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Páginas JavaScript en MDN

Este página contiene una lista completa de las páginas JavaScipt en MDN,así como su resumen y sus etiquetas.

Found 754 pages:

# Page Tags and summary
1 JavaScript JavaScript, Landing
JavaScript (JS) is a lightweight, interpreted, programming language with first-class functions. 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 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. In other words, the function defined in the closure 'remembers' the environment in which it was created.
5 Concurrency model and Event Loop Advanced, JavaScript
JavaScript has a concurrency model based on an "event loop". This model is quite different than the model in other languages like C or Java.
6 Enumerability and ownership of properties JavaScript, Javascript, 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
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 remaining 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.
11 JavaScript Guide Guide, JavaScript, guide, l10n:priority
The JavaScript Guide shows you how to use JavaScript and gives an overview of the language. If you want to get started with JavaScript or programming in general, consult the articles in the learning area. 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, beginner
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, guide
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, guide
This chapter introduces how to work with strings and text in JavaScript.
26 Working with objects Beginner, Comparing object, Constructor, Document, Guide, JavaScript, Object, beginner
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 are introduced in ECMAScript 6 and 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, Operator, Reference, operator
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, 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, operator
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, operator
JavaScript has both strict and type–converting comparisons. A strict comparison (e.g., ===) is only true if the operands are of the same type. 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, JavaScript, Javascript, Operator, javascript, operator
The destructuring assignment syntax is a JavaScript expression that makes it possible to extract data from arrays or objects using a syntax that mirrors the construction of array and object literals.
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, Operator, operator
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, 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 operator JavaScript, Javascript, Operator, javascript, operator
The spread operator allows an expression to be expanded in places where multiple arguments (for function calls) or multiple elements (for array literals) are expected.
55 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 the class body only. JavaScript classes are using prototype-based inheritance.
56 delete operator JavaScript, Javascript, Operator, Unary, javascript, operator
The delete operator removes a property from an object.
57 function expression Function, JavaScript, Operator, Primary Expressions, operator
The function keyword can be used to define a function inside an expression.
58 function* expression ECMAScript6, Function, Iterator, JavaScript, Operator, Primary Expression, operator
The function* keyword can be used to define a generator function inside an expression.
59 in operator JavaScript, Operator, Relational Operators, operator
The in operator returns true if the specified property is in the specified object.
60 instanceof JavaScript, Object, Operator, Prototype, Relational Operators, instanceof, operator, prototype
The instanceof operator tests whether an object has in its prototype chain the prototype property of a constructor.
61 new operator JavaScript, Left-hand-side expressions, Operator, 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.
62 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.
63 super Classes, ECMAScript6, JavaScript, Left-hand-side expressions, Operator, operator
The super keyword is used to call functions on an object's parent.
64 this JavaScript, Operator, Primary Expressions, Reference, operator
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.
65 typeof JavaScript, Operator, Unary, operator
The typeof operator returns a string indicating the type of the unevaluated operand.
66 void operator JavaScript, Operator, Unary, operator
The void operator evaluates the given expression and then returns undefined.
67 yield ECMAScript6, Generators, Iterator, JavaScript, Operator, operator
The yield keyword is used to pause and resume a generator function (function* or legacy generator function).
68 yield* ECMAScript6, Generators, Iterable, Iterator, JavaScript, Operator, Reference, operator
The yield* expression is used to delegate to another generator or iterable object.
69 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.
70 Arguments object Functions, JavaScript, Javascript, arguments, javascript
The arguments object is an Array-like object corresponding to the arguments passed to a function.
71 arguments.callee Deprecated, Functions, JavaScript, Property, arguments
The arguments.callee property contains the currently executing function.
72 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.
73 arguments.length Functions, JavaScript, Property, arguments
The arguments.length property contains the number of arguments passed to the function.
74 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.
75 Arrow functions ECMAScript6, Functions, Intermediate, JavaScript, Reference
An arrow function expression has a shorter syntax compared to function expressions and lexically binds the this value (does not bind its own thisargumentssuper, or new.target). Arrow functions are always anonymous.
76 Default parameters ECMAScript6, Functions, JavaScript
Default function parameters allow formal parameters to be initialized with default values if no value or undefined is passed.
77 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.
78 Rest parameters Functions, JavaScript, Rest, Rest parameters
The rest parameter syntax allows us to represent an indefinite number of arguments as an array.
79 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.
80 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.
81 Iteration protocols ECMAScript6, Intermediate, Iterable, Iterator, JavaScript
One addition of ECMAScript 2015 (ES6) is not new syntax or a new built-in, but a protocol. This protocol can be implemented by any object respecting some conventions.
82 JavaScript error reference JavaScript
Errors, errors everywhere.
83 RangeError: argument is not a valid code point Errors, JavaScript, RangeError
RangeError
84 RangeError: invalid array length Errors, JavaScript, RangeError
RangeError
85 RangeError: precision is out of range Errors, JavaScript, RangeError
RangeError
86 RangeError: radix must be an integer Errors, JavaScript, RangeError
RangeError
87 RangeError: repeat count must be less than infinity Errors, JavaScript, RangeError
RangeError
88 RangeError: repeat count must be non-negative Errors, JavaScript, RangeError
RangeError
89 SyntaxError: Malformed formal parameter Errors, JavaScript, SyntaxError
SyntaxError
90 TypeError: "x" is read-only Errors, JavaScript, TypeError
TypeError
91 Warning: unreachable code after return statement JavaScript, Warning
Warning
92 JavaScript methods index JavaScript
This article entails a listing of all JavaScript methods documented on MDN sorted alphabetically.
93 JavaScript properties index JavaScript
This article entails a listing of all JavaScript properties documented on MDN sorted alphabetically.
94 Lexical grammar JavaScript, Lexical Grammar
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.
95 Standard built-in objects JavaScript, Reference, Référence
This chapter documents all of JavaScript's standard, built-in objects, including their methods and properties.
96 Array Array, JavaScript
The JavaScript Array object is a global object that is used in the construction of arrays; which are high-level, list-like objects.
97 Array.from() Array, ECMAScript6, JavaScript, Method, polyfill
The Array.from() method creates a new Array instance from an array-like or iterable object.
98 Array.isArray() Array, ECMAScript5, JavaScript, Method, polyfill
The Array.isArray() method returns true if an object is an array, false if it is not.
99 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.
100 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.
101 Array.prototype Array, JavaScript, Property
The Array.prototype property represents the prototype for the Array constructor.
102 Array.prototype.concat() Array, JavaScript, Method, Prototype, prototype
The concat() method returns a new array comprised of the array on which it is called joined with the array(s) and/or value(s) provided as arguments.
103 Array.prototype.copyWithin() Array, ECMAScript6, JavaScript, Method, Prototype, polyfill, 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.
104 Array.prototype.entries() Array, ECMAScript6, Iterator, JavaScript, Method, Prototype, prototype
The entries() method returns a new Array Iterator object that contains the key/value pairs for each index in the array.
105 Array.prototype.every() Array, ECMAScript5, JavaScript, Method, Prototype, polyfill, prototype
The every() method tests whether all elements in the array pass the test implemented by the provided function.
106 Array.prototype.fill() Array, ECMAScript6, JavaScript, Method, Prototype, polyfill, prototype
The fill() method fills all the elements of an array from a start index to an end index with a static value.
107 Array.prototype.filter() Array, ECMAScript5, JavaScript, Method, Prototype, Reference, polyfill, prototype
The filter() method creates a new array with all elements that pass the test implemented by the provided function.
108 Array.prototype.find() Array, ECMAScript 2015, ECMAScript6, JavaScript, Method, Prototype, polyfill, prototype
The find() method returns a value in the array, if an element in the array satisfies the provided testing function. Otherwise undefined is returned.
109 Array.prototype.findIndex() Array, ECMAScript6, JavaScript, Method, Prototype, polyfill, prototype
The findIndex() method returns an index in the array, if an element in the array satisfies the provided testing function. Otherwise -1 is returned.
110 Array.prototype.forEach() Array, ECMAScript5, JavaScript, Method, Prototype, Reference, prototype
The forEach() method executes a provided function once per array element.
111 Array.prototype.includes() Array, JavaScript, Method, Prototype, Reference, polyfill, prototype
The includes() method determines whether an array includes a certain element, returning true or false as appropriate.
112 Array.prototype.indexOf() Array, JavaScript, Method, Prototype, Reference, polyfill, prototype
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.
113 Array.prototype.join() Array, JavaScript, Method, Prototype, Reference, prototype
The join() method joins all elements of an array into a string.
114 Array.prototype.keys() Array, ECMAScript6, Iterator, JavaScript, Method, Prototype, prototype
The keys() method returns a new Array Iterator that contains the keys for each index in the array.
115 Array.prototype.lastIndexOf() Array, ECMAScript5, JavaScript, Method, Prototype, polyfill, prototype
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.
116 Array.prototype.length Array, JavaScript, Property
The length property represents an unsigned, 32-bit integer that is always numerically greater than the highest index in the array.
