time.
227 Date.prototype.getMinutes() Date, JavaScript, Method, Prototype, Reference
The getMinutes() method returns the minutes in the specified date according to local time.
228 Date.prototype.getMonth() Date, JavaScript, Method, Prototype, Reference
The getMonth() method returns the month in the specified date according to local time, as a zero-based value (where zero indicates the first month of the year).
229 Date.prototype.getSeconds() Date, JavaScript, Method, Prototype, Reference
The getSeconds() method returns the seconds in the specified date according to local time.
230 Date.prototype.getTime() Date, JavaScript, Method, Prototype, Reference, Référence
The getTime() method returns the numeric value corresponding to the time for the specified date according to universal time.
231 Date.prototype.getTimezoneOffset() Date, JavaScript, Method, Prototype, Reference
The getTimezoneOffset() method returns the time zone offset from UTC, in minutes, for the current locale (i.e. host system settings).
232 Date.prototype.getUTCDate() Date, JavaScript, Method, Prototype, Reference
The getUTCDate() method returns the day (date) of the month in the specified date according to universal time.
233 Date.prototype.getUTCDay() Date, JavaScript, Method, Prototype, Reference
The getUTCDay() method returns the day of the week in the specified date according to universal time, where 0 represents Sunday.
234 Date.prototype.getUTCFullYear() Date, JavaScript, Method, Prototype, Reference
The getUTCFullYear() method returns the year in the specified date according to universal time.
235 Date.prototype.getUTCHours() Date, JavaScript, Method, Prototype, Reference
The getUTCHours() method returns the hours in the specified date according to universal time.
236 Date.prototype.getUTCMilliseconds() Date, JavaScript, Method, Prototype, Reference
The getUTCMilliseconds() method returns the milliseconds in the specified date according to universal time.
237 Date.prototype.getUTCMinutes() Date, JavaScript, Method, Prototype, Reference
The getUTCMinutes() method returns the minutes in the specified date according to universal time.
238 Date.prototype.getUTCMonth() Date, JavaScript, Method, Prototype, Reference
The getUTCMonth() returns the month of the specified date according to universal time, as a zero-based value (where zero indicates the first month of the year).
239 Date.prototype.getUTCSeconds() Date, JavaScript, Method, Prototype, Reference
The getUTCSeconds() method returns the seconds in the specified date according to universal time.
240 Date.prototype.getYear() Date, Deprecated, JavaScript, Method, Prototype, Reference
The getYear() method returns the year in the specified date according to local time. Because getYear() does not return full years ("year 2000 problem"), it is no longer used and has been replaced by the getFullYear() method.
241 Date.prototype.setDate() Date, JavaScript, Method, Prototype, Reference
The setDate() method sets the day of the Date object relative to the beginning of the currently set month.
242 Date.prototype.setFullYear() Date, JavaScript, Method, Prototype, Reference
The setFullYear() method sets the full year for a specified date according to local time. Returns new timestamp.
243 Date.prototype.setHours() Date, JavaScript, Method, Prototype, Reference
The setHours() method sets the hours for a specified date according to local time, and returns the number of milliseconds since 1 January 1970 00:00:00 UTC until the time represented by the updated Date instance.
244 Date.prototype.setMilliseconds() Date, JavaScript, Method, Prototype, Reference
The setMilliseconds() method sets the milliseconds for a specified date according to local time.
245 Date.prototype.setMinutes() Date, JavaScript, Method, Prototype, Reference
The setMinutes() method sets the minutes for a specified date according to local time.
246 Date.prototype.setMonth() Date, JavaScript, Method, Prototype, Reference
The setMonth() method sets the month for a specified date according to the currently set year.
247 Date.prototype.setSeconds() Date, JavaScript, Method, Prototype, Reference
The setSeconds() method sets the seconds for a specified date according to local time.
248 Date.prototype.setTime() Date, JavaScript, Method, Prototype, Reference
The setTime() method sets the Date object to the time represented by a number of milliseconds since January 1, 1970, 00:00:00 UTC.
249 Date.prototype.setUTCDate() Date, JavaScript, Method, Prototype, Reference
The setUTCDate() method sets the day of the month for a specified date according to universal time.
250 Date.prototype.setUTCFullYear() Date, JavaScript, Method, Prototype, Reference
The setUTCFullYear() method sets the full year for a specified date according to universal time.
251 Date.prototype.setUTCHours() Date, JavaScript, Method, Prototype, Reference
The setUTCHours() method sets the hour for a specified date according to universal time, and returns the number of milliseconds since 1 January 1970 00:00:00 UTC until the time represented by the updated Date instance.
252 Date.prototype.setUTCMilliseconds() Date, JavaScript, Method, Prototype, Reference
The setUTCMilliseconds() method sets the milliseconds for a specified date according to universal time.
253 Date.prototype.setUTCMinutes() Date, JavaScript, Method, Prototype, Reference
The setUTCMinutes() method sets the minutes for a specified date according to universal time.
254 Date.prototype.setUTCMonth() Date, JavaScript, Method, Prototype, Reference
The setUTCMonth() method sets the month for a specified date according to universal time.
255 Date.prototype.setUTCSeconds() Date, JavaScript, Method, Prototype, Reference
The setUTCSeconds() method sets the seconds for a specified date according to universal time.
256 Date.prototype.setYear() Date, Deprecated, JavaScript, Method, Prototype, Reference
The setYear() method sets the year for a specified date according to local time. Because setYear() does not set full years ("year 2000 problem"), it is no longer used and has been replaced by the setFullYear() method.
257 Date.prototype.toDateString() Date, JavaScript, Method, Prototype, Reference
The toDateString() method returns the date portion of a Date object in human readable form in American English.
258 Date.prototype.toGMTString() Date, Deprecated, JavaScript, Method, Prototype, Reference
The toGMTString() method converts a date to a string, using Internet Greenwich Mean Time (GMT) conventions. The exact format of the value returned by toGMTString() varies according to the platform and browser, in general it should represent a human readable date string.
259 Date.prototype.toISOString() Date, JavaScript, Method, Prototype, Reference, polyfill
The toISOString() method returns a string in simplified extended ISO format (ISO 8601), which is always 24 or 27 characters long (YYYY-MM-DDTHH:mm:ss.sssZ or ±YYYYYY-MM-DDTHH:mm:ss.sssZ, respectively). The timezone is always zero UTC offset, as denoted by the suffix "Z".
260 Date.prototype.toJSON() Date, JavaScript, Method, Prototype, Reference
The toJSON() method returns a string representation of the Date object.
261 Date.prototype.toLocaleDateString() Date, Internationalization, JavaScript, Method, Prototype, Reference
The toLocaleDateString() method returns a string with a language sensitive representation of the date portion of this date. The new locales and options arguments let applications specify the language whose formatting conventions should be used and allow to customize the behavior of the function. In older implementations, which ignore the locales and options arguments, the locale used and the form of the string returned are entirely implementation dependent.
262 Date.prototype.toLocaleFormat() Date, JavaScript, Method, Prototype, Reference
The non-standard toLocaleFormat() method converts a date to a string using the specified formatting. Intl.DateTimeFormat is an alternative to format dates in a standards-compliant way. See also the newer version of Date.prototype.toLocaleDateString().
263 Date.prototype.toLocaleString() Date, Internationalization, JavaScript, Method, Prototype, Reference
The toLocaleString() method returns a string with a language sensitive representation of this date. The new locales and options arguments let applications specify the language whose formatting conventions should be used and customize the behavior of the function. In older implementations, which ignore the locales and options arguments, the locale used and the form of the string returned are entirely implementation dependent.
264 Date.prototype.toLocaleTimeString() Date, Internationalization, JavaScript, Method, Prototype, Reference
The toLocaleTimeString() method returns a string with a language sensitive representation of the time portion of this date. The new locales and options arguments let applications specify the language whose formatting conventions should be used and customize the behavior of the function. In older implementations, which ignore the locales and options arguments, the locale used and the form of the string returned are entirely implementation dependent.
265 Date.prototype.toSource() Date, JavaScript, Method, Prototype, Reference
The toSource() method returns a string representing the source code of the object.
266 Date.prototype.toString() Date, JavaScript, Method, Prototype, Reference
The toString() method returns a string representing the specified Date object.
267 Date.prototype.toTimeString() Date, JavaScript, Method, Prototype, Reference
The toTimeString() method returns the time portion of a Date object in human readable form in American English.
268 Date.prototype.toUTCString() Date, JavaScript, Method, Prototype, Reference
The toUTCString() method converts a date to a string, using the UTC time zone.
269 Date.prototype.valueOf() Date, JavaScript, Method, Prototype, Reference
The valueOf() method returns the primitive value of a Date object.
270 Date.prototype[@@toPrimitive] Date, JavaScript, Method, Prototype, Reference
The [@@toPrimitive]() method converts a Date object to a primitive value.
271 Error Error, JavaScript, Reference
The Error constructor creates an error object. Instances of Error objects are thrown when runtime errors occur. The Error object can also be used as a base object for user-defined exceptions. See below for standard built-in error types.
272 Error.prototype Error, JavaScript, Property
The Error.prototype property represents the prototype for the Error constructor.
273 Error.prototype.columnNumber Error, JavaScript, Property, Prototype
The columnNumber property contains the column number in the line of the file that raised this error.
274 Error.prototype.fileName Error, JavaScript, Property, Prototype
The fileName property contains the path to the file that raised this error.
275 Error.prototype.lineNumber Error, JavaScript, Property, Prototype, Reference
The lineNumber property contains the line number in the file that raised this error.
276 Error.prototype.message Error, JavaScript, Property, Prototype
The message property is a human-readable description of the error.
277 Error.prototype.name Error, JavaScript, Property, Prototype
The name property represents a name for the type of error. The initial value is "Error".
278 Error.prototype.stack Error, JavaScript, Property, Prototype, Reference
The non-standard stack property of Error objects offer a trace of which functions were called, in what order, from which line and file, and with what arguments. The stack string proceeds from the most recent calls to earlier ones, leading back to the original global scope call.
279 Error.prototype.toSource() Error, JavaScript, Method, Prototype
The toSource() method returns code that could eval to the same error.
280 Error.prototype.toString() Error, JavaScript, Method, Prototype
The toString() method returns a string representing the specified Error object.
281 EvalError Error, EvalError, JavaScript, Reference
The EvalError object indicates an error regarding the global eval() function. This exception is not thrown by JavaScript anymore, however the EvalError object remains for compatibility.
282 EvalError.prototype Error, EvalError, JavaScript, Property
The EvalError.prototype property represents the prototype of the EvalError constructor.
283 Float32Array Constructor, JavaScript, TypedArray, TypedArrays
The Float32Array typed array represents an array of 32-bit floating point numbers (corresponding to the C float data type) in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
284 Float64Array Constructor, JavaScript, TypedArray, TypedArrays
The Float64Array typed array represents an array of 64-bit floating point numbers (corresponding to the C double data type) in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
285 Function Constructor, Function, JavaScript
The Function constructor creates a new Function object. In JavaScript every function is actually a Function object.
286 Function.arguments Deprecated, Function, JavaScript, Property, arguments
The function.arguments property refers to an an array-like object corresponding to the arguments passed to a function. Use the simple variable arguments instead.
287 Function.arity Function, JavaScript, Obsolete, Property, Unimplemented
The arity property used to return the number of arguments expected by the function, however, it no longer exists and has been replaced by the Function.prototype.length property.
288 Function.caller Function, JavaScript, Property
The function.caller property returns the function that invoked the specified function.
289 Function.displayName Function, JavaScript, Property
The function.displayName property returns the display name of the function.
290 Function.length Function, JavaScript, Property
The length property specifies the number of arguments expected by the function.
291 Function.name ECMAScript6, Function, JavaScript, Property
The function.name property returns the name of the function.
292 Function.prototype Function, JavaScript, Property, Prototype
The Function.prototype property represents the Function prototype object.
293 Function.prototype.apply() Function, JavaScript, Method
The apply() method calls a function with a given this value and arguments provided as an array (or an array-like object).
294 Function.prototype.bind() ECMAScript5, ECMAScript6, Function, JavaScript, Method, polyfill
The bind() method creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called.
295 Function.prototype.call() Function, JavaScript, Method
The call() method calls a function with a given this value and arguments provided individually.
296 Function.prototype.isGenerator() Function, JavaScript, Method
The isGenerator() method determines whether or not a function is a generator.
297 Function.prototype.toSource() Function, JavaScript, Method
The toSource() method returns a string representing the source code of the object.
298 Function.prototype.toString() Function, JavaScript, Method, Prototype
The toString() method returns a string representing the source code of the function.
299 Generator ECMAScript6, Generator, JavaScript, Legacy Generator, Legacy Iterator, Reference
The Generator object is returned by a generator function and it conforms to both the iterable protocol and the iterator protocol.
