The JavaScript Array
class is a global object that is used in the construction of arrays; which are high-level, list-like objects.
Description
Arrays are list-like objects whose prototype has methods to perform traversal and mutation operations. Neither the length of a JavaScript array nor the types of its elements are fixed. Since an array's length can change at any time, and data can be stored at non-contiguous locations in the array, JavaScript arrays are not guaranteed to be dense; this depends on how the programmer chooses to use them. In general, these are convenient characteristics; but if these features are not desirable for your particular use, you might consider using typed arrays.
Arrays cannot use strings as element indexes (as in an associative array) but must use integers. Setting or accessing via non-integers using bracket notation (or dot notation) will not set or retrieve an element from the array list itself, but will set or access a variable associated with that array's object property collection. The array's object properties and list of array elements are separate, and the array's traversal and mutation operations cannot be applied to these named properties.
Common operations
Create an Array
var fruits = ['Apple', 'Banana']; console.log(fruits.length); // 2
Access (index into) an Array item
var first = fruits[0]; // Apple var last = fruits[fruits.length - 1]; // Banana
Loop over an Array
fruits.forEach(function(item, index, array) { console.log(item, index); }); // Apple 0 // Banana 1
Add to the end of an Array
var newLength = fruits.push('Orange'); // ["Apple", "Banana", "Orange"]
Remove from the end of an Array
var last = fruits.pop(); // remove Orange (from the end) // ["Apple", "Banana"];
Remove from the front of an Array
var first = fruits.shift(); // remove Apple from the front // ["Banana"];
Add to the front of an Array
var newLength = fruits.unshift('Strawberry') // add to the front // ["Strawberry", "Banana"];
Find the index of an item in the Array
fruits.push('Mango'); // ["Strawberry", "Banana", "Mango"] var pos = fruits.indexOf('Banana'); // 1
Remove an item by index position
var removedItem = fruits.splice(pos, 1); // this is how to remove an item // ["Strawberry", "Mango"]
Remove items from an index position
var vegetables = ['Cabbage', 'Turnip', 'Radish', 'Carrot']; console.log(vegetables); // ["Cabbage", "Turnip", "Radish", "Carrot"] var pos = 1, n = 2; var removedItems = vegetables.splice(pos, n); // this is how to remove items, n defines the number of items to be removed, // from that position(pos) onward to the end of array. console.log(vegetables); // ["Cabbage", "Carrot"] (the original array is changed) console.log(removedItems); // ["Turnip", "Radish"]
Copy an Array
var shallowCopy = fruits.slice(); // this is how to make a copy // ["Strawberry", "Mango"]
Accessing array elements
JavaScript arrays are zero-indexed: the first element of an array is at index 0
, and the last element is at the index equal to the value of the array's length
property minus 1. Using an invalid index number returns undefined
.
var arr = ['this is the first element', 'this is the second element', 'this is the last element']; console.log(arr[0]); // logs 'this is the first element' console.log(arr[1]); // logs 'this is the second element' console.log(arr[arr.length - 1]); // logs 'this is the last element'
Array elements are object properties in the same way that toString
is a property, but trying to access an element of an array as follows throws a syntax error because the property name is not valid:
console.log(arr.0); // a syntax error
There is nothing special about JavaScript arrays and the properties that cause this. JavaScript properties that begin with a digit cannot be referenced with dot notation; and must be accessed using bracket notation. For example, if you had an object with a property named '3d'
, it can only be referenced using bracket notation. E.g.:
var years = [1950, 1960, 1970, 1980, 1990, 2000, 2010]; console.log(years.0); // a syntax error console.log(years[0]); // works properly
renderer.3d.setTexture(model, 'character.png'); // a syntax error renderer['3d'].setTexture(model, 'character.png'); // works properly
Note that in the 3d
example, '3d'
had to be quoted. It's possible to quote the JavaScript array indexes as well (e.g., years['2']
instead of years[2]
), although it's not necessary. The 2 in years[2]
is coerced into a string by the JavaScript engine through an implicit toString
conversion. It is, for this reason, that '2'
and '02'
would refer to two different slots on the years
object and the following example could be true
:
console.log(years['2'] != years['02']);
Similarly, object properties which happen to be reserved words(!) can only be accessed as string literals in bracket notation (but it can be accessed by dot notation in firefox 40.0a2 at least):
var promise = { 'var' : 'text', 'array': [1, 2, 3, 4] }; console.log(promise['var']);
Relationship between length
and numerical properties
A JavaScript array's length
property and numerical properties are connected. Several of the built-in array methods (e.g., join()
, slice()
, indexOf()
, etc.) take into account the value of an array's length
property when they're called. Other methods (e.g., push()
, splice()
, etc.) also result in updates to an array's length
property.