117 Array.prototype.map() Array, ECMAScript5, JavaScript, Method, Prototype, polyfill, prototype
The map() method creates a new array with the results of calling a provided function on every element in this array.
118 Array.prototype.pop() Array, JavaScript, Method, Prototype, prototype
The pop() method removes the last element from an array and returns that element.
119 Array.prototype.push() Array, JavaScript, Method, Prototype, Reference, prototype
The push() method adds one or more elements to the end of an array and returns the new length of the array.
120 Array.prototype.reduce() Array, ECMAScript5, JavaScript, Method, Prototype, 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.
121 Array.prototype.reduceRight() Array, ECMAScript5, JavaScript, Method, Prototype, polyfill, prototype
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.
122 Array.prototype.reverse() Array, JavaScript, Method, Prototype, prototype
The reverse() method reverses an array in place. The first array element becomes the last and the last becomes the first.
123 Array.prototype.shift() Array, JavaScript, Method, Prototype, prototype
The shift() method removes the first element from an array and returns that element. This method changes the length of the array.
124 Array.prototype.slice() Array, JavaScript, Method, Prototype, prototype
The slice() method returns a shallow copy of a portion of an array into a new array object.
125 Array.prototype.some() Array, ECMAScript5, JavaScript, Javascript, Method, Prototype, Reference, javascript, prototype
The some() method tests whether some element in the array passes the test implemented by the provided function.
126 Array.prototype.sort() Array, JavaScript, Method, Prototype, 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.
127 Array.prototype.splice() Array, JavaScript, Method, Prototype, Reference, prototype
The splice() method changes the content of an array by removing existing elements and/or adding new elements.
128 Array.prototype.toLocaleString() Array, Internationalization, JavaScript, Method, Prototype, 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 “,”).
129 Array.prototype.toSource() Array, JavaScript, Method, Prototype
The toSource() method returns a string representing the source code of the array.
130 Array.prototype.toString() Array, JavaScript, Method, Prototype, prototype
The toString() method returns a string representing the specified array and its elements.
131 Array.prototype.unshift() Array, JavaScript, Method, Prototype, prototype
The unshift() method adds one or more elements to the beginning of an array and returns the new length of the array.
132 Array.prototype.values() Array, ECMAScript6, Iterator, JavaScript, Method, Prototype, prototype
The values() method returns a new Array Iterator object that contains the values for each index in the array.
133 Array.prototype[@@iterator]() Array, ECMAScript6, Iterator, JavaScript, Method, Prototype, Reference, prototype
The initial value of the @@iterator property is the same function object as the initial value of the values() property.
134 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.
135 ArrayBuffer ArrayBuffer, Constructor, JavaScript, TypedArrays
The ArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer. You can not 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.
136 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.
137 ArrayBuffer.prototype ArrayBuffer, JavaScript, Property
The ArrayBuffer.prototype property represents the prototype for the ArrayBuffer object.
138 ArrayBuffer.prototype.byteLength ArrayBuffer, JavaScript, Property, Prototype, prototype
The byteLength accessor property represents the length of an ArrayBuffer in bytes.
139 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.
140 ArrayBuffer.transfer() ArrayBuffer, Experimental, JavaScript, Method, Reference, TypedArrays
The static ArrayBuffer.transfer() method returns a new ArrayBuffer whose contents are 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.
141 Atomics Atomics, Experimental, JavaScript, Shared Memory
The Atomics object provides atomic operations as static methods. They are used with SharedArrayBuffer objects.
142 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.
143 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.
144 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.
145 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.
146 Atomics.futexWait() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.futexWait() method verifies that a given position in an Int32Array still contains a given value and sleeps awaiting or times out. It returns one of the Atomic value properties OK, NOTEQUAL, or TIMEDOUT.
147 Atomics.futexWake() Atomics, Experimental, JavaScript, Method, Shared Memory
The static Atomics.futexWake() method wakes up some agents that are sleeping in the wait queue.
148 Atomics.futexWakeOrRequeue() Atomics, Experimental, JavaScript, Method, NeedsExample, Shared Memory
The static Atomics.futexWakeOrRequeue() method wakes up some agents that are sleeping in the wait queue and moves other waiting agents to the back of the queue.
149 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.
150 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.
151 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.
152 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.
153 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.
154 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.
155 Boolean Boolean, Constructor, JavaScript
The Boolean object is an object wrapper for a boolean value.
156 Boolean.prototype Boolean, JavaScript, Property, Prototype, prototype
The Boolean.prototype property represents the prototype for the Boolean constructor.
157 Boolean.prototype.toSource() Boolean, JavaScript, Method, Prototype
The toSource() method returns a string representing the source code of the object.
158 Boolean.prototype.toString() Boolean, JavaScript, Method, Prototype, prototype
The toString() method returns a string representing the specified Boolean object.
159 Boolean.prototype.valueOf() Boolean, JavaScript, Method, Prototype, prototype
The valueOf() method returns the primitive value of a Boolean object.
160 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.
161 DataView.prototype DataView, JavaScript, Property
The DataView.prototype property represents the prototype for the DataView object.
162 DataView.prototype.buffer DataView, JavaScript, Property, Prototype, TypedArrays, prototype
The buffer accessor property represents the ArrayBuffer referenced by the DataView at construction time.
163 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.
164 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.
165 DataView.prototype.getFloat32() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The getFloat32() method gets a signed 32-bit float (float) at the specified byte offset from the start of the DataView.
166 DataView.prototype.getFloat64() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The getFloat64() method gets a signed 64-bit float (double) at the specified byte offset from the start of the DataView.
167 DataView.prototype.getInt16() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The getInt16() method gets a signed 16-bit integer (short) at the specified byte offset from the start of the DataView.
168 DataView.prototype.getInt32() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The getInt32() method gets a signed 32-bit integer (long) at the specified byte offset from the start of the DataView.
169 DataView.prototype.getInt8() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The getInt8() method gets a signed 8-bit integer (byte) at the specified byte offset from the start of the DataView.
170 DataView.prototype.getUint16() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The getUint16() method gets an unsigned 16-bit integer (unsigned short) at the specified byte offset from the start of the DataView.
171 DataView.prototype.getUint32() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The getUint32() method gets an unsigned 32-bit integer (unsigned long) at the specified byte offset from the start of the DataView.
172 DataView.prototype.getUint8() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The getUint8() method gets an unsigned 8-bit integer (unsigned byte) at the specified byte offset from the start of the DataView.
173 DataView.prototype.setFloat32() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The setFloat32() method stores a signed 32-bit float (float) value at the specified byte offset from the start of the DataView.
174 DataView.prototype.setFloat64() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The setFloat64() method stores a signed 64-bit float (double) value at the specified byte offset from the start of the DataView.
175 DataView.prototype.setInt16() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The setInt16() method stores a signed 16-bit integer (short) value at the specified byte offset from the start of the DataView.
176 DataView.prototype.setInt32() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The setInt32() method stores a signed 32-bit integer (long) value at the specified byte offset from the start of the DataView.
177 DataView.prototype.setInt8() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The setInt8() method stores a signed 8-bit integer (byte) value at the specified byte offset from the start of the DataView.
178 DataView.prototype.setUint16() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The setUint16() method stores an unsigned 16-bit integer (unsigned short) value at the specified byte offset from the start of the DataView.
179 DataView.prototype.setUint32() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The setUint32() method stores an unsigned 32-bit integer (unsigned long) value at the specified byte offset from the start of the DataView.
180 DataView.prototype.setUint8() DataView, JavaScript, Method, Prototype, TypedArrays, prototype
The setUint8() method stores an unsigned 8-bit integer (byte) value at the specified byte offset from the start of the DataView.
181 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.
182 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.
183 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.
184 Date.parse() Date, JavaScript, Javascript, Method, Reference, javascript
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).
185 Date.prototype Date, JavaScript, Property, Prototype, Reference, prototype
The Date.prototype property represents the prototype for the Date constructor.
186 Date.prototype.getDate() Date, JavaScript, Method, Prototype, Reference, prototype
The getDate() method returns the day of the month for the specified date according to local time.
187 Date.prototype.getDay() Date, JavaScript, Method, Prototype, Reference, prototype
The getDay() method returns the day of the week for the specified date according to local time, where 0 represents Sunday.
188 Date.prototype.getFullYear() Date, JavaScript, Method, Prototype, Reference, prototype
The getFullYear() method returns the year of the specified date according to local time.
189 Date.prototype.getHours() Date, JavaScript, Method, Prototype, Reference, prototype
The getHours() method returns the hour for the specified date, according to local time.
190 Date.prototype.getMilliseconds() Date, JavaScript, Method, Prototype, Reference, prototype
The getMilliseconds() method returns the milliseconds in the specified date according to local time.
191 Date.prototype.getMinutes() Date, JavaScript, Method, Prototype, Reference, prototype
The getMinutes() method returns the minutes in the specified date according to local time.
192 Date.prototype.getMonth() Date, JavaScript, Method, Prototype, Reference, prototype
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).