300 Generator.prototype.next() ECMAScript6, Generator, JavaScript, Method, Prototype, Reference
The next() method returns an object with two properties done and value. You can also provide a parameter to the next method to send a value to the generator.
301 Generator.prototype.return() ECMAScript6, Generator, JavaScript, Method, Prototype, Reference
The return() method returns the given value and finishes the generator.
302 Generator.prototype.throw() ECMAScript6, Generator, JavaScript, Method, Prototype, Reference
The throw() method resumes the execution of a generator by throwing an error into it and returns an object with two properties done and value.
303 GeneratorFunction Constructor, ECMAScript6, GeneratorFunction, Iterator, JavaScript, Reference
The GeneratorFunction constructor creates a new generator function object. In JavaScript every generator function is actually a GeneratorFunction object.
304 GeneratorFunction.prototype ECMAScript6, GeneratorFunction, Iterator, JavaScript, Property, Prototype, Reference, prototype
The GeneratorFunction.prototype property represents the GeneratorFunction prototype object.
305 Infinity JavaScript
The global Infinity property is a numeric value representing infinity.
306 Int16Array Constructor, JavaScript, TypedArray, TypedArrays
The Int16Array typed array represents an array of twos-complement 16-bit signed integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
307 Int32Array Constructor, JavaScript, TypedArray, TypedArrays
The Int32Array typed array represents an array of twos-complement 32-bit signed integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
308 Int8Array Constructor, Int8Array, JavaScript, TypedArray, TypedArrays
The Int8Array typed array represents an array of twos-complement 8-bit signed integers. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
309 InternalError Error, InternalError, JavaScript
The InternalError object indicates an error that occurred internally in the JavaScript engine. For example: "InternalError: too much recursion".
310 InternalError.prototype Error, InternalError, JavaScript, Property
The InternalError.prototype property represents the prototype of the InternalError constructor.
311 Intl Internationalization, JavaScript
The Intl object is the namespace for the ECMAScript Internationalization API, which provides language sensitive string comparison, number formatting, and date and time formatting. The constructors for Collator, NumberFormat, and DateTimeFormat objects are properties of the Intl object. This page documents these properties as well as functionality common to the internationalization constructors and other language sensitive functions.
312 Intl.getCanonicalLocales() Internationalization, Intl, JavaScript, Method
The Intl.getCanonicalLocales() method returns an array containing the canonical locale names. Duplicates will be omitted and elements will be validated as structurally valid language tags.
313 Intl.Collator Collator, Internationalization, JavaScript
The Intl.Collator object is a constructor for collators, objects that enable language sensitive string comparison.
314 Intl.Collator.prototype Collator, Internationalization, JavaScript, Property, Prototype, prototype
The Intl.Collator.prototype property represents the prototype object for the Intl.Collator constructor.
315 Intl.Collator.prototype.compare Collator, Internationalization, JavaScript, Property, Prototype, prototype
The Intl.Collator.prototype.compare property returns a getter function that compares two strings according to the sort order of this Collator object.
316 Intl.Collator.prototype.resolvedOptions() Collator, Internationalization, JavaScript, Method, Prototype
The Intl.Collator.prototype.resolvedOptions() method returns a new object with properties reflecting the locale and collation options computed during initialization of this Collator object.
317 Intl.Collator.supportedLocalesOf() Collator, Internationalization, JavaScript, Method
The Intl.Collator.supportedLocalesOf() method returns an array containing those of the provided locales that are supported in collation without having to fall back to the runtime's default locale.
318 Intl.DateTimeFormat DateTimeFormat, Internationalization, JavaScript
The Intl.DateTimeFormat object is a constructor for objects that enable language sensitive date and time formatting.
319 Intl.DateTimeFormat.prototype DateTimeFormat, Internationalization, JavaScript, Property, Prototype, prototype
The Intl.DateTimeFormat.prototype property represents the prototype object for the Intl.DateTimeFormat constructor.
320 Intl.DateTimeFormat.prototype.format DateTimeFormat, Internationalization, JavaScript, Property, Prototype
The Intl.DateTimeFormat.prototype.format property returns a getter function that formats a date according to the locale and formatting options of this Intl.DateTimeFormat object.
321 Intl.DateTimeFormat.prototype.formatToParts() DateTimeFormat, Internationalization, Intl, JavaScript, Method, Prototype
The Intl.DateTimeFormat.prototype.formatToParts() method allows locale-aware formatting of strings produced by DateTimeFormat formatters.
322 Intl.DateTimeFormat.prototype.resolvedOptions() DateTimeFormat, Internationalization, JavaScript, Method, Prototype
The Intl.DateTimeFormat.prototype.resolvedOptions() method returns a new object with properties reflecting the locale and date and time formatting options computed during initialization of this DateTimeFormat object.
323 Intl.DateTimeFormat.supportedLocalesOf() DateTimeFormat, Internationalization, JavaScript, Method, Prototype
The Intl.DateTimeFormat.supportedLocalesOf() method returns an array containing those of the provided locales that are supported in date and time formatting without having to fall back to the runtime's default locale.
324 Intl.NumberFormat Internationalization, JavaScript, NumberFormat
The Intl.NumberFormat object is a constructor for objects that enable language sensitive number formatting.
325 Intl.NumberFormat.prototype Internationalization, JavaScript, NumberFormat, Property, Prototype
The Intl.NumberFormat.prototype property represents the prototype object for the Intl.NumberFormat constructor.
326 Intl.NumberFormat.prototype.format Internationalization, JavaScript, NumberFormat, Property, Prototype
The Intl.NumberFormat.prototype.format property returns a getter function that formats a number according to the locale and formatting options of this NumberFormat object.
327 Intl.NumberFormat.prototype.resolvedOptions() Internationalization, JavaScript, Method, NumberFormat, Prototype
The Intl.NumberFormat.prototype.resolvedOptions() method returns a new object with properties reflecting the locale and number formatting options computed during initialization of this NumberFormat object.
328 Intl.NumberFormat.supportedLocalesOf() Internationalization, JavaScript, Method, NumberFormat
The Intl.NumberFormat.supportedLocalesOf() method returns an array containing those of the provided locales that are supported in number formatting without having to fall back to the runtime's default locale.
329 Iterator Deprecated, JavaScript, Legacy Iterator, Reference
The Iterator function returns an object which implements legacy iterator protocol and iterates over enumerable properties of an object.
330 JSON JSON, JavaScript, Object, Reference, Référence, polyfill
The JSON object contains methods for parsing JavaScript Object Notation (JSON) and converting values to JSON. It can't be called or constructed, and aside from its two method properties it has no interesting functionality of its own.
331 JSON.parse() ECMAScript5, JSON, JavaScript, Method, Reference
The JSON.parse() method parses a JSON string, constructing the JavaScript value or object described by the string. An optional reviver function can be provided to perform a transformation on the resulting object before it is returned.
332 JSON.stringify() JSON, JavaScript, Method, Reference, stringify
The JSON.stringify() method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified, or optionally including only the specified properties if a replacer array is specified.
333 Map ECMAScript6, JavaScript, Map
The Map object is a simple key/value map. Any value (both objects and primitive values) may be used as either a key or a value.
334 Map.prototype ECMAScript6, JavaScript, Map, Property
Technical review completed.
335 Map.prototype.clear() ECMAScript6, JavaScript, Map, Method, Prototype
The clear() method removes all elements from a Map object.
336 Map.prototype.delete() ECMAScript6, JavaScript, Map, Method, Prototype
The delete() method removes the specified element from a Map object.
337 Map.prototype.entries() ECMAScript6, Iterator, JavaScript, Map, Method, Prototype
The entries() method returns a new Iterator object that contains the [key, value] pairs for each element in the Map object in insertion order.
338 Map.prototype.forEach() ECMAScript6, JavaScript, Map, Method, Prototype
The forEach() method executes a provided function once per each key/value pair in the Map object, in insertion order.
339 Map.prototype.get() ECMAScript6, JavaScript, Map, Method, Prototype
The get() method returns a specified element from a Map object.
340 Map.prototype.has() ECMAScript6, JavaScript, Map, Method, Prototype
The has() method returns a boolean indicating whether an element with the specified key exists or not.
341 Map.prototype.keys() ECMAScript6, Iterator, JavaScript, Map, Method, Prototype
The keys() method returns a new Iterator object that contains the keys for each element in the Map object in insertion order.
342 Map.prototype.set() ECMAScript6, JavaScript, Map, Method, Prototype
The set() method adds or updates an element with a specified key and value to a Map object.
343 Map.prototype.size ECMAScript6, JavaScript, Map, Property
The size accessor property returns the number of elements in a Map object.
344 Map.prototype.values() ECMAScript6, Iterator, JavaScript, Map, Method, Prototype
The values() method returns a new Iterator object that contains the values for each element in the Map object in insertion order.
345 Map.prototype[@@iterator]() ECMAScript6, Iterator, JavaScript, Map, Method, Prototype, Reference
The initial value of the @@iterator property is the same function object as the initial value of the entries property.
346 Map.prototype[@@toStringTag] ECMAScript6, JavaScript, Map, Property, Prototype, Reference, prototype
The Map[@@toStringTag] property has an initial value of "Map".
347 get Map[@@species] ECMAScript6, JavaScript, Map, Property
The Map[@@species] accessor property returns the Map constructor.
348 Math JavaScript, Math, Reference
Math is a built-in object that has properties and methods for mathematical constants and functions. Not a function object.
349 Math.E JavaScript, Math, Property, Reference
The Math.E property represents the base of natural logarithms, e, approximately 2.718.
350 Math.LN10 JavaScript, Math, Property, Reference
The Math.LN10 property represents the natural logarithm of 10, approximately 2.302:
351 Math.LN2 JavaScript, Math, Property, Reference
The Math.LN2 property represents the natural logarithm of 2, approximately 0.693:
352 Math.LOG10E JavaScript, Math, Property, Reference
The Math.LOG10E property represents the base 10 logarithm of e, approximately 0.434:
353 Math.LOG2E JavaScript, Math, Property, Reference
The Math.LOG2E property represents the base 2 logarithm of e, approximately 1.442:
354 Math.PI JavaScript, Math, Property, Reference
The Math.PI property represents the ratio of the circumference of a circle to its diameter, approximately 3.14159:
355 Math.SQRT1_2 JavaScript, Math, Property, Reference
The Math.SQRT1_2 property represents the square root of 1/2 which is approximately 0.707:
356 Math.SQRT2 JavaScript, Math, Property, Reference
The Math.SQRT2 property represents the square root of 2, approximately 1.414:
357 Math.abs() JavaScript, Math, Method, Reference
The Math.abs() function returns the absolute value of a number, that is
358 Math.acos() JavaScript, Math, Method, Reference
The Math.acos() function returns the arccosine (in radians) of a number, that is
359 Math.acosh() JavaScript, Math, Method, Reference
The Math.acosh() function returns the hyperbolic arc-cosine of a number, that is
360 Math.asin() JavaScript, Math, Method, Reference
The Math.asin() function returns the arcsine (in radians) of a number, that is
361 Math.asinh() JavaScript, Math, Method, Reference
The Math.asinh() function returns the hyperbolic arcsine of a number, that is
362 Math.atan() JavaScript, Math, Method, Reference
The Math.atan() function returns the arctangent (in radians) of a number, that is
363 Math.atan2() JavaScript, Math, Method, Reference
The Math.atan2() function returns the arctangent of the quotient of its arguments.
364 Math.atanh() JavaScript, Math, Method, Reference
The Math.atanh() function returns the hyperbolic arctangent of a number, that is
365 Math.cbrt() JavaScript, Math, Method, Reference
The Math.cbrt() function returns the cube root of a number, that is
366 Math.ceil() JavaScript, Math, Method, Reference
The Math.ceil() function returns the smallest integer greater than or equal to a given number.
367 Math.clz32() ECMAScript6, JavaScript, Math, Method, Reference
The Math.clz32() function returns the number of leading zero bits in the 32-bit binary representation of a number.
368 Math.cos() JavaScript, Math, Method, Reference
The Math.cos() function returns the cosine of a number.
369 Math.cosh() JavaScript, Math, Method, Reference
The Math.cosh() function returns the hyperbolic cosine of a number, that can be expressed using the constant e:
370 Math.exp() JavaScript, Math, Method, Reference
The Math.exp() function returns ex, where x is the argument, and e is Euler's number (also known as Napier's constant), the base of the natural logarithms.
371 Math.expm1() JavaScript, Math, Method, Reference
The Math.expm1() function returns ex - 1, where x is the argument, and e the base of the natural logarithms.
372 Math.floor() JavaScript, Math, Method, Reference
The Math.floor() function returns the largest integer less than or equal to a given number.