var fruits = []; fruits.push('banana', 'apple', 'peach'); console.log(fruits.length); // 3
When setting a property on a JavaScript array when the property is a valid array index and that index is outside the current bounds of the array, the engine will update the array's length
property accordingly:
fruits[5] = 'mango'; console.log(fruits[5]); // 'mango' console.log(Object.keys(fruits)); // ['0', '1', '2', '5'] console.log(fruits.length); // 6
Increasing the length
.
fruits.length = 10; console.log(Object.keys(fruits)); // ['0', '1', '2', '5'] console.log(fruits.length); // 10
Decreasing the length
property does, however, delete elements.
fruits.length = 2; console.log(Object.keys(fruits)); // ['0', '1'] console.log(fruits.length); // 2
This is explained further on the Array.length
page.
Creating an array using the result of a match
The result of a match between a regular expression and a string can create a JavaScript array. This array has properties and elements which provide information about the match. Such an array is returned by RegExp.exec
, String.match
, and String.replace
. To help explain these properties and elements, look at the following example and then refer to the table below:
// Match one d followed by one or more b's followed by one d // Remember matched b's and the following d // Ignore case var myRe = /d(b+)(d)/i; var myArray = myRe.exec('cdbBdbsbz');
The properties and elements returned from this match are as follows:
Property/Element | Description | Example |
input |
A read-only property that reflects the original string against which the regular expression was matched. | cdbBdbsbz |
index |
A read-only property that is the zero-based index of the match in the string. | 1 |
[0] |
A read-only element that specifies the last matched characters. | dbBd |
[1], ...[n] |
Read-only elements that specify the parenthesized substring matches, if included in the regular expression. The number of possible parenthesized substrings is unlimited. | [1]: bB [2]: d |
Constructor
Static properties
Array.length
- The
Array
constructor's length property whose value is 1. get Array[@@species]
- The constructor function that is used to create derived objects.
Static methods
Array.from()
- Creates a new
Array
instance from an array-like or iterable object. Array.isArray()
- Returns true if a variable is an array, if not false.
Array.of()
- Creates a new
Array
instance with a variable number of arguments, regardless of number or type of the arguments.
Array
instances
Array
instances inherit from Array.prototype
. As with all constructors, you can change the constructor's prototype object to make changes to all Array
instances. For example, you can add new methods and properties to extend all Array
objects. This is used for polyfilling, for example.
However, adding non-standard methods to the array object can cause issues later, either with your own code, or when adding features to JavaScript.
Little known fact: Array.prototype
itself is an Array
:
Array.isArray(Array.prototype); // true
Instance properties
Array.prototype.constructor
- Specifies the function that creates an object's prototype.
Array.prototype.length
- Reflects the number of elements in an array.
Array.prototype[@@unscopables]
- A symbol containing property names to exclude from a
with
binding scope.
Instance methods
Mutator methods
These methods modify the array:
Array.prototype.copyWithin()
- Copies a sequence of array elements within the array.
Array.prototype.fill()
- Fills all the elements of an array from a start index to an end index with a static value.
Array.prototype.pop()
- Removes the last element from an array and returns that element.
Array.prototype.push()
- Adds one or more elements to the end of an array and returns the new length of the array.
Array.prototype.reverse()
- Reverses the order of the elements of an array in place — the first becomes the last, and the last becomes the first.
Array.prototype.shift()
- Removes the first element from an array and returns that element.
Array.prototype.sort()
- Sorts the elements of an array in place and returns the array.
Array.prototype.splice()
- Adds and/or removes elements from an array.
Array.prototype.unshift()
- Adds one or more elements to the front of an array and returns the new length of the array.
Accessor methods
These methods do not modify the array and return some representation of the array.
Array.prototype.concat()
- Returns a new array that is this array joined with other array(s) and/or value(s).
Array.prototype.includes()
- Determines whether an array contains a certain element, returning
true
orfalse
as appropriate. Array.prototype.indexOf()
- Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found.