193 Date.prototype.getSeconds() Date, JavaScript, Method, Prototype, Reference, prototype
The getSeconds() method returns the seconds in the specified date according to local time.
194 Date.prototype.getTime() Date, JavaScript, Method, Prototype, Reference, Référence, prototype
The getTime() method returns the numeric value corresponding to the time for the specified date according to universal time.
195 Date.prototype.getTimezoneOffset() Date, JavaScript, Method, Prototype, Reference, prototype
The getTimezoneOffset() method returns the time-zone offset from UTC, in minutes, for the current locale.
196 Date.prototype.getUTCDate() Date, JavaScript, Method, Prototype, Reference, prototype
The getUTCDate() method returns the day (date) of the month in the specified date according to universal time.
197 Date.prototype.getUTCDay() Date, JavaScript, Method, Prototype, Reference, prototype
The getUTCDay() method returns the day of the week in the specified date according to universal time, where 0 represents Sunday.
198 Date.prototype.getUTCFullYear() Date, JavaScript, Method, Prototype, Reference, prototype
The getUTCFullYear() method returns the year in the specified date according to universal time.
199 Date.prototype.getUTCHours() Date, JavaScript, Method, Prototype, Reference, prototype
The getUTCHours() method returns the hours in the specified date according to universal time.
200 Date.prototype.getUTCMilliseconds() Date, JavaScript, Method, Prototype, Reference, prototype
The getUTCMilliseconds() method returns the milliseconds in the specified date according to universal time.
201 Date.prototype.getUTCMinutes() Date, JavaScript, Method, Prototype, Reference, prototype
The getUTCMinutes() method returns the minutes in the specified date according to universal time.
202 Date.prototype.getUTCMonth() Date, JavaScript, Method, Prototype, Reference, prototype
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).
203 Date.prototype.getUTCSeconds() Date, JavaScript, Method, Prototype, Reference, prototype
The getUTCSeconds() method returns the seconds in the specified date according to universal time.
204 Date.prototype.getYear() Date, Deprecated, JavaScript, Method, Prototype, Reference, prototype
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.
205 Date.prototype.setDate() Date, JavaScript, Method, Prototype, Reference, prototype
The setDate() method sets the day of the Date object relative to the beginning of the currently set month.
206 Date.prototype.setFullYear() Date, JavaScript, Method, Prototype, Reference, prototype
The setFullYear() method sets the full year for a specified date according to local time. Returns new timestamp.
207 Date.prototype.setHours() Date, JavaScript, Method, Prototype, Reference, prototype
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.
208 Date.prototype.setMilliseconds() Date, JavaScript, Method, Prototype, Reference, prototype
The setMilliseconds() method sets the milliseconds for a specified date according to local time.
209 Date.prototype.setMinutes() Date, JavaScript, Method, Prototype, Reference, prototype
The setMinutes() method sets the minutes for a specified date according to local time.
210 Date.prototype.setMonth() Date, JavaScript, Method, Prototype, Reference, prototype
The setMonth() method sets the month for a specified date according to the currently set year.
211 Date.prototype.setSeconds() Date, JavaScript, Method, Prototype, Reference, prototype
The setSeconds() method sets the seconds for a specified date according to local time.
212 Date.prototype.setTime() Date, JavaScript, Method, Prototype, Reference, prototype
The setTime() method sets the Date object to the time represented by a number of milliseconds since January 1, 1970, 00:00:00 UTC.
213 Date.prototype.setUTCDate() Date, JavaScript, Method, Prototype, Reference, prototype
The setUTCDate() method sets the day of the month for a specified date according to universal time.
214 Date.prototype.setUTCFullYear() Date, JavaScript, Method, Prototype, Reference, prototype
The setUTCFullYear() method sets the full year for a specified date according to universal time.
215 Date.prototype.setUTCHours() Date, JavaScript, Method, Prototype, Reference, prototype
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.
216 Date.prototype.setUTCMilliseconds() Date, JavaScript, Method, Prototype, Reference, prototype
The setUTCMilliseconds() method sets the milliseconds for a specified date according to universal time.
217 Date.prototype.setUTCMinutes() Date, JavaScript, Method, Prototype, Reference, prototype
The setUTCMinutes() method sets the minutes for a specified date according to universal time.
218 Date.prototype.setUTCMonth() Date, JavaScript, Method, Prototype, Reference, prototype
The setUTCMonth() method sets the month for a specified date according to universal time.
219 Date.prototype.setUTCSeconds() Date, JavaScript, Method, Prototype, Reference, prototype
The setUTCSeconds() method sets the seconds for a specified date according to universal time.
220 Date.prototype.setYear() Date, Deprecated, JavaScript, Method, Prototype, Reference, prototype
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.
221 Date.prototype.toDateString() Date, JavaScript, Method, Prototype, Reference, prototype
The toDateString() method returns the date portion of a Date object in human readable form in American English.
222 Date.prototype.toGMTString() Date, Deprecated, JavaScript, Method, Prototype, Reference, prototype
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.
223 Date.prototype.toISOString() Date, JavaScript, Method, Prototype, Reference, polyfill, prototype
The toISOString() method returns a string in simplified extended ISO format (ISO 8601), which is always 24 characters long: YYYY-MM-DDTHH:mm:ss.sssZ. The timezone is always zero UTC offset, as denoted by the suffix "Z".
224 Date.prototype.toJSON() Date, JavaScript, Method, Prototype, Reference, prototype
The toJSON() method returns a string representation of the Date object.
225 Date.prototype.toLocaleDateString() Date, Internationalization, JavaScript, Method, Prototype, Reference, prototype
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.
226 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().
227 Date.prototype.toLocaleString() Date, Internationalization, JavaScript, Method, Prototype, Reference, prototype
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.
228 Date.prototype.toLocaleTimeString() Date, Internationalization, JavaScript, Method, Prototype, Reference, prototype
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.
229 Date.prototype.toSource() Date, JavaScript, Method, Prototype, Reference
The toSource() method returns a string representing the source code of the object.
230 Date.prototype.toString() Date, JavaScript, Method, Prototype, Reference, prototype
The toString() method returns a string representing the specified Date object.
231 Date.prototype.toTimeString() Date, JavaScript, Method, Prototype, Reference, prototype
The toTimeString() method returns the time portion of a Date object in human readable form in American English.
232 Date.prototype.toUTCString() Date, JavaScript, Method, Prototype, Reference, prototype
The toUTCString() method converts a date to a string, using the UTC time zone.
233 Date.prototype.valueOf() Date, JavaScript, Method, Prototype, Reference, prototype
The valueOf() method returns the primitive value of a Date object.
234 Date.prototype[@@toPrimitive] Date, JavaScript, Method, Prototype, Reference, prototype
The [@@toPrimitive]() method converts a Date object to a primitive value.
235 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.
236 Error.prototype Error, JavaScript, Property
The Error.prototype property represents the prototype for the Error constructor.
237 Error.prototype.columnNumber Error, JavaScript, Property, Prototype
The columnNumber property contains the column number in the line of the file that raised this error.
238 Error.prototype.fileName Error, JavaScript, Property, Prototype
The fileName property contains the path to the file that raised this error.
239 Error.prototype.lineNumber Error, JavaScript, Property, Prototype, Reference, prototype
The lineNumber property contains the line number in the file that raised this error.
240 Error.prototype.message Error, JavaScript, Property, Prototype, prototype
The message property is a human-readable description of the error.
241 Error.prototype.name Error, JavaScript, Property, Prototype, prototype
The name property represents a name for the type of error. The initial value is "Error".
242 Error.prototype.stack Error, JavaScript, Property, Prototype, Reference, prototype
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.
243 Error.prototype.toSource() Error, JavaScript, Method, Prototype
The toSource() method returns code that could eval to the same error.
244 Error.prototype.toString() Error, JavaScript, Method, Prototype, prototype
The toString() method returns a string representing the specified Error object.
245 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.
246 EvalError.prototype Error, EvalError, JavaScript, Property
The EvalError.prototype property represents the prototype of the EvalError constructor.
247 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).
248 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).
249 Function Constructor, Function, JavaScript
The Function constructor creates a new Function object. In JavaScript every function is actually a Function object.
250 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.
251 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.
252 Function.caller Function, JavaScript, Property
The function.caller property returns the function that invoked the specified function.
253 Function.displayName Function, JavaScript, Property
The function.displayName property returns the display name of the function.
254 Function.length Function, JavaScript, Property
The length property specifies the number of arguments expected by the function.
255 Function.name ECMAScript6, Function, JavaScript, Property
The function.name property returns the name of the function.
256 Function.prototype Function, JavaScript, Property, Prototype, prototype
The Function.prototype property represents the Function prototype object.
257 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).
258 Function.prototype.bind() ECMAScript5, 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.
259 Function.prototype.call() Function, JavaScript, Method
The call() method calls a function with a given this value and arguments provided individually.
260 Function.prototype.isGenerator() Function, JavaScript, Method
The isGenerator() method determines whether or not a function is a generator.
261 Function.prototype.toSource() Function, JavaScript, Method
The toSource() method returns a string representing the source code of the object.