373 Math.fround() JavaScript, Math, Method, Reference
The Math.fround() function returns the nearest single precision float representation of a number.
374 Math.hypot() JavaScript, Math, Method, Reference
The Math.hypot() function returns the square root of the sum of squares of its arguments, that is
375 Math.imul() JavaScript, Math, Method, Reference
The Math.imul() function returns the result of the C-like 32-bit multiplication of the two parameters.
376 Math.log() JavaScript, Math, Method, Reference
The Math.log() function returns the natural logarithm (base e) of a number, that is
377 Math.log10() ECMAScript6, JavaScript, Math, Method, Reference
The Math.log10() function returns the base 10 logarithm of a number, that is
378 Math.log1p() ECMAScript6, JavaScript, Math, Method, Reference
The Math.log1p() function returns the natural logarithm (base e) of 1 + a number, that is
379 Math.log2() ECMAScript6, JavaScript, Math, Method, Reference
The Math.log2() function returns the base 2 logarithm of a number, that is
380 Math.max() JavaScript, Math, Method, Reference
The Math.max() function returns the largest of zero or more numbers.
381 Math.min() JavaScript, Math, Method, Reference
The Math.min() function returns the smallest of zero or more numbers.
382 Math.pow() JavaScript, Math, Method, Reference
The Math.pow() function returns the base to the exponent power, that is, baseexponent.
383 Math.random() JavaScript, Math, Method, Reference
The Math.random() function returns a floating-point, pseudo-random number in the range [0, 1) that is, from 0 (inclusive) up to but not including 1 (exclusive), which you can then scale to your desired range. The implementation selects the initial seed to the random number generation algorithm; it cannot be chosen or reset by the user.
384 Math.round() JavaScript, Math, Method, Reference
The Math.round() function returns the value of a number rounded to the nearest integer.
385 Math.sign() JavaScript, Math, Method, Reference
The Math.sign() function returns the sign of a number, indicating whether the number is positive, negative or zero.
386 Math.sin() JavaScript, Math, Method, Reference
The Math.sin() function returns the sine of a number.
387 Math.sinh() ECMAScript6, JavaScript, Math, Method, Reference
The Math.sinh() function returns the hyperbolic sine of a number, that can be expressed using the constant e:
388 Math.sqrt() JavaScript, Math, Method, Reference
The Math.sqrt() function returns the square root of a number, that is
389 Math.tan() JavaScript, Math, Method, Reference
The Math.tan() function returns the tangent of a number.
390 Math.tanh() ECMAScript6, JavaScript, Math, Method, Reference
The Math.tanh() function returns the hyperbolic tangent of a number, that is
391 Math.trunc() ECMAScript6, JavaScript, Math, Method, Reference
The Math.trunc() function returns the integral part of a number by removing any fractional digits.
392 NaN JavaScript
The global NaN property is a value representing Not-A-Number.
393 Number JavaScript, Number, Reference
The Number JavaScript object is a wrapper object allowing you to work with numerical values. A Number object is created using the Number() constructor.
394 Number.EPSILON ECMAScript6, JavaScript, Number, Property
The Number.EPSILON property represents the difference between one and the smallest value greater than one that can be represented as a Number.
395 Number.MAX_SAFE_INTEGER ECMAScript6, JavaScript, Number, Property
The Number.MAX_SAFE_INTEGER constant represents the maximum safe integer in JavaScript (253 - 1).
396 Number.MAX_VALUE JavaScript, Number, Property
The Number.MAX_VALUE property represents the maximum numeric value representable in JavaScript.
397 Number.MIN_SAFE_INTEGER ECMAScript6, JavaScript, Number, Property
The Number.MIN_SAFE_INTEGER constant represents the minimum safe integer in JavaScript (-(253 - 1)).
398 Number.MIN_VALUE JavaScript, Number, Property
The Number.MIN_VALUE property represents the smallest positive numeric value representable in JavaScript.
399 Number.NEGATIVE_INFINITY JavaScript, Number, Property
The Number.NEGATIVE_INFINITY property represents the negative Infinity value.
400 Number.NaN JavaScript, Number, Property
The Number.NaN property represents Not-A-Number. Equivalent of NaN.
401 Number.POSITIVE_INFINITY JavaScript, Number, Property
The Number.POSITIVE_INFINITY property represents the positive Infinity value.
402 Number.isFinite() JavaScript, Method, Number, Reference
The Number.isFinite() method determines whether the passed value is a finite number.
403 Number.isInteger() JavaScript, Method, Number, Reference
The Number.isInteger() method determines whether the passed value is an integer.
404 Number.isNaN() ECMAScript6, JavaScript, Method, Number
The Number.isNaN() method determines whether the passed value is NaN. It is a more robust version of the original, global isNaN().
405 Number.isSafeInteger() ECMAScript6, JavaScript, Method, Number
Editorial review completed.
406 Number.parseFloat() ECMAScript6, JavaScript, Method, Number
The Number.parseFloat() method parses a string argument and returns a floating point number. This method behaves identically to the global function parseFloat() and is part of ECMAScript 6 (its purpose is modularization of globals).
407 Number.parseInt() ECMAScript6, JavaScript, Method, Number
The Number.parseInt() method parses a string argument and returns an integer of the specified radix or base.
408 Number.prototype JavaScript, Number, Property, Prototype
The Number.prototype property represents the prototype for the Number constructor.
409 Number.prototype.toExponential() JavaScript, Method, Number, Prototype
The toExponential() method returns a string representing the Number object in exponential notation.
410 Number.prototype.toFixed() JavaScript, Method, Number, Prototype
The toFixed() method formats a number using fixed-point notation.
411 Number.prototype.toLocaleString() Internationalization, JavaScript, Method, Number, Prototype
The toLocaleString() method returns a string with a language sensitive representation of this number.
412 Number.prototype.toPrecision() JavaScript, Method, Number, Prototype
The toPrecision() method returns a string representing the Number object to the specified precision.
413 Number.prototype.toSource() JavaScript, Method, Number, Prototype
The toSource() method returns a string representing the source code of the object.
414 Number.prototype.toString() JavaScript, Method, Number, Prototype
The toString() method returns a string representing the specified Number object.
415 Number.prototype.valueOf() JavaScript, Method, Number, Prototype
The valueOf() method returns the wrapped primitive value of a Number object.
416 Number.toInteger() JavaScript, Method, Number, Obsolete
The Number.toInteger() method used to evaluate the passed value and convert it to an integer, but its implementation has been removed.
417 Object Constructor, JavaScript, Object
The Object constructor creates an object wrapper.
418 Object.assign() ECMAScript6, JavaScript, Method, Object, Reference, polyfill
The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object.
419 Object.create() ECMAScript5, JavaScript, Method, Object, Reference, polyfill
The Object.create() method creates a new object with the specified prototype object and properties.
420 Object.defineProperties() ECMAScript5, JavaScript, Method, Object
The Object.defineProperties() method defines new or modifies existing properties directly on an object, returning the object.
421 Object.defineProperty() ECMAScript5, JavaScript, JavaScript 1.8.5, Method, Object
The Object.defineProperty() method defines a new property directly on an object, or modifies an existing property on an object, and returns the object.
422 Additional examples for Object.defineProperty Examples, JavaScript, Object
This page provides additional examples for Object.defineProperty().
423 Object.entries() Experimental, JavaScript, Method, Object, Reference
The Object.entries() method returns an array of a given object's own enumerable property [key, value] pairs, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).
424 Object.freeze() ECMAScript5, JavaScript, Method, Object
The Object.freeze() method freezes an object: that is, prevents new properties from being added to it; prevents existing properties from being removed; and prevents existing properties, or their enumerability, configurability, or writability, from being changed. In essence the object is made effectively immutable. The method returns the object being frozen.
425 Object.getNotifier() JavaScript, Method, Object, Obsolete
The Object.getNotifer() method was used to create an object that allows to synthetically trigger a change, but has been deprecated and removed in browsers.
426 Object.getOwnPropertyDescriptor() ECMAScript5, JavaScript, Method, Object
The Object.getOwnPropertyDescriptor() method returns a property descriptor for an own property (that is, one directly present on an object and not in the object's prototype chain) of a given object.
427 Object.getOwnPropertyDescriptors() JavaScript, Method, Object
The Object.getOwnPropertyDescriptors() method returns all own property descriptors of a given object.
428 Object.getOwnPropertyNames() ECMAScript5, JavaScript, JavaScript 1.8.5, Method, Object, Reference
The Object.getOwnPropertyNames() method returns an array of all properties (enumerable or not) found directly upon a given object.
429 Object.getOwnPropertySymbols() ECMAScript6, JavaScript, Method, Object
The Object.getOwnPropertySymbols() method returns an array of all symbol properties found directly upon a given object.
430 Object.getPrototypeOf() ECMAScript5, JavaScript, Method, Object
The Object.getPrototypeOf() method returns the prototype (i.e. the value of the internal [[Prototype]] property) of the specified object.
431 Object.is() Comparison, Condition, Conditional, ECMAScript6, Equality, JavaScript, Method, Object
The Object.is() method determines whether two values are the same value.
432 Object.isExtensible() ECMAScript5, JavaScript, JavaScript 1.8.5, Method, Object
The Object.isExtensible() method determines if an object is extensible (whether it can have new properties added to it).
433 Object.isFrozen() ECMAScript5, JavaScript, JavaScript 1.8.5, Method, Object
The Object.isFrozen() determines if an object is frozen.
434 Object.isSealed() ECMAScript5, JavaScript, JavaScript 1.8.5, Method, Object
The Object.isSealed() method determines if an object is sealed.
435 Object.keys() ECMAScript5, JavaScript, JavaScript 1.8.5, Method, Object
The Object.keys() method returns an array of a given object's own enumerable properties, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).
436 Object.observe() JavaScript, Method, Object, Obsolete
The Object.observe() method was used for asynchronously observing the changes to an object. It provided a stream of changes in the order in which they occur. However, this API has been deprecated and removed from browsers. You can use the more general Proxy object instead.
437 Object.preventExtensions() ECMAScript5, JavaScript, JavaScript 1.8.5, Method, Object
The Object.preventExtensions() method prevents new properties from ever being added to an object (i.e. prevents future extensions to the object).
438 Object.prototype JavaScript, Object, Property
The Object.prototype property represents the Object prototype object.
439 Object.prototype.__count__ JavaScript, Object, Obsolete, Property, Prototype
The __count__ property used to store the count of enumerable properties on the object, but it has been removed.
440 Object.prototype.__defineGetter__() Deprecated, JavaScript, Method, Object, Prototype
The __defineGetter__ method binds an object's property to a function to be called when that property is looked up.
441 Object.prototype.__defineSetter__() Deprecated, JavaScript, Method, Object, Prototype, prototype
The __defineSetter__ method binds an object's property to a function to be called when an attempt is made to set that property.
442 Object.prototype.__lookupGetter__() Deprecated, JavaScript, Method, Object, Prototype, prototype
The __lookupGetter__ method returns the function bound as a getter to the specified property.
443 Object.prototype.__lookupSetter__() Deprecated, JavaScript, Method, Object, Prototype, prototype
The __lookupSetter__ method returns the function bound as a setter to the specified property.
444 Object.prototype.__noSuchMethod__ JavaScript, Object, Obsolete, Property, Prototype, prototype
The __noSuchMethod__ property used to reference a function to be executed when a non-existent method is called on an object, but this function is no longer available.
445 Object.prototype.__parent__ JavaScript, Object, Obsolete, Property, Prototype
The __parent__ property used to point to an object's context, but it has been removed.
446 Object.prototype.__proto__ Deprecated, JavaScript, Object, Property, Prototype, Reference
The __proto__ property of Object.prototype is an accessor property (a getter function and a setter function) that exposes the internal [[Prototype]] (either an object or null) of the object through which it is accessed.
447 Object.prototype.constructor JavaScript, Object, Property, Prototype
Returns a reference to the Object function that created the instance's prototype. Note that the value of this property is a reference to the function itself, not a string containing the function's name. The value is only read-only for primitive values such as 1true and "test".
448 Object.prototype.eval() JavaScript, Method, Object, Obsolete
The Object.eval() method used to evaluate a string of JavaScript code in the context of an object, however, this method has been removed.
449 Object.prototype.hasOwnProperty() JavaScript, Method, Object, Prototype
The hasOwnProperty() method returns a boolean indicating whether the object has the specified property.
450 Object.prototype.isPrototypeOf() JavaScript, Method, Object, Prototype, Reference, isPrototype
The isPrototypeOf() method tests for an object in another object's prototype chain.
451 Object.prototype.propertyIsEnumerable() JavaScript, Method, Object, Prototype
The propertyIsEnumerable() method returns a Boolean indicating whether the specified property is enumerable.
452 Object.prototype.toLocaleString() JavaScript, Method, Object, Prototype, prototype
The toLocaleString() method returns a string representing the object. This method is meant to be overridden by derived objects for locale-specific purposes.