Array.prototype.join()
- Joins all elements of an array into a string.
Array.prototype.lastIndexOf()
- Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found.
Array.prototype.slice()
- Extracts a section of an array and returns a new array.
Array.prototype.toSource()
- Returns an array literal representing the specified array; you can use this value to create a new array. Overrides the
Object.prototype.toSource()
method. Array.prototype.toString()
- Returns a string representing the array and its elements. Overrides the
Object.prototype.toString()
method. Array.prototype.toLocaleString()
- Returns a localized string representing the array and its elements. Overrides the
Object.prototype.toLocaleString()
method.
Iteration methods
Several methods take as arguments functions to be called back while processing the array. When these methods are called, the length
of the array is sampled, and any element added beyond this length from within the callback is not visited. Other changes to the array (setting the value of or deleting an element) may affect the results of the operation if the method visits the changed element afterwards. While the specific behavior of these methods in such cases is well-defined, you should not rely upon it so as not to confuse others who might read your code. If you must mutate the array, copy into a new array instead.
Array.prototype.entries()
- Returns a new
Array Iterator
object that contains the key/value pairs for each index in the array. Array.prototype.every()
- Returns true if every element in this array satisfies the provided testing function.
Array.prototype.filter()
- Creates a new array with all of the elements of this array for which the provided filtering function returns true.
Array.prototype.find()
- Returns the found value in the array, if an element in the array satisfies the provided testing function or
undefined
if not found. Array.prototype.findIndex()
- Returns the found index in the array, if an element in the array satisfies the provided testing function or -1 if not found.
Array.prototype.forEach()
- Calls a function for each element in the array.
Array.prototype.keys()
- Returns a new
Array Iterator
that contains the keys for each index in the array. Array.prototype.map()
- Creates a new array with the results of calling a provided function on every element in this array.
Array.prototype.reduce()
- Apply a function against an accumulator and each value of the array (from left-to-right) as to reduce it to a single value.
Array.prototype.reduceRight()
- Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value.
Array.prototype.some()
- Returns true if at least one element in this array satisfies the provided testing function.
Array.prototype.values()
- Returns a new
Array Iterator
object that contains the values for each index in the array. Array.prototype[@@iterator]()
- Returns a new
Array Iterator
object that contains the values for each index in the array.
Examples
Creating an array
The following example creates an array, msgArray
, with a length of 0, then assigns values to msgArray[0]
and msgArray[99]
, changing the length of the array to 100.
var msgArray = []; msgArray[0] = 'Hello'; msgArray[99] = 'world'; if (msgArray.length === 100) { console.log('The length is 100.'); }
Creating a two-dimensional array
The following creates a chess board as a two-dimensional array of strings. The first move is made by copying the 'p' in (6,4) to (4,4). The old position (6,4) is made blank.
var board = [ ['R','N','B','Q','K','B','N','R'], ['P','P','P','P','P','P','P','P'], [' ',' ',' ',' ',' ',' ',' ',' '], [' ',' ',' ',' ',' ',' ',' ',' '], [' ',' ',' ',' ',' ',' ',' ',' '], [' ',' ',' ',' ',' ',' ',' ',' '], ['p','p','p','p','p','p','p','p'], ['r','n','b','q','k','b','n','r'] ]; console.log(board.join('\n') + '\n\n'); // Move King's Pawn forward 2 board[4][4] = board[6][4]; board[6][4] = ' '; console.log(board.join('\n'));
Here is the output:
R,N,B,Q,K,B,N,R P,P,P,P,P,P,P,P , , , , , , , , , , , , , , , , , , , , , , , , , , , , p,p,p,p,p,p,p,p r,n,b,q,k,b,n,r R,N,B,Q,K,B,N,R P,P,P,P,P,P,P,P , , , , , , , , , , , , , , , , , ,p, , , , , , , , , , p,p,p,p, ,p,p,p r,n,b,q,k,b,n,r
Using an array to tabulate a set of values
values = []; for (var x = 0; x < 10; x++){ values.push([ 2 ** x, 2 * x ** 2 ]) }; console.table(values)
Results in
0 1 0 1 2 2 2 4 8 3 8 18 4 16 32 5 32 50 6 64 72 7 128 98 8 256 128 9 512 162
(First column is the (index))
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. |
ECMAScript 5.1 (ECMA-262) The definition of 'Array' in that specification. |
Standard | New methods added: Array.isArray , indexOf , lastIndexOf , every , some , forEach , map , filter , reduce , reduceRight |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Array' in that specification. |
Standard | New methods added: Array.from , Array.of , find , findIndex , fill , copyWithin |
ECMAScript 2016 (ECMA-262) The definition of 'Array' in that specification. |
Standard | New method added: Array.prototype.includes() |
ECMAScript Latest Draft (ECMA-262) The definition of 'Array' in that specification. |
Draft |
Browser compatibility