262 Function.prototype.toString() Function, JavaScript, Method, Prototype, prototype
The toString() method returns a string representing the source code of the function.
263 Generator ECMAScript6, Generator, JavaScript, Legacy Generator, Legacy Iterator, Reference
The Generator object is returned by a generator function and it conforms to both the iterator and the Iterable protocol.
264 Generator.prototype.next() ECMAScript6, Generator, JavaScript, Method, Prototype, Reference, prototype
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.
265 Generator.prototype.return() ECMAScript6, Generator, JavaScript, Method, Prototype, Reference, prototype
The return() method returns the given value and finishes the generator.
266 Generator.prototype.throw() ECMAScript6, Generator, JavaScript, Method, Prototype, Reference, prototype
The throw() method throws an error to a generator.
267 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.
268 GeneratorFunction.prototype ECMAScript6, GeneratorFunction, Iterator, JavaScript, Property, Prototype, Reference, prototype
The GeneratorFunction.prototype property represents the GeneratorFunction prototype object.
269 Infinity JavaScript
The global Infinity property is a numeric value representing infinity.
270 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).
271 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).
272 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).
273 InternalError Error, InternalError, JavaScript
The InternalError object indicates an error that occurred internally in the JavaScript engine. For example: "InternalError: too much recursion".
274 InternalError.prototype Error, InternalError, JavaScript, Property
The InternalError.prototype property represents the prototype of the InternalError constructor.
275 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.
276 Intl.Collator Collator, Internationalization, JavaScript
The Intl.Collator object is a constructor for collators, objects that enable language sensitive string comparison.
277 Intl.Collator.prototype Collator, Internationalization, JavaScript, Property, Prototype, prototype
The Intl.Collator.prototype property represents the prototype object for the Intl.Collator constructor.
278 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.
279 Intl.Collator.prototype.resolvedOptions() Collator, Internationalization, JavaScript, Method, Prototype, 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.
280 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.
281 Intl.DateTimeFormat DateTimeFormat, Internationalization, JavaScript
The Intl.DateTimeFormat object is a constructor for objects that enable language sensitive date and time formatting.
282 Intl.DateTimeFormat.prototype DateTimeFormat, Internationalization, JavaScript, Property, Prototype, prototype
The Intl.DateTimeFormat.prototype property represents the prototype object for the Intl.DateTimeFormat constructor.
283 Intl.DateTimeFormat.prototype.format DateTimeFormat, Internationalization, JavaScript, Property, Prototype, 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.
284 Intl.DateTimeFormat.prototype.resolvedOptions() DateTimeFormat, Internationalization, JavaScript, Method, Prototype, 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.
285 Intl.DateTimeFormat.supportedLocalesOf() DateTimeFormat, Internationalization, JavaScript, Method, Prototype, 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.
286 Intl.NumberFormat Internationalization, JavaScript, NumberFormat
The Intl.NumberFormat object is a constructor for objects that enable language sensitive number formatting.
287 Intl.NumberFormat.prototype Internationalization, JavaScript, NumberFormat, Property, Prototype, prototype
The Intl.NumberFormat.prototype property represents the prototype object for the Intl.NumberFormat constructor.
288 Intl.NumberFormat.prototype.format Internationalization, JavaScript, NumberFormat, Property, Prototype, 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.
289 Intl.NumberFormat.prototype.resolvedOptions() Internationalization, JavaScript, Method, NumberFormat, Prototype, 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.
290 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.
291 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.
292 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.
293 JSON.parse() ECMAScript5, JSON, JavaScript, Method, Reference
The JSON.parse() method parses a string as JSON, optionally transforming the value produced by parsing.
294 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.
295 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.
296 Map.prototype ECMAScript6, JavaScript, Map, Property
Technical review completed.
297 Map.prototype.clear() ECMAScript6, JavaScript, Map, Method, Prototype, prototype
The clear() method removes all elements from a Map object.
298 Map.prototype.delete() ECMAScript6, JavaScript, Map, Method, Prototype, prototype
The delete() method removes the specified element from a Map object.
299 Map.prototype.entries() ECMAScript6, Iterator, JavaScript, Map, Method, Prototype, 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.
300 Map.prototype.forEach() ECMAScript6, JavaScript, Map, Method, Prototype, prototype
The forEach() method executes a provided function once per each key/value pair in the Map object, in insertion order.
301 Map.prototype.get() ECMAScript6, JavaScript, Map, Method, Prototype, prototype
The get() method returns a specified element from a Map object.
302 Map.prototype.has() ECMAScript6, JavaScript, Map, Method, Prototype, prototype
The has() method returns a boolean indicating whether an element with the specified key exists or not.
303 Map.prototype.keys() ECMAScript6, Iterator, JavaScript, Map, Method, Prototype, prototype
The keys() method returns a new Iterator object that contains the keys for each element in the Map object in insertion order.
304 Map.prototype.set() ECMAScript6, JavaScript, Map, Method, Prototype, prototype
The set() method adds a new element with a specified key and value to a Map object.
305 Map.prototype.size ECMAScript6, JavaScript, Map, Property
The size accessor property returns the number of elements in a Map object.
306 Map.prototype.values() ECMAScript6, Iterator, JavaScript, Map, Method, Prototype, prototype
The values() method returns a new Iterator object that contains the values for each element in the Map object in insertion order.
307 Map.prototype[@@iterator]() ECMAScript6, Iterator, JavaScript, Map, Method, Prototype, Reference, prototype
The initial value of the @@iterator property is the same function object as the initial value of the entries property.
308 Map.prototype[@@toStringTag] ECMAScript6, JavaScript, Map, Property, Prototype, Reference, prototype
The Map[@@toStringTag] property has an initial value of "Map".
309 get Map[@@species] ECMAScript6, JavaScript, Map, Property
The Map[@@species] accessor property returns the Map constructor.
310 Math JavaScript, Math, Reference
Math is a built-in object that has properties and methods for mathematical constants and functions. Not a function object.
311 Math.E JavaScript, Math, Property, Reference
The Math.E property represents the base of natural logarithms, e, approximately 2.718.
312 Math.LN10 JavaScript, Math, Property, Reference
The Math.LN10 property represents the natural logarithm of 10, approximately 2.302:
313 Math.LN2 JavaScript, Math, Property, Reference
The Math.LN2 property represents the natural logarithm of 2, approximately 0.693:
314 Math.LOG10E JavaScript, Math, Property, Reference
The Math.LOG10E property represents the base 10 logarithm of e, approximately 0.434:
315 Math.LOG2E JavaScript, Math, Property, Reference
The Math.LOG2E property represents the base 2 logarithm of e, approximately 1.442:
316 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:
317 Math.SQRT1_2 JavaScript, Math, Property, Reference
The Math.SQRT1_2 property represents the square root of 1/2 which is approximately 0.707:
318 Math.SQRT2 JavaScript, Math, Property, Reference
The Math.SQRT2 property represents the square root of 2, approximately 1.414:
319 Math.abs() JavaScript, Math, Method, Reference
The Math.abs() function returns the absolute value of a number, that is
320 Math.acos() JavaScript, Math, Method, Reference
The Math.acos() function returns the arccosine (in radians) of a number, that is
321 Math.acosh() JavaScript, Math, Method, Reference
The Math.acosh() function returns the hyperbolic arc-cosine of a number, that is
322 Math.asin() JavaScript, Math, Method, Reference
The Math.asin() function returns the arcsine (in radians) of a number, that is
323 Math.asinh() JavaScript, Math, Method, Reference
The Math.asinh() function returns the hyperbolic arcsine of a number, that is
324 Math.atan() JavaScript, Math, Method, Reference
The Math.atan() function returns the arctangent (in radians) of a number, that is
325 Math.atan2() JavaScript, Math, Method, Reference
The Math.atan2() function returns the arctangent of the quotient of its arguments.
326 Math.atanh() JavaScript, Math, Method, Reference
The Math.atanh() function returns the hyperbolic arctangent of a number, that is
327 Math.cbrt() JavaScript, Math, Method, Reference
The Math.cbrt() function returns the cube root of a number, that is
328 Math.ceil() JavaScript, Math, Method, Reference
The Math.ceil() function returns the smallest integer greater than or equal to a given number.
329 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.
330 Math.cos() JavaScript, Math, Method, Reference
The Math.cos() function returns the cosine of a number.
331 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:
332 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.
333 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.
334 Math.floor() JavaScript, Math, Method, Reference
The Math.floor() function returns the largest integer less than or equal to a given number.
335 Math.fround() JavaScript, Math, Method, Reference
The Math.fround() function returns the nearest single precision float representation of a number.
336 Math.hypot() JavaScript, Math, Method, Reference
The Math.hypot() function returns the square root of the sum of squares of its arguments, that is
337 Math.imul() JavaScript, Math, Method, Reference
The Math.imul() function returns the result of the C-like 32-bit multiplication of the two parameters.