453 Object.prototype.toSource() JavaScript, Method, Object, Prototype
The toSource() method returns a string representing the source code of the object.
454 Object.prototype.toString() JavaScript, Method, Object, Prototype
The toString() method returns a string representing the object.
455 Object.prototype.unwatch() JavaScript, Method, Object, Prototype, Reference
The unwatch() method removes a watchpoint set with the watch() method.
456 Object.prototype.valueOf() JavaScript, Method, Object, Prototype
The valueOf() method returns the primitive value of the specified object.
457 Object.prototype.watch() JavaScript, Method, Object, Prototype
The watch() method watches for a property to be assigned a value and runs a function when that occurs.
458 Object.seal() ECMAScript5, JavaScript, JavaScript 1.8.5, Method, Object
The Object.seal() method seals an object, preventing new properties from being added to it and marking all existing properties as non-configurable. Values of present properties can still be changed as long as they are writable.
459 Object.setPrototypeOf() ECMAScript6, JavaScript, Method, Object, Prototype
The Object.setPrototypeOf() method sets the prototype (i.e., the internal [[Prototype]] property) of a specified object to another object or null.
460 Object.unobserve() JavaScript, Method, Object, Obsolete
The Object.unobserve() method was used to remove observers set by Object.observe(), but has been deprecated and removed from Browsers. You can use the more general Proxy object instead.
461 Object.values() Experimental, JavaScript, Method, Object, Reference
The Object.values() method returns an array of a given object's own enumerable property values, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).
462 ParallelArray JavaScript, Obsolete, ParallelArray
The goal of ParallelArray was to enable data-parallelism in web applications. The higher-order functions available on ParallelArray attempted to execute in parallel, though they may fall back to sequential execution if necessary. To ensure that your code executes in parallel, it is suggested that the functions should be limited to the parallelizable subset of JS that Firefox supports.
463 Promise ECMAScript6, JavaScript, Promise
The Promise object is used for asynchronous computations. A Promise represents a value which may be available now, or in the future, or never.
464 Promise.all() ECMAScript6, JavaScript, Method, Promise
The Promise.all(iterable) method returns a promise that resolves when all of the promises in the iterable argument have resolved, or rejects with the reason of the first passed promise that rejects.
465 Promise.prototype JavaScript, Promise, Property
The Promise.prototype property represents the prototype for the Promise constructor.
466 Promise.prototype.catch() ECMAScript6, JavaScript, Method, Promise, Prototype
The catch() method returns a Promise and deals with rejected cases only. It behaves the same as calling Promise.prototype.then(undefined, onRejected).
467 Promise.prototype.then() ECMAScript6, JavaScript, Method, Promise, Prototype
The then() method returns a Promise. It takes up to two arguments: callback functions for the success and failure cases of the Promise.
468 Promise.race() ECMAScript6, JavaScript, Method, Promise
The Promise.race(iterable) method returns a promise that resolves or rejects as soon as one of the promises in the iterable resolves or rejects, with the value or reason from that promise.
469 Promise.reject() ECMAScript6, JavaScript, Method, Promise
The Promise.reject(reason) method returns a Promise object that is rejected with the given reason.
470 Promise.resolve() ECMAScript6, JavaScript, Method, Promise
The Promise.resolve(value) method returns a Promise object that is resolved with the given value. If the value is a thenable (i.e. has a "then" method), the returned promise will "follow" that thenable, adopting its eventual state; otherwise the returned promise will be fulfilled with the value.
471 Proxy ECMAScript6, JavaScript, Proxy
The Proxy object is used to define custom behavior for fundamental operations (e.g. property lookup, assignment, enumeration, function invocation, etc).
472 Proxy handler ECMAScript6, JavaScript, Proxy
The proxy's handler object is a placeholder object which contains traps for proxies.
473 handler.apply() ECMAScript6, JavaScript, Method, Proxy
The handler.apply() method is a trap for a function call.
474 handler.construct() ECMAScript6, JavaScript, Method, Proxy
The handler.construct() method is a trap for the new operator.
475 handler.defineProperty() ECMAScript6, JavaScript, Method, Proxy
The handler.defineProperty() method is a trap for Object.defineProperty().
476 handler.deleteProperty() ECMAScript6, JavaScript, Method, Proxy
The handler.deleteProperty() method is a trap for the delete operator.
477 handler.enumerate() ECMAScript6, JavaScript, Method, Obsolete, Proxy
The handler.enumerate() method used to be a trap for for...in statements, but has been removed from the ECMAScript standard in edition 7 and is deprecated in browsers.
478 handler.get() ECMAScript6, JavaScript, Method, Proxy
The handler.get() method is a trap for getting a property value.
479 handler.getOwnPropertyDescriptor() ECMAScript6, JavaScript, Method, Proxy
The handler.getOwnPropertyDescriptor() method is a trap for Object.getOwnPropertyDescriptor().
480 handler.getPrototypeOf() ECMAScript6, JavaScript, Javascript, Method, Proxy, javascript
The handler.getPrototypeOf() method is a trap for the [[GetPrototypeOf]] internal method.
481 handler.has() ECMAScript6, JavaScript, Method, Proxy
The handler.has() method is a trap for the in operator.
482 handler.isExtensible() ECMAScript6, JavaScript, Method, Proxy
The handler.isExtensible() method is a trap for Object.isExtensible().
483 handler.ownKeys() ECMAScript6, JavaScript, Method, Proxy
The handler.ownKeys() method is a trap for Object.getOwnPropertyNames().
484 handler.preventExtensions() ECMAScript6, JavaScript, Method, Proxy
The handler.preventExtensions() method is a trap for Object.preventExtensions().
485 handler.set() ECMAScript6, JavaScript, Method, Proxy
The handler.set() method is a trap for setting a property value.
486 handler.setPrototypeOf() ECMAScript6, JavaScript, Method, Prototype, Proxy, prototype
The handler.setPrototypeOf() method is a trap for Object.setPrototypeOf().
487 Proxy.revocable() ECMAScript6, JavaScript, Method, Proxy
The Proxy.revocable() method is used to create a revocable Proxy object.
488 RangeError Error, JavaScript, Object, RangeError
The RangeError object indicates an error when a value is not in the set or range of allowed values.
489 RangeError.prototype Error, JavaScript, Property, Prototype, RangeError, prototype
The RangeError.prototype property represents the prototype the RangeError constructor.
490 ReferenceError Error, JavaScript, Object, Reference, ReferenceError
The ReferenceError object represents an error when a non-existent variable is referenced.
491 ReferenceError.prototype Error, JavaScript, Property, Prototype, ReferenceError, prototype
The ReferenceError.prototype property represents the prototype for the ReferenceError constructor.
492 Reflect ECMAScript6, JavaScript, Overview, Reflect
Reflect is a built-in object that provides methods for interceptable JavaScript operations. The methods are the same as those of proxy handlers. Reflect is not a function object, so it's not constructible.
493 Reflect.apply() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.apply() method calls a target function with arguments as specified.
494 Reflect.construct() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.construct() method acts like the new operator as a function. It is equivalent to calling new target(...args).
495 Reflect.defineProperty() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.defineProperty() method is like Object.defineProperty() but returns a Boolean.
496 Reflect.deleteProperty() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.deleteProperty() method allows to delete properties. It is like the delete operator as a function.
497 Reflect.enumerate() ECMAScript6, JavaScript, Method, Obsolete, Reflect
The static Reflect.enumerate() method used to return an iterator with the enumerable own and inherited properties of the target object, but has been removed from the ECMAScript standard in edition 7 and is deprecated in browsers.
498 Reflect.get() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.get() method works like getting a property from an object (target[propertyKey]) as a function.
499 Reflect.getOwnPropertyDescriptor() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.getOwnPropertyDescriptor() method is similar to Object.getOwnPropertyDescriptor(). It returns a property descriptor of the given property if it exists on the object, undefined otherwise.
500 Reflect.getPrototypeOf() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.getPrototypeOf() method is the same method as Object.getPrototypeOf(). It returns the prototype (i.e. the value of the internal [[Prototype]] property) of the specified object.
501 Reflect.has() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.has() method works like the in operator as a function.
502 Reflect.isExtensible() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.isExtensible() method determines if an object is extensible (whether it can have new properties added to it). It is similar to Object.isExtensible(), but with some differences.
503 Reflect.ownKeys() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.ownKeys() method returns an array of the target object's own property keys.
504 Reflect.preventExtensions() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.preventExtensions() method prevents new properties from ever being added to an object (i.e. prevents future extensions to the object). It is similar to Object.preventExtensions(), but with some differences.
505 Reflect.set() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.set() method works like setting a property on an object.
506 Reflect.setPrototypeOf() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.setPrototypeOf() method is the same method as Object.setPrototypeOf(). It sets the prototype (i.e., the internal [[Prototype]] property) of a specified object to another object or to null.
507 RegExp Constructor, JavaScript, Reference, RegExp, Regular Expressions
The RegExp constructor creates a regular expression object for matching text with a pattern.
508 RegExp.$1-$9 JavaScript, Property, Read-only, Reference, RegExp, Regular Expressions
The non-standard $1, $2, $3, $4, $5, $6, $7, $8, $9 properties are static and read-only properties of regular expressions that contain parenthesized substring matches.
509 RegExp.input ($_) JavaScript, Property, Reference, RegExp, Regular Expressions
The non-standard input property is a static property of regular expressions that contains the string against which a regular expression is matched. RegExp.$_ is an alias for this property.
510 RegExp.lastMatch ($&) JavaScript, Property, Read-only, Reference, RegExp, Regular Expressions
The non-standard lastMatch property is a static and read-only property of regular expressions that contains the last matched characters. RegExp.$& is an alias for this property.
511 RegExp.lastParen ($+) JavaScript, Property, Read-only, Reference, RegExp, Regular Expressions
The non-standard lastParen property is a static and read-only property of regular expressions that contains the last parenthesized substring match, if any. RegExp.$+ is an alias for this property.
512 RegExp.leftContext ($`) JavaScript, Property, Read-only, Reference, RegExp, Regular Expressions
The non-standard leftContext property is a static and read-only property of regular expressions that contains the substring preceding the most recent match. RegExp.$` is an alias for this property.
513 RegExp.prototype JavaScript, Property, Prototype, Reference, RegExp, prototype
The RegExp.prototype property represents the prototype object for the RegExp constructor.
514 RegExp.prototype.compile() Deprecated, JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions, prototype
The deprecated compile() method is used to (re-)compile a regular expression during execution of a script. It is basically the same as the RegExp constructor.
515 RegExp.prototype.exec() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions
The exec() method executes a search for a match in a specified string. Returns a result array, or null.
516 RegExp.prototype.flags ECMAScript6, JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions
The flags property returns a string consisting of the flags of the current regular expression object.
517 RegExp.prototype.global JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions
The global property indicates whether or not the "g" flag is used with the regular expression. global is a read-only property of an individual regular expression instance.
518 RegExp.prototype.ignoreCase JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions
The ignoreCase property indicates whether or not the "i" flag is used with the regular expression. ignoreCase is a read-only property of an individual regular expression instance.
519 RegExp.prototype.multiline JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions
The multiline property indicates whether or not the "m" flag is used with the regular expression. multiline is a read-only property of an individual regular expression instance.
520 RegExp.prototype.source JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions
The source property returns a String containing the source text of the regexp object, and it doesn't contain the two forward slashes on both sides and any flags.
521 RegExp.prototype.sticky ECMAScript6, JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions
The sticky property reflects whether or not the search is sticky (searches in strings only from the index indicated by the lastIndex property of this regular expression). sticky is a read-only property of an individual regular expression object.
522 RegExp.prototype.test() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions
The test() method executes a search for a match between a regular expression and a specified string. Returns true or false.
523 RegExp.prototype.toSource() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions
The toSource() method returns a string representing the source code of the object.
524 RegExp.prototype.toString() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions
The toString() method returns a string representing the regular expression.
525 RegExp.prototype.unicode ECMAScript6, JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions
The unicode property indicates whether or not the "u" flag is used with a regular expression. unicode is a read-only property of an individual regular expression instance.
526 RegExp.prototype[@@match]() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions
The [@@match]() method retrieves the matches when matching a string against a regular expression.
527 RegExp.prototype[@@replace]() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions, prototype
The [@@replace]() method replaces some or all matches of a this pattern in a string by a replacement, and returns the result of the replacement as a new string. The replacement can be a string or a function to be called for each match.
528 RegExp.prototype[@@search]() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions
The [@@search]() method executes a search for a match between a this regular expression and a string.
529 RegExp.prototype[@@split]() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions, prototype
The [@@split]() method splits a String object into an array of strings by separating the string into substrings.