338 Math.log() JavaScript, Math, Method, Reference
The Math.log() function returns the natural logarithm (base e) of a number, that is
339 Math.log10() ECMAScript6, JavaScript, Math, Method, Reference
The Math.log10() function returns the base 10 logarithm of a number, that is
340 Math.log1p() ECMAScript6, JavaScript, Math, Method, Reference
The Math.log1p() function returns the natural logarithm (base e) of 1 + a number, that is
341 Math.log2() ECMAScript6, JavaScript, Math, Method, Reference
The Math.log2() function returns the base 2 logarithm of a number, that is
342 Math.max() JavaScript, Math, Method, Reference
The Math.max() function returns the largest of zero or more numbers.
343 Math.min() JavaScript, Math, Method, Reference
The Math.min() function returns the smallest of zero or more numbers.
344 Math.pow() JavaScript, Math, Method, Reference
The Math.pow() function returns the base to the exponent power, that is, baseexponent.
345 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.
346 Math.round() JavaScript, Math, Method, Reference
The Math.round() function returns the value of a number rounded to the nearest integer.
347 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.
348 Math.sin() JavaScript, Math, Method, Reference
The Math.sin() function returns the sine of a number.
349 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:
350 Math.sqrt() JavaScript, Math, Method, Reference
The Math.sqrt() function returns the square root of a number, that is
351 Math.tan() JavaScript, Math, Method, Reference
The Math.tan() function returns the tangent of a number.
352 Math.tanh() ECMAScript6, JavaScript, Math, Method, Reference
The Math.tanh() function returns the hyperbolic tangent of a number, that is
353 Math.trunc() ECMAScript6, JavaScript, Math, Method, Reference
The Math.trunc() function returns the integral part of a number by removing any fractional digits.
354 NaN JavaScript
The global NaN property is a value representing Not-A-Number.
355 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.
356 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.
357 Number.MAX_SAFE_INTEGER ECMAScript6, JavaScript, Number, Property
The Number.MAX_SAFE_INTEGER constant represents the maximum safe integer in JavaScript (253 - 1).
358 Number.MAX_VALUE JavaScript, Number, Property
The Number.MAX_VALUE property represents the maximum numeric value representable in JavaScript.
359 Number.MIN_SAFE_INTEGER ECMAScript6, JavaScript, Number, Property
The Number.MIN_SAFE_INTEGER constant represents the minimum safe integer in JavaScript (-(253 - 1)).
360 Number.MIN_VALUE JavaScript, Number, Property
The Number.MIN_VALUE property represents the smallest positive numeric value representable in JavaScript.
361 Number.NEGATIVE_INFINITY JavaScript, Number, Property
The Number.NEGATIVE_INFINITY property represents the negative Infinity value.
362 Number.NaN JavaScript, Number, Property
The Number.NaN property represents Not-A-Number. Equivalent of NaN.
363 Number.POSITIVE_INFINITY JavaScript, Number, Property
The Number.POSITIVE_INFINITY property represents the positive Infinity value.
364 Number.isFinite() JavaScript, Method, Number, Reference
The Number.isFinite() method determines whether the passed value is a finite number.
365 Number.isInteger() JavaScript, Method, Number, Reference
The Number.isInteger() method determines whether the passed value is an integer.
366 Number.isNaN() ECMAScript6, JavaScript, Method, Number
The Number.isNaN() method determines whether the passed value is NaN. More robust version of the original global isNaN().
367 Number.isSafeInteger() ECMAScript6, JavaScript, Method, Number
The Number.isSafeInteger() method determines whether the provided value is a number that is a safe integer. A safe integer is an integer that
368 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).
369 Number.parseInt() ECMAScript6, JavaScript, Method, Number
The Number.parseInt() method parses a string argument and returns an integer of the specified radix or base.
370 Number.prototype JavaScript, Number, Property, Prototype, prototype
The Number.prototype property represents the prototype for the Number constructor.
371 Number.prototype.toExponential() JavaScript, Method, Number, Prototype, prototype
The toExponential() method returns a string representing the Number object in exponential notation.
372 Number.prototype.toFixed() JavaScript, Method, Number, Prototype, prototype
The toFixed() method formats a number using fixed-point notation.
373 Number.prototype.toLocaleString() Internationalization, JavaScript, Method, Number, Prototype, prototype
The toLocaleString() method returns a string with a language sensitive representation of this number.
374 Number.prototype.toPrecision() JavaScript, Method, Number, Prototype, prototype
The toPrecision() method returns a string representing the Number object to the specified precision.
375 Number.prototype.toSource() JavaScript, Method, Number, Prototype
The toSource() method returns a string representing the source code of the object.
376 Number.prototype.toString() JavaScript, Method, Number, Prototype, prototype
The toString() method returns a string representing the specified Number object.
377 Number.prototype.valueOf() JavaScript, Method, Number, Prototype, prototype
The valueOf() method returns the wrapped primitive value of a Number object.
378 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.
379 Object Constructor, JavaScript, Object
The Object constructor creates an object wrapper.
380 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.
381 Object.create() ECMAScript5, JavaScript, Method, Object, Reference, polyfill
The Object.create() method creates a new object with the specified prototype object and properties.
382 Object.defineProperties() ECMAScript5, JavaScript, Method, Object
The Object.defineProperties() method defines new or modifies existing properties directly on an object, returning the object.
383 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.
384 Additional examples for Object.defineProperty Examples, JavaScript, Object
This page provides additional examples for Object.defineProperty().
385 Object.entries() Experimental, JavaScript, Method, Object
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).
386 Object.freeze() ECMAScript5, JavaScript, Method, Object
Technical review completed.
387 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.
388 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, not present by dint of being along an object's prototype chain) of a given object.
389 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.
390 Object.getOwnPropertySymbols() ECMAScript6, JavaScript, Method, Object
The Object.getOwnPropertySymbols() method returns an array of all symbol properties found directly upon a given object.
391 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.
392 Object.is() Comparison, Condition, Conditional, ECMAScript6, Equality, JavaScript, Method, Object
The Object.is() method determines whether two values are the same value.
393 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).
394 Object.isFrozen() ECMAScript5, JavaScript, JavaScript 1.8.5, Method, Object
The Object.isFrozen() determines if an object is frozen.
395 Object.isSealed() ECMAScript5, JavaScript, JavaScript 1.8.5, Method, Object
The Object.isSealed() method determines if an object is sealed.
396 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).
397 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.
398 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).
399 Object.prototype JavaScript, Object, Property
The Object.prototype property represents the Object prototype object.
400 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.
401 Object.prototype.__defineGetter__() Deprecated, JavaScript, Javascript, Method, Object, Prototype, javascript, prototype
The __defineGetter__ method binds an object's property to a function to be called when that property is looked up.
402 Object.prototype.__defineSetter__() 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.
403 Object.prototype.__lookupGetter__() Deprecated, JavaScript, Method, Object, Prototype
The __lookupGetter__ method returns the function bound as a getter to the specified property.
404 Object.prototype.__lookupSetter__() Deprecated, JavaScript, Method, Object, Prototype
The __lookupSetter__ method returns the function bound as a setter to the specified property.
405 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.
406 Object.prototype.__parent__ JavaScript, Object, Obsolete, Property, Prototype
The __parent__ property used to point to an object's context, but it has been removed.
407 Object.prototype.__proto__ Deprecated, JavaScript, Object, Property, Prototype, Reference, prototype
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.
408 Object.prototype.constructor JavaScript, Object, Property, Prototype, 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".
409 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.
410 Object.prototype.hasOwnProperty() JavaScript, Method, Object, Prototype, prototype
The hasOwnProperty() method returns a boolean indicating whether the object has the specified property.
411 Object.prototype.isPrototypeOf() JavaScript, Method, Object, Prototype, prototype
The isPrototypeOf() method tests for an object in another object's prototype chain.
412 Object.prototype.propertyIsEnumerable() JavaScript, Method, Object, Prototype, prototype
The propertyIsEnumerable() method returns a Boolean indicating whether the specified property is enumerable.
413 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.
414 Object.prototype.toSource() JavaScript, Method, Object, Prototype
The toSource() method returns a string representing the source code of the object.
415 Object.prototype.toString() JavaScript, Method, Object, Prototype, prototype
The toString() method returns a string representing object.
416 Object.prototype.unwatch() JavaScript, Method, Object, Prototype, Reference
The unwatch() method removes a watchpoint set with the watch() method.
417 Object.prototype.valueOf() JavaScript, Method, Object, Prototype, prototype
Technical review completed.
418 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.
419 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.
420 Object.setPrototypeOf() ECMAScript6, JavaScript, Method, Object
The Object.setPrototypeOf() method sets the prototype (i.e., the internal [[Prototype]] property) of a specified object to another object or null.
421 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.
422 Object.values() Experimental, JavaScript, Method, Object
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).
423 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.
424 Promise ECMAScript6, JavaScript, Promise
The Promise object is used for deferred and asynchronous computations. A Promise represents an operation that hasn't completed yet, but is expected in the future.
425 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.
426 Promise.prototype JavaScript, Promise, Property
The Promise.prototype property represents the prototype for the Promise constructor.
427 Promise.prototype.catch() ECMAScript6, JavaScript, Method, Promise, Prototype, prototype
The catch() method returns a Promise and deals with rejected cases only. It behaves the same as calling Promise.prototype.then(undefined, onRejected).
428 Promise.prototype.then() ECMAScript6, JavaScript, Javascript, Method, Promise, Prototype, javascript, prototype
The then() method returns a Promise. It takes two arguments: callback functions for the success and failure cases of the Promise.
429 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.
430 Promise.reject() ECMAScript6, JavaScript, Method, Promise
The Promise.reject(reason) method returns a Promise object that is rejected with the given reason.
431 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.
432 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).
433 Proxy handler ECMAScript6, JavaScript, Proxy
The proxy's handler object is a placeholder object which contains traps for proxies.
434 handler.apply() ECMAScript6, JavaScript, Method, Proxy
The handler.apply() method is a trap for a function call.
435 handler.construct() ECMAScript6, JavaScript, Method, Proxy
The handler.construct() method is a trap for the new operator.
436 handler.defineProperty() ECMAScript6, JavaScript, Method, Proxy
The handler.defineProperty() method is a trap for Object.defineProperty().
437 handler.deleteProperty() ECMAScript6, JavaScript, Method, Proxy
The handler.deleteProperty() method is a trap for the delete operator.
438 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.
439 handler.get() ECMAScript6, JavaScript, Method, Proxy
The handler.get() method is a trap for getting a property value.
440 handler.getOwnPropertyDescriptor() ECMAScript6, JavaScript, Method, Proxy
The handler.getOwnPropertyDescriptor() method is a trap for Object.getOwnPropertyDescriptor().
441 handler.getPrototypeOf() ECMAScript6, JavaScript, Method, Proxy
The handler.getPrototypeOf() method is a trap for the [[GetPrototypeOf]] internal method.
442 handler.has() ECMAScript6, JavaScript, Method, Proxy
The handler.has() method is a trap for the in operator.
443 handler.isExtensible() ECMAScript6, JavaScript, Method, Proxy
The handler.isExtensible() method is a trap for Object.isExtensible().
444 handler.ownKeys() ECMAScript6, JavaScript, Method, Proxy
The handler.ownKeys() method is a trap for Object.getOwnPropertyNames().
445 handler.preventExtensions() ECMAScript6, JavaScript, Method, Proxy
The handler.preventExtensions() method is a trap for Object.preventExtensions().
446 handler.set() ECMAScript6, JavaScript, Method, Proxy
The handler.set() method is a trap for setting a property value.
447 handler.setPrototypeOf() ECMAScript6, JavaScript, Method, NeedsExample, Prototype, Proxy, prototype
The handler.setPrototypeOf() method is a trap for Object.setPrototypeOf().
448 Proxy.revocable() ECMAScript6, JavaScript, Method, Proxy
The Proxy.revocable() method is used to create a revocable Proxy object.
449 RangeError Error, JavaScript, Object, RangeError
The RangeError object indicates an error when a value is not in the set or range of allowed values.
450 RangeError.prototype Error, JavaScript, Property, Prototype, RangeError, prototype
The RangeError.prototype property represents the prototype the RangeError constructor.
451 ReferenceError Error, JavaScript, Object, Reference, ReferenceError
The ReferenceError object represents an error when a non-existent variable is referenced.
452 ReferenceError.prototype Error, JavaScript, Property, Prototype, ReferenceError, prototype
The ReferenceError.prototype property represents the prototype for the ReferenceError constructor.
453 Reflect ECMAScript6, JavaScript, Javascript, Overview, Reflect, javascript
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.
454 Reflect.apply() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.apply() method calls a target function with arguments as specified.
455 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).
456 Reflect.defineProperty() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.defineProperty() method is like Object.defineProperty() but returns a Boolean.
457 Reflect.deleteProperty() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.deleteProperty() method allows to delete properties. It is like the delete operator as a function.
458 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.
459 Reflect.get() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.get() method works like getting a property from an object (target[propertyKey]) as a function.
460 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.
461 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.
462 Reflect.has() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.has() method works like the in operator as a function.
463 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.
464 Reflect.ownKeys() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.ownKeys() method returns an array of the target object's own property keys.
465 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.
466 Reflect.set() ECMAScript6, JavaScript, Method, Reflect
The static Reflect.set() method works like setting a property on an object.
467 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.
468 RegExp Constructor, JavaScript, Reference, RegExp, Regular Expressions
The RegExp constructor creates a regular expression object for matching text with a pattern.
469 RegExp.$1-$9 JavaScript, Property, Read-only, Reference, RegExp, Regular Expressions
The non-standard $1, $2, $3, $4, $5, $6, $7, $8, $9 properties are static and read-only properties of regular expressions that contain parenthesized substring matches.
470 RegExp.input ($_) 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.$_ is an alias for this property.
471 RegExp.lastIndex JavaScript, Property, Reference, RegExp, Regular Expressions
The lastIndex is a read/write integer property of regular expressions that specifies the index at which to start the next match.
472 RegExp.lastMatch ($&) 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.$& is an alias for this property.
473 RegExp.lastParen ($+) 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.$+ is an alias for this property.
474 RegExp.leftContext ($`) 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.
475 RegExp.prototype JavaScript, Property, Prototype, Reference, RegExp, prototype
The RegExp.prototype property represents the prototype object for the RegExp constructor.
476 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.
477 RegExp.prototype.exec() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions, prototype
The exec() method executes a search for a match in a specified string. Returns a result array, or null.
478 RegExp.prototype.flags ECMAScript6, JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions, prototype
The flags property returns a string consisting of the flags of the current regular expression object.
479 RegExp.prototype.global JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions, prototype
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.
480 RegExp.prototype.ignoreCase JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions, prototype
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.
481 RegExp.prototype.multiline JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions, prototype
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.
482 RegExp.prototype.source JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions, prototype
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.
483 RegExp.prototype.sticky ECMAScript6, JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions, prototype
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.
484 RegExp.prototype.test() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions, prototype
The test() method executes a search for a match between a regular expression and a specified string. Returns true or false.
485 RegExp.prototype.toSource() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions
The toSource() method returns a string representing the source code of the object.
486 RegExp.prototype.toString() JavaScript, Method, Prototype, Reference, RegExp, Regular Expressions, prototype
The toString() method returns a string representing the regular expression.
487 RegExp.prototype.unicode ECMAScript6, JavaScript, Property, Prototype, Reference, RegExp, Regular Expressions, prototype
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.
488 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.
489 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.
490 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.
491 SIMD.%type%.add() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.add() method returns a new instance with the lane values added (a + b).
492 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.
493 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.
494 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.
495 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.
496 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.
497 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.
498 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.
499 SIMD.%type%.extractLane() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.extractLane() method returns the value of a given lane.
500 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.
501 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.
502 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.
503 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.
504 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.
505 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.
506 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.
507 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.
508 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.
509 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.
510 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.
511 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.
512 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.
513 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.
514 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.
515 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.
516 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)).
517 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.
518 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)).
519 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.
520 SIMD.%type%.mul() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.mul() method returns a new instance with the lane values multiplied (a * b).
521 SIMD.%type%.neg() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.mul() method returns a new instance with the lane values negated.
522 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.
523 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.
524 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.
525 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.
526 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).
527 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.
528 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.
529 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.
530 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).
531 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:
532 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.
533 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.
534 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).
535 SIMD.%type%.store() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.store() methods store a SIMD data type into a typed array.
536 SIMD.%type%.sub() Experimental, JavaScript, Method, SIMD
The static SIMD.%type%.sub() method returns a new instance with the lane values subtracted (a - b).
537 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.
538 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).
539 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).
540 SIMD.Bool16x8 Experimental, JavaScript, SIMD
The SIMD.Bool16x8 data type is a 128-bit vector divided into 8 lanes storing boolean values.
541 SIMD.Bool32x4 Experimental, JavaScript, SIMD
The SIMD.Bool32x4 data type is a 128-bit vector divided into 4 lanes storing boolean values.
542 SIMD.Bool64x2 Experimental, JavaScript, SIMD
The SIMD.Bool64x2 data type is a 128-bit vector divided into 2 lanes storing boolean values.
543 SIMD.Bool8x16 Experimental, JavaScript, SIMD
The SIMD.Bool8x16 data type is a 128-bit vector divided into 16 lanes storing boolean values.
544 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.
545 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.
546 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.
547 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.
548 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.
549 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.
550 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.
551 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.
552 Set ECMAScript6, JavaScript, set
The Set object lets you store unique values of any type, whether primitive values or object references.
553 Set.prototype ECMAScript6, JavaScript, Property, set
The Set.prototype property represents the prototype for the Set constructor.
554 Set.prototype.add() ECMAScript6, JavaScript, Method, Prototype, prototype, set
The add() method appends a new element with a specified value to the end of a Set object.
555 Set.prototype.clear() ECMAScript6, JavaScript, Method, Prototype, prototype, set
The clear() method removes all elements from a Set object.