530 RegExp.rightContext ($') JavaScript, Property, Read-only, Reference, RegExp, Regular Expressions
The non-standard rightContext property is a static and read-only property of regular expressions that contains the substring following the most recent match. RegExp.$' is an alias for this property.
531 get RegExp[@@species] JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions, prototype
The RegExp[@@species] accessor property returns the RegExp constructor.
532 regexp.lastIndex JavaScript, Property, Reference, RegExp, Regular Expressions
The lastIndex is a read/write integer property of regular expression instances that specifies the index at which to start the next match.
533 SIMD Experimental, JavaScript, SIMD
SIMD (pronounced "sim-dee") is short for Single Instruction/Multiple Data which is one classification of computer architectures. SIMD operations perform the same computation on multiple data points resulting in data level parallelism and thus performance gains, for example for 3D graphics and video processing, physics simulations or cryptography, and other domains.
534 SIMD.%type%.abs() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.abs() method returns a new SIMD data type with absolute values. This operation exists only on floating point SIMD types.
535 SIMD.%type%.add() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.add() method returns a new instance with the lane values added (a + b).
536 SIMD.%type%.addSaturate() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.addSaturate() method returns a new instance with the lane values added (a + b) and saturating behavior on overflow.
537 SIMD.%type%.allTrue() Experimental, JavaScript, Method, SIMD
The static SIMD.%BooleanType%.allTrue() method returns a Boolean indicating whether or not all lanes hold a true value.
538 SIMD.%type%.and() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.and() method returns a new instance with the logical AND of the lane values (a & b). This operation exists only on integer and boolean SIMD types.
539 SIMD.%type%.anyTrue() Experimental, JavaScript, SIMD
The static SIMD.%BooleanType%.anyTrue() method returns a Boolean indicating whether or not any of the lanes hold a true value.
540 SIMD.%type%.check() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.check() method returns a SIMD data type if the parameter is a valid SIMD data type and the same as %type%. Otherwise, a TypeError is thrown.
541 SIMD.%type%.div() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.div() method returns a new instance with the lane values divided (a / b). This function is defined only on floating point SIMD types.
542 SIMD.%type%.equal() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.equal() method returns a selection mask with values depending on a strict equality comparison (a === b) in each lane.
543 SIMD.%type%.extractLane() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.extractLane() method returns the value of a given lane.
544 SIMD.%type%.fromFloat32x4() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromFloat32x4() method creates a new SIMD data type with a float conversion from a Float32x4.
545 SIMD.%type%.fromFloat32x4Bits() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromFloat32x4Bits() method creates a new SIMD data type with a bit-wise copy from a Float32x4.
546 SIMD.%type%.fromFloat64x2Bits() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromFloat64x2Bits() method creates a new SIMD data type with a bit-wise copy from a Float64x2.
547 SIMD.%type%.fromInt16x8Bits() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromInt16x8Bits() method creates a new SIMD data type with a bit-wise copy from an int16x8.
548 SIMD.%type%.fromInt32x4() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromInt32x4() method creates a new SIMD data type with a float conversion from an Int32x4.
549 SIMD.%type%.fromInt32x4Bits() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromInt32x4Bits() method creates a new SIMD data type with a bit-wise copy from an Int32x4.
550 SIMD.%type%.fromInt8x16Bits() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromInt8x16Bits() method creates a new SIMD data type with a bit-wise copy from an Int8x16.
551 SIMD.%type%.fromUint16x8Bits() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromUint16x8Bits() method creates a new SIMD data type with a bit-wise copy from a Uint16x8.
552 SIMD.%type%.fromUint32x4() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromUint32x4() method creates a new SIMD data type with a conversion from a Uint32x4.
553 SIMD.%type%.fromUint32x4Bits() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromUint32x4Bits() method creates a new SIMD data type with a bit-wise copy from a Uint32x4.
554 SIMD.%type%.fromUint8x16Bits() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.fromUint8x16Bits() method creates a new SIMD data type with a bit-wise copy from a Uint8x16.
555 SIMD.%type%.greaterThan() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.greaterThan() method returns a selection mask with values depending on a greater-than comparison (a > b) in each lane.
556 SIMD.%type%.greaterThanOrEqual() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.greaterThanOrEqual() method returns a selection mask with values depending on a greater-than-or-equal comparison (a >= b) in each lane.
557 SIMD.%type%.lessThan() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.lessThan() method returns a selection mask with values depending on a less-than comparison (a < b) in each lane.
558 SIMD.%type%.lessThanOrEqual() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.lessThanOrEqual() method returns a selection mask with values depending on a less-than-or-equal comparison (a <= b) in each lane.
559 SIMD.%type%.load() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.load() methods create a new SIMD data type with the lane values loaded from a typed array.
560 SIMD.%type%.max() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.max() method returns a new instance with the maximum lane values of two SIMD types (Math.max(a, b)).
561 SIMD.%type%.maxNum() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.maxNum() method returns a new instance with the maximum lane values of two SIMD types (Math.max(a, b)) preferring numbers over NaN.
562 SIMD.%type%.min() Experimental, Expérimental, JavaScript, Method, SIMD
The static SIMD.%type%.min() method returns a new instance with the minimum lane values of two SIMD types (Math.min(a, b)).
563 SIMD.%type%.minNum() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.minNum() method returns a new instance with the minimum lane values of two SIMD types (Math.min(a, b)) preferring numbers over NaN.
564 SIMD.%type%.mul() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.mul() method returns a new instance with the lane values multiplied (a * b).
565 SIMD.%type%.neg() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.mul() method returns a new instance with the lane values negated.
566 SIMD.%type%.not() Experimental, JavaScript, Method, Reference, SIMD
The static SIMD.%type%.not() method returns a new instance with the bitwise logical NOT of the lane values (~a). This operation exists only on integer and boolean SIMD types.
567 SIMD.%type%.notEqual() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.notEqual() method returns a selection mask with values depending on an inequality comparison (a != b) in each lane.
568 SIMD.%type%.or() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.or() method returns a new instance with the logical OR of the lane values (a | b). This operation exists only on integer and boolean SIMD types.
569 SIMD.%type%.prototype.toSource() JavaScript, Method, Non-standard, Prototype, SIMD, prototype
The non-standard SIMD.%type%.toSource() method returns a string representing the source code of the object.
570 SIMD.%type%.prototype.toString() Experimental, JavaScript, Method, SIMD
The SIMD.%type%.toString() method returns a String representing a SIMD object.
571 SIMD.%type%.prototype.valueOf() Experimental, JavaScript, Method, SIMD
The SIMD.%type%.valueOf() method performs a type check returns the this value.
572 SIMD.%type%.reciprocalApproximation() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.reciprocalApproximation() method returns a new instance with an approximation of the reciprocal lane values (1 / x).
573 SIMD.%type%.reciprocalSqrtApproximation() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.reciprocalSqrtApproximation() method returns a new instance with an approximation of the reciprocal value (1 / x) of the square root (Math.sqrt()) of the lane values.
574 SIMD.%type%.replaceLane() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.replaceLane() method returns a new SIMD data type with the given lane value replaced.
575 SIMD.%type%.select() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.select() method creates a new integer SIMD data type with the lane values being a selection match from a selector mask.
576 SIMD.%type%.shiftLeftByScalar() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.shiftLeftByScalar() method returns a new instance with the lane values shifted left by a given bit count (a << bits).
577 SIMD.%type%.shiftRightByScalar() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.shiftRightByScalar() method returns a new instance with the lane values shifted right. Depending on the type, these operations are used:
578 SIMD.%type%.shuffle() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.shuffle() method creates a new SIMD data type instance with the lane values shuffled.
579 SIMD.%type%.splat() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.splat() method creates a new SIMD data type with all lanes set to a given value.
580 SIMD.%type%.sqrt() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.sqrt() method returns a new instance with the square root of the lane values (see also Math.sqrt() for the same scalar function).
581 SIMD.%type%.store() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.store() methods store a SIMD data type into a typed array.
582 SIMD.%type%.sub() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.sub() method returns a new instance with the lane values subtracted (a - b).
583 SIMD.%type%.subSaturate() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.subSaturate() method returns a new instance with the lane values subtracted (a - b) and saturating behavior on overflow.
584 SIMD.%type%.swizzle() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.swizzle() method creates a new SIMD data type instance with the lane values swizzled (re-ordered).
585 SIMD.%type%.xor() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.xor() method returns a new instance with the logical XOR of the lane values (a ^ b).
586 SIMD.Bool16x8 Experimental, JavaScript, SIMD
The SIMD.Bool16x8 data type is a 128-bit vector divided into 8 lanes storing boolean values.
587 SIMD.Bool32x4 Experimental, JavaScript, SIMD
The SIMD.Bool32x4 data type is a 128-bit vector divided into 4 lanes storing boolean values.
588 SIMD.Bool64x2 Experimental, JavaScript, SIMD
The SIMD.Bool64x2 data type is a 128-bit vector divided into 2 lanes storing boolean values.
589 SIMD.Bool8x16 Experimental, JavaScript, SIMD
The SIMD.Bool8x16 data type is a 128-bit vector divided into 16 lanes storing boolean values.
590 SIMD.Float32x4 Experimental, JavaScript, SIMD
The SIMD.Float32x4 data type is a 128-bit vector divided into 4 lanes storing single precision floating point values.
591 SIMD.Float64x2 Experimental, JavaScript, SIMD
The SIMD.Float64x2 data type is a 128-bit vector divided into 2 lanes storing double precision floating point values.
592 SIMD.Int16x8 Experimental, JavaScript, SIMD
The SIMD.Int16x8 data type is a 128-bit vector divided into 8 lanes storing 16-bit signed integer values.
593 SIMD.Int32x4 Experimental, JavaScript, SIMD
The SIMD.Int32x4 data type is a 128-bit vector divided into 4 lanes storing 32-bit signed integer values.
594 SIMD.Int8x16 Experimental, JavaScript, SIMD
The SIMD.Int8x16 data type is a 128-bit vector divided into 16 lanes storing 8-bit signed integer values.
595 SIMD.Uint16x8 Experimental, JavaScript, SIMD
The SIMD.Uint16x8 data type is a 128-bit vector divided into 8 lanes storing 16-bit unsigned integer values.
596 SIMD.Uint32x4 Experimental, JavaScript, SIMD
The SIMD.Uint32x4 data type is a 128-bit vector divided into 4 lanes storing 32-bit unsigned integer values.
597 SIMD.Uint8x16 Experimental, JavaScript, SIMD
The SIMD.Uint8x16 data type is a 128-bit vector divided into 16 lanes storing 8-bit unsigned integer values.
598 Set ECMAScript6, JavaScript, set
The Set object lets you store unique values of any type, whether primitive values or object references.
599 Set.prototype ECMAScript6, JavaScript, Property, set
The Set.prototype property represents the prototype for the Set constructor.
600 Set.prototype.add() ECMAScript6, JavaScript, Method, Prototype, set
The add() method appends a new element with a specified value to the end of a Set object.
601 Set.prototype.clear() ECMAScript6, JavaScript, Method, Prototype, set
The clear() method removes all elements from a Set object.
602 Set.prototype.delete() ECMAScript6, JavaScript, Method, Prototype, set
The delete() method removes the specified element from a Set object.
603 Set.prototype.entries() ECMAScript6, Iterator, JavaScript, Method, Prototype, set
The entries() method returns a new Iterator object that contains an array of [value, value] for each element in the Set object, in insertion order. For Set objects there is no key like in Map objects. However, to keep the API similar to the Map object, each entry has the same value for its key and value here, so that an array [value, value] is returned.
604 Set.prototype.forEach() ECMAScript6, JavaScript, Method, Prototype, set
The forEach() method executes a provided function once per each value in the Set object, in insertion order.
605 Set.prototype.has() ECMAScript6, JavaScript, Method, Prototype, set
The has() method returns a boolean indicating whether an element with the specified value exists in a Set object or not.
606 Set.prototype.size ECMAScript6, JavaScript, Property, Prototype, set
The size accessor property returns the number of elements in a Set object.
607 Set.prototype.values() ECMAScript6, Iterator, JavaScript, Method, Prototype, set
The values() method returns a new Iterator object that contains the values for each element in the Set object in insertion order.
608 Set.prototype[@@iterator]() ECMAScript6, Iterator, JavaScript, Method, Prototype, Reference, set
The initial value of the @@iterator property is the same function object as the initial value of the values property.
609 get Set[@@species] ECMAScript6, JavaScript, Property, set
The Set[@@species] accessor property returns the Set constructor.
610 SharedArrayBuffer Constructor, Experimental, JavaScript, Shared Memory, SharedArrayBuffer, TypedArrays
The SharedArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer, similar to the ArrayBuffer object, but in a way that they can be used to create views on shared memory. Unlike an ArrayBuffer, a SharedArrayBuffer cannot become detached.