556 Set.prototype.delete() ECMAScript6, JavaScript, Method, Prototype, prototype, set
The delete() method removes the specified element from a Set object.
557 Set.prototype.entries() ECMAScript6, Iterator, JavaScript, Method, Prototype, 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.
558 Set.prototype.forEach() ECMAScript6, JavaScript, Method, Prototype, prototype, set
The forEach() method executes a provided function once per each value in the Set object, in insertion order.
559 Set.prototype.has() ECMAScript6, JavaScript, Method, Prototype, prototype, set
The has() method returns a boolean indicating whether an element with the specified value exists in a Set object or not.
560 Set.prototype.size ECMAScript6, JavaScript, Property, Prototype, prototype, set
The size accessor property returns the number of elements in a Set object.
561 Set.prototype.values() ECMAScript6, Iterator, JavaScript, Javascript, Method, Prototype, javascript, prototype, set
The values() method returns a new Iterator object that contains the values for each element in the Set object in insertion order.
562 Set.prototype[@@iterator]() ECMAScript6, Iterator, JavaScript, Method, Prototype, Reference, prototype, set
The initial value of the @@iterator property is the same function object as the initial value of the values property.
563 get Set[@@species] ECMAScript6, JavaScript, Property, set
The Set[@@species] accessor property returns the Set constructor.
564 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.
565 SharedArrayBuffer.prototype Experimental, JavaScript, Property, Shared Memory, SharedArrayBuffer, TypedArrays
The SharedArrayBuffer.prototype property represents the prototype for the SharedArrayBuffer object.
566 SharedArrayBuffer.prototype.byteLength Experimental, JavaScript, Property, Shared Memory, SharedArrayBuffer, TypedArrays
The byteLength accessor property represents the length of an SharedArrayBuffer in bytes.
567 StopIteration Deprecated, JavaScript, Legacy Iterator, Reference, StopIteration
The StopIteration object is used to tell the end of the iteration in the legacy iterator protocol.
568 String ECMAScript6, JavaScript, Reference, String
The String global object is a constructor for strings, or a sequence of characters.
569 String.fromCharCode() JavaScript, Method, Reference, String, Unicode
The static String.fromCharCode() method returns a string created by using the specified sequence of Unicode values.
570 String.fromCodePoint() ECMAScript6, JavaScript, Method, Reference, String
The static String.fromCodePoint() method returns a string created by using the specified sequence of code points.
571 String.length JavaScript, Property, Prototype, Reference, String, prototype
The length property represents the length of a string.
572 String.prototype JavaScript, Property, Prototype, Reference, String, prototype
The String.prototype property represents the String prototype object.
573 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.
574 String.prototype.big() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String, prototype
The big() method creates a <big> HTML element that causes a string to be displayed in a big font.
575 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.
576 String.prototype.bold() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String, prototype
The bold() method creates a <b> HTML element that causes a string to be displayed as bold.
577 String.prototype.charAt() JavaScript, Method, Prototype, Reference, String, prototype
The charAt() method returns the specified character from a string.
578 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().
579 String.prototype.codePointAt() ECMAScript6, JavaScript, Method, Prototype, Reference, String, prototype
The codePointAt() method returns a non-negative integer that is the Unicode code point value.
580 String.prototype.concat() JavaScript, Method, Prototype, Reference, String, prototype
The concat() method combines the text of two or more strings and returns a new string.
581 String.prototype.endsWith() JavaScript, Method, Prototype, Reference, String, prototype
The endsWith() method determines whether a string ends with the characters of another string, returning true or false as appropriate.
582 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.
583 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.
584 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.
585 String.prototype.includes() JavaScript, Method, Prototype, Reference, String, prototype
The includes() method determines whether one string may be found within another string, returning true or false as appropriate.
586 String.prototype.indexOf() JavaScript, Method, Prototype, Reference, String, prototype
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.
587 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.
588 String.prototype.lastIndexOf() JavaScript, Method, Prototype, Reference, String, prototype
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.
589 String.prototype.link() HTML wrapper methods, JavaScript, Method, Prototype, Reference, String, prototype
The link() method creates an <a> HTML element that causes a string to be displayed as a hypertext link to another URL.
590 String.prototype.localeCompare() Internationalization, JavaScript, Method, Prototype, Reference, String, prototype
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.
591 String.prototype.match() JavaScript, Method, Prototype, Reference, Regular Expressions, String, prototype
The match() method retrieves the matches when matching a string against a regular expression.
592 String.prototype.normalize() ECMAScript6, JavaScript, Method, Prototype, Reference, String, Unicode, prototype
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).
593 String.prototype.quote() JavaScript, Method, Obsolete, Prototype, Reference, String
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 (").
594 String.prototype.repeat() ECMAScript6, JavaScript, Method, Prototype, Reference, String, prototype
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.
595 String.prototype.replace() Expressions, JavaScript, Method, Prototype, Reference, Regular, String, prototype
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.
596 String.prototype.search() JavaScript, Method, Prototype, Reference, Regular Expressions, String, prototype
The search() method executes a search for a match between a regular expression and this String object.
597 String.prototype.slice() JavaScript, Method, Prototype, Reference, String, prototype
The slice() method extracts a section of a string and returns a new string.
598 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.
599 String.prototype.split() JavaScript, Method, Prototype, Reference, Regular Expressions, String, prototype
Technical review completed.
600 String.prototype.startsWith() ECMAScript6, JavaScript, Method, Prototype, Reference, String, prototype
The startsWith() method determines whether a string begins with the characters of another string, returning true or false as appropriate.
601 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.
602 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.
603 String.prototype.substr() JavaScript, Method, Prototype, Reference, String, prototype
The substr() method returns the characters in a string beginning at the specified location through the specified number of characters.
604 String.prototype.substring() JavaScript, Method, Prototype, Reference, String, prototype
The substring() method returns a subset of a string between one index and another, or through the end of the string.
605 String.prototype.sup() Deprecated, HTML wrapper methods, JavaScript, Method, Prototype, Reference, String, prototype
The sup() method creates a <sup> HTML element that causes a string to be displayed as superscript.
606 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.
607 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.
608 String.prototype.toLowerCase() JavaScript, Method, Prototype, Reference, String, prototype
The toLowerCase() method returns the calling string value converted to lowercase.
609 String.prototype.toSource() JavaScript, Method, Non-standard, Prototype, Reference, String, prototype
The toSource() method returns a string representing the source code of the object.
610 String.prototype.toString() JavaScript, Method, Prototype, Reference, String, prototype
The toString() method returns a string representing the specified object.
611 String.prototype.toUpperCase() JavaScript, Method, Prototype, Reference, String, prototype
The toUpperCase() method returns the calling string value converted to uppercase.
612 String.prototype.trim() ECMAScript5, JavaScript, Method, Prototype, Reference, String, prototype
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.).
613 String.prototype.trimLeft() JavaScript, Method, Prototype, Reference, String
The trimLeft() method removes whitespace from the left end of a string.
614 String.prototype.trimRight() JavaScript, Method, Prototype, Reference, String
The trimRight() method removes whitespace from the right end of a string.
615 String.prototype.valueOf() JavaScript, Method, Prototype, Reference, String, prototype
The valueOf() method returns the primitive value of a String object.
616 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.
617 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. It's used to get the raw string form of template strings (that is, the original, uninterpreted text).
618 Symbol ECMAScript6, JavaScript, Symbol
A symbol is a unique and immutable data type and may be used as an identifier for object properties. The symbol object is an implicit object wrapper for the symbol primitive data type.
619 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.
620 Symbol.iterator ECMAScript6, JavaScript, Property, Symbol
The Symbol.iterator well-known symbol specifies the default iterator for an object. Used by for...of.
621 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.
622 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.
623 Symbol.prototype JavaScript, Property, Symbol
The Symbol.prototype property represents the prototype for the Symbol constructor.
624 Symbol.prototype.toSource() JavaScript, Method, Prototype, Symbol
The toSource() method returns a string representing the source code of the object.
625 Symbol.prototype.toString() ECMAScript6, JavaScript, Method, Prototype, Symbol, prototype
The toString() method returns a string representing the specified Symbol object.
626 Symbol.prototype.valueOf() ECMAScript6, JavaScript, Method, Prototype, Symbol, prototype
The valueOf() method returns the primitive value of a Symbol object.
627 Symbol.prototype[@@toPrimitive] ECMAScript6, JavaScript, Method, Prototype, Symbol, prototype
The [@@toPrimitive]() method converts a Symbol object to a primitive value.
628 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.
629 Symbol.toPrimitive ECMAScript6, JavaScript, Property, Symbol
The Symbol.toPrimitive well-known symbol specifies a function valued property that is called to convert an object to a corresponding primitive value.
630 SyntaxError Error, JavaScript, Object, Reference, SyntaxError
The SyntaxError object represents an error when trying to interpret syntactically invalid code.
631 SyntaxError.prototype Error, JavaScript, Property, Prototype, SyntaxError, prototype
The SyntaxError.prototype property represents the prototype for the SyntaxError constructor.
632 TypeError Error, JavaScript, Object, Reference, TypeError
The TypeError object represents an error when a value is not of the expected type.
633 TypeError.prototype Error, JavaScript, Property, Prototype, TypeError, prototype
The TypeError.prototype property represents the prototype for the TypeError constructor.
634 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.
635 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.
636 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().
637 TypedArray.name JavaScript, Property, TypedArray, TypedArrays
The TypedArray.name property represents a string value of the typed array constructor name.
638 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().
639 TypedArray.prototype JavaScript, Property, TypedArray, TypedArrays
The TypedArray.prototype property represents the prototype for TypedArray constructors.
640 TypedArray.prototype.buffer JavaScript, Property, Prototype, TypedArray, TypedArrays, prototype
The buffer accessor property represents the ArrayBuffer referenced by a TypedArray at construction time.
641 TypedArray.prototype.byteLength JavaScript, Property, Prototype, TypedArray, TypedArrays, prototype
The byteLength accessor property represents the length (in bytes) of a typed array from the start of its ArrayBuffer.
642 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.
643 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.
644 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.
645 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.
646 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.
647 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.
648 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.
649 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.
650 TypedArray.prototype.forEach() ECMAScript6, JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays, prototype
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.
651 TypedArray.prototype.includes() ECMAScript7, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
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.
652 TypedArray.prototype.indexOf() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
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.
653 TypedArray.prototype.join() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
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.
654 TypedArray.prototype.keys() ECMAScript6, Iterator, JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays, prototype
The keys() method returns a new Array Iterator object that contains the keys for each index in the array.
655 TypedArray.prototype.lastIndexOf() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
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.
656 TypedArray.prototype.length JavaScript, Property, Prototype, TypedArray, TypedArrays, prototype
The length accessor property represents the length (in elements) of a typed array.
657 TypedArray.prototype.map() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
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.
658 TypedArray.prototype.move() JavaScript, Method, Obsolete, Prototype, TypedArray
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.
659 TypedArray.prototype.reduce() JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays, prototype
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.
660 TypedArray.prototype.reduceRight() JavaScript, Method, Prototype, Reference, TypedArray, TypedArrays, prototype
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.
661 TypedArray.prototype.reverse() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
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.
662 TypedArray.prototype.set() JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
The set() method stores multiple values in the typed array, reading input values from a specified array.
663 TypedArray.prototype.slice() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
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.
664 TypedArray.prototype.some() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
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.
665 TypedArray.prototype.sort() ECMAScript6, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
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.
666 TypedArray.prototype.subarray() JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
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.
667 TypedArray.prototype.values() ECMAScript6, Iterator, JavaScript, Method, Prototype, TypedArray, TypedArrays, prototype
The values() method returns a new Array Iterator object that contains the values for each index in the array.
668 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.
669 URIError Error, JavaScript, Object, Reference, URIError
The URIError object represents an error when a global URI handling function was used in a wrong way.
670 URIError.prototype Error, JavaScript, Property, Prototype, URIError, prototype
The URIError.prototype property represents the prototype for the URIError constructor.
671 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).
672 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).
673 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).
674 Uint8ClampedArray Constructor, JavaScript, TypedArray, TypedArrays, Uint8ClampedArray
The Uint8ClampedArray typed array represents an array of 8-bit unsigned integers clamped to 0-255. 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).
675 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.
676 WeakMap.prototype ECMAScript6, JavaScript, Property, WeakMap
The WeakMap.prototype property represents the prototype for the WeakMap constructor.
677 WeakMap.prototype.clear() JavaScript, Method, Obsolete, Prototype, WeakMap, prototype
The clear() method used to remove all elements from a WeakMap object, but is no longer part of ECMAScript and its implementations.
678 WeakMap.prototype.delete() ECMAScript6, JavaScript, Method, Prototype, WeakMap, prototype
The delete() method removes the specified element from a WeakMap object.
679 WeakMap.prototype.get() ECMAScript6, JavaScript, Method, Prototype, WeakMap, prototype
The get() method returns a specified element from a WeakMap object.
680 WeakMap.prototype.has() ECMAScript6, JavaScript, Method, Prototype, WeakMap, prototype
The has() method returns a boolean indicating whether an element with the specified key exists in the WeakMap object or not.
681 WeakMap.prototype.set() ECMAScript6, JavaScript, Method, Prototype, WeakMap, prototype
The set() method adds a new element with a specified key and value to a WeakMap object.
682 WeakSet ECMAScript6, JavaScript, WeakSet
The WeakSet object lets you store weakly held objects in a collection.
683 WeakSet.prototype ECMAScript6, JavaScript, Property, WeakSet
The WeakSet.prototype property represents the prototype for the WeakSet constructor.
684 WeakSet.prototype.add() ECMAScript6, JavaScript, Method, Prototype, WeakSet, prototype
The add() method appends a new object to the end of a WeakSet object.
685 WeakSet.prototype.clear() JavaScript, Method, Obsolete, Prototype, WeakSet, prototype
The clear() method used to remove all elements from a WeakSet object, but is no longer part of ECMAScript and its implementations.
686 WeakSet.prototype.delete() ECMAScript6, JavaScript, Method, Prototype, WeakSet, prototype
The delete() method removes the specified element from a WeakSet object.
687 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.
688 decodeURI() JavaScript
The decodeURI() function decodes a Uniform Resource Identifier (URI) previously created by encodeURI or by a similar routine.
689 decodeURIComponent() JavaScript
The decodeURIComponent() function decodes a Uniform Resource Identifier (URI) component previously created by encodeURIComponent or by a similar routine.
690 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).
691 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).
692 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.
693 eval() JavaScript
The eval() function evaluates JavaScript code represented as a string.
694 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.
695 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.
696 null JavaScript, Literal, Primitive
The value null is a JavaScript literal representing null or an "empty" value, i.e. no object value is present. It is one of JavaScript's primitive values.
697 parseFloat() JavaScript
The parseFloat() function parses a string argument and returns a floating point number.
698 parseInt() JavaScript
The parseInt() function parses a string argument and returns an integer of the specified radix (the base in mathematical numeral systems).
699 undefined JavaScript
The global undefined property represents the primitive value undefined. It is one of JavaScript's primitive types.
700 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.
701 uneval() JavaScript
The uneval() function creates a string representation of the source code of an Object.
702 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.
703 Legacy generator function JavaScript, Legacy Iterator, Reference, Référence
The legacy generator function statement declares legacy generator functions with the specified parameters.
704 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.
705 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.
706 class Classes, Declaration, ECMAScript6, JavaScript, Ref, Statement
The class declaration creates a new class with a given name using prototype-based inheritance.
707 const ECMAScript6, JavaScript, Reference, Statement, constants
The const declaration creates a read-only reference to a value. It does not mean the value it holds is immutable, just that the variable identifier cannot be reassigned.
708 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.
709 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.
710 default JavaScript, Keyword
The default keyword can be used in two situations in JavaScript: within a switch statement, or with an export statement.
711 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.
712 empty JavaScript, Statement
An empty statement is used to provide no statement, although the JavaScript syntax would expect one.
713 export ECMAScript6, JavaScript, Statement
The export statement is used to export functions, objects or primitives from a given file (or module).
714 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 or a set of statements executed in the loop.
715 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.
716 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.
717 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.
718 function JavaScript, Statement
The function declaration defines a function with the specified parameters.
719 function* ECMAScript6, Function, Iterator, JavaScript, Statement
The function* declaration (function keyword followed by an asterisk) defines a generator function, which returns a Generator object.
720 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.
721 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.
722 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.
723 let ECMAScript 2015, ECMAScript6, JavaScript, Statement
The let statement declares a block scope local variable, optionally initializing it to a value.
724 return JavaScript, Statement
The return statement ends function execution and specifies a value to be returned to the function caller.
725 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.
726 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.
727 try...catch JavaScript, Statement
The try...catch statement marks a block of statements to try, and specifies a response, should an exception be thrown.
728 var JavaScript, Statement
The variable statement declares a variable, optionally initializing it to a value.
729 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.
730 with Deprecated, JavaScript, Statement
The with statement extends the scope chain for a statement.
731 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.
732 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.
733 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.
734 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.
735 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.
736 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.
737 Memory Management JavaScript, memory
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" free'd 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.
738 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.
739 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.
740 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.
741 ECMAScript Next support in Mozilla Firefox, JavaScript, Javascript, 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.
742 Firefox JavaScript changelog JavaScript, Versions
The following is a changelog for JavaScript features in Firefox releases.
743 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.
744 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.
745 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.
746 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.
747 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).
748 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.
749 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).
750 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.
751 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.
752 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.
753 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.
754 The performance hazards of [[Prototype]] mutation JavaScript, Performance, performance
Every JavaScript object has a [[Prototype]].  Getting a property on an object first searches that object, then its [[Prototype]], then that object's [[Prototype]], until the property is found or the chain ends.  The [[Prototype]] chain is especially useful for object inheritance.

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