611 SharedArrayBuffer.prototype Experimental, JavaScript, Property, Shared Memory, SharedArrayBuffer, TypedArrays
The SharedArrayBuffer.prototype property represents the prototype for the SharedArrayBuffer object.
612 SharedArrayBuffer.prototype.byteLength Experimental, JavaScript, Property, Shared Memory, SharedArrayBuffer, TypedArrays
The byteLength accessor property represents the length of an SharedArrayBuffer in bytes.
613 StopIteration Deprecated, JavaScript, Legacy Iterator, Reference, StopIteration
The StopIteration object is used to tell the end of the iteration in the legacy iterator protocol.
614 String ECMAScript6, JavaScript, Reference, String
The String global object is a constructor for strings, or a sequence of characters.
615 String.fromCharCode() JavaScript, Method, Reference, String, Unicode
The static String.fromCharCode() method returns a string created by using the specified sequence of Unicode values.
616 String.fromCodePoint() ECMAScript6, JavaScript, Method, Reference, String
The static String.fromCodePoint() method returns a string created by using the specified sequence of code points.
617 String.prototype JavaScript, Property, Prototype, Reference, String
The String.prototype property represents the String prototype object.
618 String.prototype.anchor() HTML wrapper methods, JavaScript, Method, Prototype, Reference, String
The anchor() method creates an <a> HTML anchor element that is used as a hypertext target.
619 String.prototype.big() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String
The big() method creates a <big> HTML element that causes a string to be displayed in a big font.
620 String.prototype.blink() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String, prototype
The blink() method creates a <blink> HTML element that causes a string to blink.
621 String.prototype.bold() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String
The bold() method creates a <b> HTML element that causes a string to be displayed as bold.
622 String.prototype.charAt() JavaScript, Method, Prototype, Reference, String
The charAt() method returns the specified character from a string.
623 String.prototype.charCodeAt() JavaScript, Method, Reference, String, Unicode
The charCodeAt() method returns an integer between 0 and 65535 representing the UTF-16 code unit at the given index (the UTF-16 code unit matches the Unicode code point for code points representable in a single UTF-16 code unit, but might also be the first code unit of a surrogate pair for code points not representable in a single UTF-16 code unit, e.g. Unicode code points > 0x10000). If you want the entire code point value, use codePointAt().
624 String.prototype.codePointAt() ECMAScript6, JavaScript, Method, Prototype, Reference, String
The codePointAt() method returns a non-negative integer that is the Unicode code point value.
625 String.prototype.concat() JavaScript, Method, Prototype, Reference, String
The concat() method combines the text of one or more strings and returns a new string.
626 String.prototype.endsWith() JavaScript, Method, Prototype, Reference, String
The endsWith() method determines whether a string ends with the characters of another string, returning true or false as appropriate.
627 String.prototype.fixed() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String, prototype
The fixed() method creates a <tt> HTML element that causes a string to be displayed in fixed-pitch font.
628 String.prototype.fontcolor() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String, prototype
The fontcolor() method creates a <font> HTML element that causes a string to be displayed in the specified font color.
629 String.prototype.fontsize() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String, prototype
The fontsize() method creates a <font> HTML element that causes a string to be displayed in the specified font size.
630 String.prototype.includes() JavaScript, Method, Prototype, Reference, String
The includes() method determines whether one string may be found within another string, returning true or false as appropriate.
631 String.prototype.indexOf() JavaScript, Method, Prototype, Reference, String
The indexOf() method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex. Returns -1 if the value is not found.
632 String.prototype.italics() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, String, prototype
The italics() method creates an <i> HTML element that causes a string to be italic.
633 String.prototype.lastIndexOf() JavaScript, Method, Prototype, Reference, String
The lastIndexOf() method returns the index within the calling String object of the last occurrence of the specified value, searching backwards from fromIndex. Returns -1 if the value is not found.
634 String.prototype.link() HTML wrapper methods, JavaScript, Method, Prototype, Reference, String
The link() method creates a string representing the code for an <a> HTML element to be used as a hypertext link to another URL.
635 String.prototype.localeCompare() Internationalization, JavaScript, Method, Prototype, Reference, String
The localeCompare() method returns a number indicating whether a reference string comes before or after or is the same as the given string in sort order.
636 String.prototype.match() JavaScript, Method, Prototype, Reference, Regular Expressions, String
The match() method retrieves the matches when matching a string against a regular expression.
637 String.prototype.normalize() ECMAScript6, JavaScript, Method, Prototype, Reference, String, Unicode
The normalize() method returns the Unicode Normalization Form of a given string (if the value isn't a string, it will be converted to one first).
638 String.prototype.padEnd() Experimental, JavaScript, Method, Reference, String
The padEnd() method pads the current string with a given string (possibly repeated) so that the resulting string reaches a given length. The padding is applied from the end (right) of the current string.
639 String.prototype.padStart() Experimental, JavaScript, Method, Reference, String
The padStart() method pads the current string with a given string (eventually repeated) so that the resulting string reaches a given length. The pad is applied from the start (left) of the current string.
640 String.prototype.quote() JavaScript, Method, Obsolete, Prototype, Reference, String, prototype
The non-standard quote() method returns a copy of the string, replacing various special characters in the string with their escape sequences and wrapping the result in double-quotes (").
641 String.prototype.repeat() ECMAScript6, JavaScript, Method, Prototype, Reference, String
The repeat() method constructs and returns a new string which contains the specified number of copies of the string on which it was called, concatenated together.
642 String.prototype.replace() Expressions, JavaScript, Method, Prototype, Reference, Regular, String
The replace() method returns a new string with some or all matches of a pattern replaced by a replacement. The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match.
643 String.prototype.search() JavaScript, Method, Prototype, Reference, Regular Expressions, String
The search() method executes a search for a match between a regular expression and this String object.
644 String.prototype.slice() JavaScript, Method, Prototype, Reference, String
The slice() method extracts a section of a string and returns a new string.
645 String.prototype.small() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String, prototype
The small() method creates a <small> HTML element that causes a string to be displayed in a small font.
646 String.prototype.split() JavaScript, Method, Prototype, Reference, Regular Expressions, String
The split() method splits a String object into an array of strings by separating the string into substrings.
647 String.prototype.startsWith() ECMAScript6, JavaScript, Method, Prototype, Reference, String
The startsWith() method determines whether a string begins with the characters of another string, returning true or false as appropriate.
648 String.prototype.strike() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, String, prototype
The strike() method creates a <strike> HTML element that causes a string to be displayed as struck-out text.
649 String.prototype.sub() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, String, prototype
The sub() method creates a <sub> HTML element that causes a string to be displayed as subscript.
650 String.prototype.substr() JavaScript, Method, Prototype, Reference, String
Technical review completed.
651 String.prototype.substring() JavaScript, Method, Prototype, Reference, String
The substring() method returns a subset of a string between one index and another, or through the end of the string.
652 String.prototype.sup() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String
The sup() method creates a <sup> HTML element that causes a string to be displayed as superscript.
653 String.prototype.toLocaleLowerCase() Internationalization, JavaScript, Method, Prototype, Reference, String, prototype
The toLocaleLowerCase() method returns the calling string value converted to lower case, according to any locale-specific case mappings.
654 String.prototype.toLocaleUpperCase() Internationalization, JavaScript, Method, Prototype, Reference, String, prototype
The toLocaleUpperCase() method returns the calling string value converted to upper case, according to any locale-specific case mappings.
655 String.prototype.toLowerCase() JavaScript, Method, Prototype, Reference, String
The toLowerCase() method returns the calling string value converted to lower case.
656 String.prototype.toSource() JavaScript, Method, Non-Standard, Non-standard, Prototype, Reference, String, prototype
The toSource() method returns a string representing the source code of the object.
657 String.prototype.toString() JavaScript, Method, Prototype, Reference, String, prototype
The toString() method returns a string representing the specified object.
658 String.prototype.toUpperCase() JavaScript, Method, Prototype, Reference, String
The toUpperCase() method returns the calling string value converted to upper case.
659 String.prototype.trim() ECMAScript5, JavaScript, Method, Prototype, Reference, String
The trim() method removes whitespace from both ends of a string. Whitespace in this context is all the whitespace characters (space, tab, no-break space, etc.) and all the line terminator characters (LF, CR, etc.).
660 String.prototype.trimLeft() JavaScript, Method, Prototype, Reference, String
The trimLeft() method removes whitespace from the left end of a string.
661 String.prototype.trimRight() JavaScript, Method, Prototype, Reference, String
The trimRight() method removes whitespace from the right end of a string.
662 String.prototype.valueOf() JavaScript, Method, Prototype, Reference, String
The valueOf() method returns the primitive value of a String object.
663 String.prototype[@@iterator]() ECMAScript6, Iterator, JavaScript, Method, Prototype, Reference, String, prototype
The [@@iterator]() method returns a new Iterator object that iterates over the code points of a String value, returning each code point as a String value.
664 String.raw() ECMAScript6, JavaScript, Method, Reference, String
The static String.raw() method is a tag function of template literals, similar to the r prefix in Python or the @ prefix in C# for string literals (yet there is a difference: see explanations in this issue). It's used to get the raw string form of template strings (that is, the original, uninterpreted text).
665 string.length JavaScript, Property, Prototype, Reference, String
The length property represents the length of a string.
666 Symbol ECMAScript6, JavaScript, Symbol
A symbol is a unique and immutable data type. It may be used as an identifier for object properties. The Symbol object is an implicit object wrapper for the symbol primitive data type.
667 Symbol.for() ECMAScript6, JavaScript, Method, Symbol
The Symbol.for(key) method searches for existing symbols in a runtime-wide symbol registry with the given key and returns it if found. Otherwise a new symbol gets created in the global symbol registry with this key.
668 Symbol.hasInstance ECMAScript6, JavaScript, Property, Reference, Symbol
The Symbol.hasInstance well-known symbol is used to determine if a constructor object recognizes an object as its instance. The instanceof operator's behavior can be customized by this symbol.
669 Symbol.isConcatSpreadable ECMAScript6, JavaScript, Property, Symbol
The Symbol.isConcatSpreadable well-known symbol is used to configure if an object should be flattened to its array elements when using the Array.prototype.concat() method.
670 Symbol.iterator ECMAScript6, JavaScript, Property, Symbol
The Symbol.iterator well-known symbol specifies the default iterator for an object. Used by for...of.
671 Symbol.keyFor() ECMAScript6, JavaScript, Method, Symbol
The Symbol.keyFor(sym) method retrieves a shared symbol key from the global symbol registry for the given symbol.
672 Symbol.match ECMAScript6, JavaScript, Property, Symbol
The Symbol.match well-known symbol specifies the matching of a regular expression against a string. This function is called by the String.prototype.match() method.
673 Symbol.prototype JavaScript, Property, Symbol
The Symbol.prototype property represents the prototype for the Symbol constructor.
674 Symbol.prototype.toSource() JavaScript, Method, Prototype, Symbol, prototype
The toSource() method returns a string representing the source code of the object.
675 Symbol.prototype.toString() ECMAScript6, JavaScript, Method, Prototype, Symbol, prototype
The toString() method returns a string representing the specified Symbol object.
676 Symbol.prototype.valueOf() ECMAScript6, JavaScript, Method, Prototype, Symbol, prototype
The valueOf() method returns the primitive value of a Symbol object.
677 Symbol.prototype[@@toPrimitive] ECMAScript6, JavaScript, Method, Prototype, Symbol, prototype
The [@@toPrimitive]() method converts a Symbol object to a primitive value.
678 Symbol.replace ECMAScript6, JavaScript, Property, Symbol
The Symbol.replace well-known symbol specifies the method that replaces matched substrings of a string. This function is called by the String.prototype.replace() method.
679 Symbol.search ECMAScript6, JavaScript, Property, Symbol
The Symbol.search well-known symbol specifies the method that returns the index within a string that matches the regular expression. This function is called by the String.prototype.search() method.
680 Symbol.species ECMAScript6, JavaScript, Property, Symbol
The Symbol.species well-known symbol specifies a function valued property that is the constructor function that is used to create derived objects.
681 Symbol.split ECMAScript6, JavaScript, Property, Symbol
The Symbol.split well-known symbol specifies the method that splits a string at the indices that match a regular expression. This function is called by the String.prototype.split() method.
682 Symbol.toPrimitive ECMAScript6, JavaScript, Property, Symbol
The Symbol.toPrimitive is a symbol that specifies a function valued property that is called to convert an object to a corresponding primitive value.
683 Symbol.toStringTag ECMAScript6, JavaScript, Property, Reference, Symbol
The Symbol.toStringTag well-known symbol is a string valued property that is used in the creation of the default string description of an object. It is accessed internally by the Object.prototype.toString() method.
684 Symbol.unscopables ECMAScript6, JavaScript, Property, Symbol
The Symbol.unscopables well-known symbol is used to specify an object value of whose own and inherited property names are excluded from the with environment bindings of the associated object.
685 SyntaxError Error, JavaScript, Object, Reference, SyntaxError
The SyntaxError object represents an error when trying to interpret syntactically invalid code.
686 SyntaxError.prototype Error, JavaScript, Property, Prototype, SyntaxError
The SyntaxError.prototype property represents the prototype for the SyntaxError constructor.
687 TypeError Error, JavaScript, Object, Reference, TypeError
The TypeError object represents an error when a value is not of the expected type.
688 TypeError.prototype Error, JavaScript, Property, Prototype, TypeError, prototype
The TypeError.prototype property represents the prototype for the TypeError constructor.
689 TypedArray JavaScript, TypedArray, TypedArrays
A TypedArray object describes an array-like view of an underlying binary data buffer. There is no global property named TypedArray, nor is there a directly visible TypedArray constructor.  Instead, there are a number of different global properties, whose values are typed array constructors for specific element types, listed below. On the following pages you will find common properties and methods that can be used with any typed array containing elements of any type.
690 TypedArray.BYTES_PER_ELEMENT JavaScript, Property, TypedArray, TypedArrays
The TypedArray.BYTES_PER_ELEMENT property represents the size in bytes of each element in an typed array.
691 TypedArray.from() ECMAScript6, JavaScript, Method, TypedArray, TypedArrays
The TypedArray.from() method creates a new typed array from an array-like or iterable object. This method is nearly the same as Array.from().
692 TypedArray.name JavaScript, Property, TypedArray, TypedArrays
The TypedArray.name property represents a string value of the typed array constructor name.
693 TypedArray.of() ECMAScript6, JavaScript, Method, TypedArray, TypedArrays
The TypedArray.of() method creates a new typed array with a variable number of arguments. This method is nearly the same as Array.of().
694 TypedArray.prototype JavaScript, Property, TypedArray, TypedArrays
The TypedArray.prototype property represents the prototype for TypedArray constructors.
695 TypedArray.prototype.buffer JavaScript, Property, Prototype, TypedArray, TypedArrays, prototype
The buffer accessor property represents the ArrayBuffer referenced by a TypedArray at construction time.
696 TypedArray.prototype.byteLength JavaScript, Property, Prototype, TypedArray, TypedArrays, prototype
The byteLength accessor property represents the length (in bytes) of a typed array.
697 TypedArray.prototype.byteOffset JavaScript, Property, Prototype, TypedArray, TypedArrays, prototype
The byteOffset accessor property represents the offset (in bytes) of a typed array from the start of its ArrayBuffer.
698 TypedArray.prototype.copyWithin() JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
The copyWithin() method copies the sequence of array elements within the array to the position starting at target. The copy is taken from the index positions of the second and third arguments start and end. The end argument is optional and defaults to the length of the array. This method has the same algorithm as Array.prototype.copyWithin. TypedArray is one of the typed array types here.
699 TypedArray.prototype.entries() ECMAScript6, Iterator, JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays, prototype
The entries() method returns a new Array Iterator object that contains the key/value pairs for each index in the array.
700 TypedArray.prototype.every() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
The every() method tests whether all elements in the typed array pass the test implemented by the provided function. This method has the same algorithm as Array.prototype.every(). TypedArray is one of the typed array types here.
701 TypedArray.prototype.fill() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
The fill() method fills all the elements of a typed array from a start index to an end index with a static value. This method has the same algorithm as Array.prototype.fill(). TypedArray is one of the typed array types here.
702 TypedArray.prototype.filter() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
The filter() method creates a new typed array with all elements that pass the test implemented by the provided function. This method has the same algorithm as Array.prototype.filter(). TypedArray is one of the typed array types here.
703 TypedArray.prototype.find() ECMAScript6, JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays, prototype
The find() method returns a value in the typed array, if an element satisfies the provided testing function. Otherwise undefined is returned. TypedArray is one of the typed array types here.
704 TypedArray.prototype.findIndex() ECMAScript6, JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays, prototype
The findIndex() method returns an index in the typed array, if an element in the typed array satisfies the provided testing function. Otherwise -1 is returned.
705 TypedArray.prototype.forEach() ECMAScript6, JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays
The forEach() method executes a provided function once per array element. This method has the same algorithm as Array.prototype.forEach(). TypedArray is one of the typed array types here.
706 TypedArray.prototype.includes() ECMAScript7, JavaScript, Method, Prototype, TypedArray, TypedArrays
The includes() method determines whether a typed array includes a certain element, returning true or false as appropriate. This method has the same algorithm as Array.prototype.includes(). TypedArray is one of the typed array types here.
707 TypedArray.prototype.indexOf() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays
The indexOf() method returns the first index at which a given element can be found in the typed array, or -1 if it is not present. This method has the same algorithm as Array.prototype.indexOf(). TypedArray is one of the typed array types here.
708 TypedArray.prototype.join() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays
The join() method joins all elements of an array into a string. This method has the same algorithm as Array.prototype.join(). TypedArray is one of the typed array types here.
709 TypedArray.prototype.keys() ECMAScript6, Iterator, JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays
The keys() method returns a new Array Iterator object that contains the keys for each index in the array.
710 TypedArray.prototype.lastIndexOf() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays
The lastIndexOf() method returns the last index at which a given element can be found in the typed array, or -1 if it is not present. The typed array is searched backwards, starting at fromIndex. This method has the same algorithm as Array.prototype.lastIndexOf(). TypedArray is one of the typed array types here.
711 TypedArray.prototype.length JavaScript, Property, Prototype, TypedArray, TypedArrays, prototype
The length accessor property represents the length (in elements) of a typed array.
712 TypedArray.prototype.map() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays
The map() method creates a new typed array with the results of calling a provided function on every element in this typed array. This method has the same algorithm as Array.prototype.map(). TypedArray is one of the typed array types here.
713 TypedArray.prototype.move() JavaScript, Method, Obsolete, Prototype, TypedArray, prototype
The move() method used to copy the sequence of array elements within the array to the position starting at target. However, this non-standard method has been replaced with the standard TypedArray.prototype.copyWithin() method. TypedArray is one of the typed array types here.
714 TypedArray.prototype.reduce() JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays
The reduce() method applies a function against an accumulator and each value of the typed array (from left-to-right) has to reduce it to a single value. This method has the same algorithm as Array.prototype.reduce(). TypedArray is one of the typed array types here.
715 TypedArray.prototype.reduceRight() JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays
The reduceRight() method applies a function against an accumulator and each value of the typed array (from right-to-left) has to reduce it to a single value. This method has the same algorithm as Array.prototype.reduceRight(). TypedArray is one of the typed array types here.
716 TypedArray.prototype.reverse() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays
The reverse() method reverses a typed array in place. The first typed array element becomes the last and the last becomes the first. This method has the same algorithm as Array.prototype.reverse(). TypedArray is one of the typed array types here.
717 TypedArray.prototype.set() JavaScript, Method, Prototype, TypedArray, TypedArrays
The set() method stores multiple values in the typed array, reading input values from a specified array.
718 TypedArray.prototype.slice() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays
The slice() method returns a shallow copy of a portion of a typed array into a new typed array object. This method has the same algorithm as Array.prototype.slice(). TypedArray is one of the typed array types here.
719 TypedArray.prototype.some() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays
The some() method tests whether some element in the typed array passes the test implemented by the provided function. This method has the same algorithm as Array.prototype.some(). TypedArray is one of the typed array types here.
720 TypedArray.prototype.sort() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays
The sort() method sorts the elements of a typed array in place and returns the typed array. This method has the same algorithm as Array.prototype.sort(). TypedArray is one of the typed array types here.
721 TypedArray.prototype.subarray() JavaScript, Method, Prototype, TypedArray, TypedArrays
The subarray() method returns a new TypedArray on the same ArrayBuffer store and with the same element types as for this TypedArray object. The begin offset is inclusive and the end offset is exclusive. TypedArray is one of the typed array types.
722 TypedArray.prototype.toLocaleString() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays
The toLocaleString() method returns a string representing the elements of the typed array. The elements are converted to strings and are separated by a locale-specific string (such as a comma “,”). This method has the same algorithm as Array.prototype.toLocaleString() and, as the typed array elements are numbers, the same algorithm as Number.prototype.toLocaleString() applies for each element. TypedArray is one of the typed array types here.
723 TypedArray.prototype.toString() ECMAScript6, JavaScript, Method, Prototype, TypedArray
The toString() method returns a string representing the specified array and its elements. This method has the same algorithm as Array.prototype.toString(). TypedArray is one of the typed array types here.
724 TypedArray.prototype.values() ECMAScript6, Iterator, JavaScript, Method, Prototype, TypedArray, TypedArrays
The values() method returns a new Array Iterator object that contains the values for each index in the array.
725 TypedArray.prototype[@@iterator]() Iterator, JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays, prototype
The initial value of the @@iterator property is the same function object as the initial value of the values property.
726 get TypedArray[@@species] JavaScript, Property, Prototype, TypedArray, TypedArrays
The TypedArray[@@species] accessor property returns the constructor of a typed array.
727 URIError Error, JavaScript, Object, Reference, URIError
The URIError object represents an error when a global URI handling function was used in a wrong way.
728 URIError.prototype Error, JavaScript, Property, Prototype, URIError
The URIError.prototype property represents the prototype for the URIError constructor.
729 Uint16Array Constructor, JavaScript, TypedArray, TypedArrays, Uint16Array
The Uint16Array typed array represents an array of 16-bit unsigned integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
730 Uint32Array Constructor, JavaScript, TypedArray, TypedArrays
The Uint32Array typed array represents an array of 32-bit unsigned integers in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
731 Uint8Array Constructor, JavaScript, TypedArray, TypedArrays, Uint8Array
The Uint8Array typed array represents an array of 8-bit unsigned integers. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
732 Uint8ClampedArray Constructor, JavaScript, TypedArray, TypedArrays, Uint8ClampedArray
The Uint8ClampedArray typed array represents an array of 8-bit unsigned integers clamped to 0-255; if you specified a value that is out of the range of [0,255], 0 or 255 will be set instead. The contents are initialized to 0. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
733 WeakMap ECMAScript6, JavaScript, WeakMap
The WeakMap object is a collection of key/value pairs in which the keys are weakly referenced.  The keys must be objects and the values can be arbitrary values.
734 WeakMap.prototype ECMAScript6, JavaScript, Property, WeakMap
The WeakMap.prototype property represents the prototype for the WeakMap constructor.
735 WeakMap.prototype.clear() JavaScript, Method, Obsolete, Prototype, WeakMap
The clear() method used to remove all elements from a WeakMap object, but is no longer part of ECMAScript and its implementations.
736 WeakMap.prototype.delete() ECMAScript6, JavaScript, Method, Prototype, WeakMap
The delete() method removes the specified element from a WeakMap object.
737 WeakMap.prototype.get() ECMAScript6, JavaScript, Method, Prototype, WeakMap
The get() method returns a specified element from a WeakMap object.
738 WeakMap.prototype.has() ECMAScript6, JavaScript, Method, Prototype, WeakMap
The has() method returns a boolean indicating whether an element with the specified key exists in the WeakMap object or not.
739 WeakMap.prototype.set() ECMAScript6, JavaScript, Method, Prototype, WeakMap
The set() method adds a new element with a specified key and value to a WeakMap object.
740 WeakSet ECMAScript6, JavaScript, WeakSet
The WeakSet object lets you store weakly held objects in a collection.
741 WeakSet.prototype ECMAScript6, JavaScript, Property, WeakSet
The WeakSet.prototype property represents the prototype for the WeakSet constructor.
742 WeakSet.prototype.add() ECMAScript6, JavaScript, Method, Prototype, WeakSet
The add() method appends a new object to the end of a WeakSet object.
743 WeakSet.prototype.clear() JavaScript, Method, Obsolete, Prototype, WeakSet
The clear() method used to remove all elements from a WeakSet object, but is no longer part of ECMAScript and its implementations.
744 WeakSet.prototype.delete() ECMAScript6, JavaScript, Method, Prototype, WeakSet
The delete() method removes the specified element from a WeakSet object.
745 WeakSet.prototype.has() ECMAScript6, JavaScript, Method, Prototype, WeakSet, prototype
The has() method returns a boolean indicating whether an object exists in a WeakSet or not.
746 decodeURI() JavaScript
The decodeURI() function decodes a Uniform Resource Identifier (URI) previously created by encodeURI or by a similar routine.
747 decodeURIComponent() JavaScript
The decodeURIComponent() function decodes a Uniform Resource Identifier (URI) component previously created by encodeURIComponent or by a similar routine.
748 encodeURI() JavaScript, URI
The encodeURI() function encodes a Uniform Resource Identifier (URI) by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character (will only be four escape sequences for characters composed of two "surrogate" characters).
749 encodeURIComponent() JavaScript, URI
The encodeURIComponent() function encodes a Uniform Resource Identifier (URI) component by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character (will only be four escape sequences for characters composed of two "surrogate" characters).
750 escape() Deprecated, JavaScript
The deprecated escape() function computes a new string in which certain characters have been replaced by a hexadecimal escape sequence. Use encodeURI or encodeURIComponent instead.
751 eval() JavaScript
The eval() function evaluates JavaScript code represented as a string.
752 isFinite() JavaScript
The global isFinite() function determines whether the passed value is a finite number. If needed, the parameter is first converted to a number.
753 isNaN() JavaScript
The isNaN() function determines whether a value is NaN or not. Note: coercion inside the isNaN function has interesting rules; you may alternatively want to use Number.isNaN(), as defined in ECMAScript 6, or you can use typeof to determine if the value is Not-A-Number.
754 null JavaScript, Literal, Primitive
The value null represents the intentional absence of any object value. It is one of JavaScript's primitive values.
755 parseFloat() JavaScript
The parseFloat() function parses a string argument and returns a floating point number.
756 parseInt() JavaScript
The parseInt() function parses a string argument and returns an integer of the specified radix (the base in mathematical numeral systems).
757 undefined JavaScript
The global undefined property represents the primitive value undefined. It is one of JavaScript's primitive types.
758 unescape() Deprecated, JavaScript
The deprecated unescape() function computes a new string in which hexadecimal escape sequences are replaced with the character that it represents. The escape sequences might be introduced by a function like escape. Because unescape is deprecated, use decodeURI or decodeURIComponent instead.
759 uneval() JavaScript
The uneval() function creates a string representation of the source code of an Object.
760 Statements and declarations JavaScript, Reference, statements
JavaScript applications consist of statements with an appropriate syntax. A single statement may span multiple lines. Multiple statements may occur on a single line if each statement is separated by a semicolon. This isn't a keyword, but a group of keywords.
761 Legacy generator function JavaScript, Legacy Iterator, Reference
The legacy generator function statement declares legacy generator functions with the specified parameters.
762 async function Experimental, Function, JavaScript, NeedsContent, Statement
The async function declaration defines a async function, which returns a AsyncFunction object.
763 block JavaScript, Reference, Statement
A block statement (or compound statement in other languages) is used to group zero or more statements. The block is delimited by a pair of curly brackets.
764 break JavaScript, Statement
The break statement terminates the current loop, switch, or label statement and transfers program control to the statement following the terminated statement.
765 class Classes, Declaration, ECMAScript6, JavaScript, Ref, Statement
The class declaration creates a new class with a given name using prototype-based inheritance.
766 const ECMAScript6, JavaScript, Reference, Statement, constants
This declaration creates a constant that can be either global or local to the function in which it is declared. An initializer for a constant is required; that is, you must specify its value in the same statement in which it's declared (which makes sense, given that it can't be changed later).
767 continue JavaScript, Statement
The continue statement terminates execution of the statements in the current iteration of the current or labeled loop, and continues execution of the loop with the next iteration.
768 debugger JavaScript, Statement
The debugger statement invokes any available debugging functionality, such as setting a breakpoint. If no debugging functionality is available, this statement has no effect.
769 default JavaScript, Keyword
Technical review completed.
770 do...while JavaScript, Statement
The do...while statement creates a loop that executes a specified statement until the test condition evaluates to false. The condition is evaluated after executing the statement, resulting in the specified statement executing at least once.
771 empty JavaScript, Statement
An empty statement is used to provide no statement, although the JavaScript syntax would expect one.
772 export ECMAScript6, JavaScript, Statement
The export statement is used to export functions, objects or primitives from a given file (or module).
773 for JavaScript, Loop, Statement, for
The for statement creates a loop that consists of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a statement (usually a block statement) to be executed in the loop.
774 for each...in Deprecated, E4X, JavaScript, Statement
The for each...in statement iterates a specified variable over all values of object's properties. For each distinct property, a specified statement is executed.
775 for...in JavaScript, Statement
The for...in statement iterates over the enumerable properties of an object, in arbitrary order. For each distinct property, statements can be executed.
776 for...of ECMAScript6, JavaScript, Statement
The for...of statement creates a loop iterating over iterable objects (including Array, Map, Set, String, TypedArray, arguments object and so on), invoking a custom iteration hook with statements to be executed for the value of each distinct property.
777 function JavaScript, Statement
The function declaration defines a function with the specified parameters.
778 function* ECMAScript6, Function, Iterator, JavaScript, Statement
The function* declaration (function keyword followed by an asterisk) defines a generator function, which returns a Generator object.
779 if...else JavaScript, Statement
The if statement executes a statement if a specified condition is true. If the condition is false, another statement can be executed.
780 import ECMAScript6, JavaScript, Modules, Statement
The import statement is used to import functions, objects or primitives that have been exported from an external module, another script, etc.
781 label JavaScript, Statement
The labeled statement can be used with break or continue statements. It is prefixing a statement with an identifier which you can refer to.
782 let ECMAScript 2015, ECMAScript6, JavaScript, Statement, Variable declaration, Variables, let
The let statement declares a block scope local variable, optionally initializing it to a value.
783 return JavaScript, Statement
The return statement ends function execution and specifies a value to be returned to the function caller.
784 switch JavaScript, Reference, Statement, Web
The switch statement evaluates an expression, matching the expression's value to a case clause, and executes statements associated with that case.
785 throw JavaScript, Statement
The throw statement throws a user-defined exception. Execution of the current function will stop (the statements after throw won't be executed), and control will be passed to the first catch block in the call stack. If no catch block exists among caller functions, the program will terminate.
786 try...catch Error, Exception, JavaScript, Statement
The try...catch statement marks a block of statements to try, and specifies a response, should an exception be thrown.
787 var JavaScript, Statement
The variable statement declares a variable, optionally initializing it to a value.
788 while JavaScript, Statement
The while statement creates a loop that executes a specified statement as long as the test condition evaluates to true. The condition is evaluated before executing the statement.
789 with Deprecated, JavaScript, Statement
The with statement extends the scope chain for a statement.
790 Strict mode ECMAScript5, JavaScript, Strict Mode
ECMAScript 5's strict mode is a way to opt in to a restricted variant of JavaScript. Strict mode isn't just a subset: it intentionally has different semantics from normal code. Browsers not supporting strict mode will run strict mode code with different behavior from browsers that do, so don't rely on strict mode without feature-testing for support for the relevant aspects of strict mode. Strict mode code and non-strict mode code can coexist, so scripts can opt into strict mode incrementally.
791 Transitioning to strict mode Advanced, JavaScript
ECMAScript 5 introduced strict mode which is now implemented in all major browsers (including IE10). While making web browsers interpret code as strict is easy (just add "use strict"; at the top of your source code), transitioning an existing code base to strict mode requires a bit more work.
792 Template literals ECMAScript6, JavaScript, Template Strings, Template literals
Template literals are string literals allowing embedded expressions. You can use multi-line strings and string interpolation features with them. They were called "template strings" in prior editions of the ES2015 / ES6 specification.
793 JavaScript shells Extensions, JavaScript, Tools
A JavaScript shell allows you to quickly test snippets of JavaScript code without having to reload a web page. They are extremely useful for developing and debugging code.
794 JavaScript technologies overview Beginner, DOM, JavaScript
Whereas HTML defines a webpage's structure and content and CSS sets the formatting and appearance, JavaScript adds interactivity to a webpage and creates rich web applications.
795 JavaScript typed arrays Guide, JavaScript
JavaScript typed arrays are array-like objects and provide a mechanism for accessing raw binary data. As you may already know, Array objects grow and shrink dynamically and can have any JavaScript value. JavaScript engines perform optimizations so that these arrays are fast. However, as web applications become more and more powerful, adding features such as audio and video manipulation, access to raw data using WebSockets, and so forth, it has become clear that there are times when it would be helpful for JavaScript code to be able to quickly and easily manipulate raw binary data in typed arrays.
796 Memory Management JavaScript, Performance, memory, performance
Low-level languages, like C, have low-level memory management primitives like malloc() and free(). On the other hand, JavaScript values are allocated when things (objects, strings, etc.) are created and "automatically" freed when they are not used anymore. The latter process is called garbage collection. This "automatically" is a source of confusion and gives JavaScript (and high-level languages) developers the impression they can decide not to care about memory management. This is a mistake.
797 New in JavaScript JavaScript, Versions
This chapter contains information about JavaScript's version history and implementation status for Mozilla/SpiderMonkey-based JavaScript applications, such as Firefox.
798 ECMAScript 5 support in Mozilla ECMAScript5, JavaScript, Versions
ECMAScript 5.1, an older version of the standard upon which JavaScript is based, was approved in June 2011.
799 ECMAScript 6 support in Mozilla ECMAScript2015, ECMAScript6, Firefox, JavaScript
ECMAScript 2015 (6th Edition) is the current version of the ECMAScript Language Specification standard. Commonly referred to as "ES6", it defines the standard for the JavaScript implementation in SpiderMonkey, the engine used in Firefox and other Mozilla applications.
800 ECMAScript Next support in Mozilla Firefox, JavaScript
ECMAScript Next refers to new features of the ECMA-262 standard (commonly referred to as JavaScript) introduced after ECMAScript 6 (ES2015). New versions of ECMAScript specifications are released yearly. This year, the ES2016 specification will be released and the ES2017 is the current ECMAScript draft specification.
801 Firefox JavaScript changelog JavaScript, Versions
The following is a changelog for JavaScript features in Firefox releases.
802 New in JavaScript 1.1 JavaScript, Versions
The following is a changelog for JavaScript from Netscape Navigator 2.0 to 3.0. The old Netscape documentation references this as "Features added after version 1". Netscape Navigator 3.0 was released on August 19, 1996. Netscape Navigator 3.0 was the second major version of the browser with JavaScript support.
803 New in JavaScript 1.2 JavaScript, Versions
The following is a changelog for JavaScript from Netscape Navigator 3.0 to 4.0. The old Netscape documentation can be found on archive.org. Netscape Navigator 4.0 was released on June 11, 1997. Netscape Navigator 4.0 was the third major version of the browser with JavaScript support.
804 New in JavaScript 1.3 JavaScript, Versions
The following is a changelog for JavaScript from Netscape Navigator 4.0 to 4.5. The old Netscape documentation can be found on archive.org. Netscape Navigator 4.5 was released on October 19, 1998.
805 New in JavaScript 1.4 JavaScript, Versions
The following is a changelog for JavaScript 1.4, which was only used for Netscape's server side JavaScript released in 1999. The old Netscape documentation can be found on archive.org.
806 New in JavaScript 1.5 JavaScript, Versions
The following is a changelog for JavaScript 1.5. This version was included in Netscape Navigator 6.0 was released on November 14, 2000 and was also used in later versions of Netscape Navigator and Firefox 1.0. You can compare JavaScript 1.5 to JScript version 5.5 and Internet Explorer 5.5, which was released in July 2000. The corresponding ECMA standard is ECMA-262 Edition 3 (from December 1999).
807 New in JavaScript 1.6 JavaScript, Versions
The following is a changelog for JavaScript 1.6. This version was included in Firefox 1.5 (Gecko 1.8), which was released in November 2005. The corresponding ECMA standard is ECMA-262 Edition 3 and ECMAScript for XML (E4X) with some additional features. Several new features were introduced: E4X, several new Array methods, and Array and String generics.
808 New in JavaScript 1.7 JavaScript, Versions
The following is a changelog for JavaScript 1.7. This version was included in Firefox 2 (October 2006).
809 New in JavaScript 1.8 JavaScript, Versions
The following is a changelog for JavaScript 1.8. This version was included in Firefox 3 and is part of Gecko 1.9. See bug 380236 for a tracking development bug for JavaScript 1.8.
810 New in JavaScript 1.8.1 Firefox 3.5, JavaScript, Versions
The following is a changelog for JavaScript 1.8.1. This version was included in Firefox 3.5.
811 New in JavaScript 1.8.5 ECMAScript5, Firefox 4, JavaScript, JavaScript 1.8.5, Versions
The following is a changelog for JavaScript 1.8.5. This version was included in Firefox 4.
812 SIMD types JavaScript, SIMD
The experimental JavaScript SIMD API introduces vector objects that utilize SIMD/SSE instructions on supporting CPUs; SIMD is short for Single Instruction/Multiple Data. SIMD operations are methods that process multiple data with a single instruction. In contrary, scalar operations (SISD) process only one individual data with a single instruction.
813 The performance hazards of [[Prototype]] mutation JavaScript, Performance, performance

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