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Array | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 4 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
concat | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
copyWithin | Chrome Full support 45 | Edge Full support 12 | Firefox Full support 32 | IE No support No | Opera Full support 32 | Safari Full support 9 | WebView Android Full support Yes | Chrome Android Full support 45 | Firefox Android Full support 32 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes | nodejs Full support 4.0.0 |
entries | Chrome Full support 38 | Edge Full support 12 | Firefox Full support 28 | IE No support No | Opera Full support 25 | Safari Full support 8 | WebView Android Full support Yes | Chrome Android Full support 38 | Firefox Android Full support 28 | Opera Android Full support Yes | Safari iOS Full support 8 | Samsung Internet Android Full support Yes | nodejs Full support 0.12 |
every | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1.5 | IE Full support 9 | Opera Full support Yes | Safari Full support 3 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
fill | Chrome Full support 45 | Edge Full support 12 | Firefox Full support 31 | IE No support No | Opera Full support Yes | Safari Full support 8 | WebView Android Full support Yes | Chrome Android Full support 45 | Firefox Android Full support 31 | Opera Android Full support Yes | Safari iOS Full support 8 | Samsung Internet Android Full support Yes | nodejs
Full support
4.0.0
|
filter | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1.5 | IE Full support 9 | Opera Full support Yes | Safari Full support 3 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
find | Chrome Full support 45 | Edge Full support 12 | Firefox Full support 25 | IE No support No | Opera Full support 32 | Safari Full support 8 | WebView Android Full support Yes | Chrome Android Full support 45 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 8 | Samsung Internet Android Full support Yes | nodejs
Full support
4.0.0
|
findIndex | Chrome Full support 45 | Edge Full support 12 | Firefox Full support 25 | IE No support No | Opera Full support 32 | Safari Full support 8 | WebView Android Full support Yes | Chrome Android Full support 45 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 8 | Samsung Internet Android Full support Yes | nodejs
Full support
4.0.0
|
flat | Chrome Full support 69 | Edge No support No | Firefox Full support 62 | IE No support No | Opera Full support 56 | Safari Full support 12 | WebView Android Full support 69 | Chrome Android Full support 69 | Firefox Android Full support 62 | Opera Android Full support 48 | Safari iOS Full support 12 | Samsung Internet Android Full support 10.0 | nodejs Full support 11.0.0 |
flatMap | Chrome Full support 69 | Edge No support No | Firefox Full support 62 | IE No support No | Opera Full support 56 | Safari Full support 12 | WebView Android Full support 69 | Chrome Android Full support 69 | Firefox Android Full support 62 | Opera Android Full support 48 | Safari iOS Full support 12 | Samsung Internet Android Full support 10.0 | nodejs Full support 11.0.0 |
forEach | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1.5 | IE Full support 9 | Opera Full support Yes | Safari Full support 3 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
from | Chrome Full support 45 | Edge Full support 12 | Firefox Full support 32 | IE No support No | Opera Full support Yes | Safari Full support 9 | WebView Android Full support 45 | Chrome Android Full support 45 | Firefox Android Full support 32 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes | nodejs Full support 4.0.0 |
includes | Chrome Full support 47 | Edge Full support 14 | Firefox Full support 43 | IE No support No | Opera Full support 34 | Safari Full support 9 | WebView Android Full support Yes | Chrome Android Full support 47 | Firefox Android Full support 43 | Opera Android Full support 34 | Safari iOS Full support 9 | Samsung Internet Android Full support Yes | nodejs
Full support
6.0.0
|
indexOf | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1.5 | IE Full support 9 | Opera Full support Yes | Safari Full support 3 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
isArray | Chrome Full support 5 | Edge Full support 12 | Firefox Full support 4 | IE Full support 9 | Opera Full support 10.5 | Safari Full support 5 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes | nodejs Full support Yes |
join | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
keys | Chrome Full support 38 | Edge Full support 12 | Firefox Full support 28 | IE No support No | Opera Full support 25 | Safari Full support 8 | WebView Android Full support Yes | Chrome Android Full support 38 | Firefox Android Full support 28 | Opera Android Full support Yes | Safari iOS Full support 8 | Samsung Internet Android Full support Yes | nodejs Full support 0.12 |
lastIndexOf | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1.5 | IE Full support 9 | Opera Full support Yes | Safari Full support 3 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
length | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 4 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
map | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1.5 | IE Full support 9 | Opera Full support Yes | Safari Full support 3 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
observe | Chrome No support 36 — 52 | Edge No support No | Firefox No support No | IE No support No | Opera No support No | Safari No support No | WebView Android No support No | Chrome Android No support No | Firefox Android No support No | Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No | nodejs No support No |
of | Chrome Full support 45 | Edge Full support 12 | Firefox Full support 25 | IE No support No | Opera Full support Yes | Safari Full support 9 | WebView Android Full support Yes | Chrome Android Full support 39 | Firefox Android Full support 25 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support 4.0 | nodejs Full support 4.0.0 |
pop | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
prototype | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 4 | Opera Full support Yes | Safari Full support 3 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
push | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
reduce | Chrome Full support 3 | Edge Full support 12 | Firefox Full support 3 | IE Full support 9 | Opera Full support 10.5 | Safari Full support 4.1 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 4 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
reduceRight | Chrome Full support 3 | Edge Full support 12 | Firefox Full support 3 | IE Full support 9 | Opera Full support 10.5 | Safari Full support 4.1 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 4 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
reverse | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
shift | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
slice | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 4 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
some | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1.5 | IE Full support 9 | Opera Full support Yes | Safari Full support 3 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
sort | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
splice | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE
Full support
5.5
| Opera Full support Yes | Safari Full support 1 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
toLocaleString | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
toSource | Chrome No support No | Edge No support No | Firefox Full support 1 | IE No support No | Opera No support No | Safari No support No | WebView Android No support No | Chrome Android No support No | Firefox Android Full support 4 | Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No | nodejs No support No |
toString | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 4 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support ≤37 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
unobserve | Chrome No support 36 — 52 | Edge No support No | Firefox No support No | IE No support No | Opera No support No | Safari No support No | WebView Android No support No | Chrome Android No support No | Firefox Android No support No | Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No | nodejs No support No |
unshift | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 5.5 | Opera Full support Yes | Safari Full support 1 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support 1 | Samsung Internet Android Full support Yes | nodejs Full support Yes |
values | Chrome Full support 66 | Edge Full support 12 | Firefox Full support 60 | IE No support No | Opera Full support 53 | Safari Full support 9 | WebView Android Full support 66 | Chrome Android Full support 66 | Firefox Android Full support 60 | Opera Android Full support 47 | Safari iOS Full support 9 | Samsung Internet Android Full support 9.0 | nodejs
Full support
10.9.0
|
@@iterator | Chrome Full support 38 | Edge Full support 12 | Firefox
Full support
36
| IE No support No | Opera Full support 25 | Safari Full support 10 | WebView Android Full support Yes | Chrome Android Full support 38 | Firefox Android
Full support
36
| Opera Android Full support Yes | Safari iOS Full support 10 | Samsung Internet Android Full support Yes | nodejs Full support 0.12 |
@@species | Chrome Full support 51 | Edge No support No | Firefox Full support 48 | IE No support No | Opera Full support 38 | Safari Full support 10 | WebView Android Full support 51 | Chrome Android Full support 51 | Firefox Android Full support 48 | Opera Android Full support 41 | Safari iOS Full support 10 | Samsung Internet Android Full support 5.0 | nodejs
Full support
6.5.0
|
@@unscopables | Chrome Full support 38 | Edge Full support 12 | Firefox Full support 48 | IE No support No | Opera Full support 25 | Safari Full support 10 | WebView Android Full support 38 | Chrome Android Full support 38 | Firefox Android Full support 48 | Opera Android Full support 25 | Safari iOS Full support 10 | Samsung Internet Android Full support 3.0 | nodejs Full support 0.12 |
Legend
- Full support
- Full support
- No support
- No support
- Non-standard. Expect poor cross-browser support.
- Non-standard. Expect poor cross-browser support.
- Deprecated. Not for use in new websites.
- Deprecated. Not for use in new websites.
- See implementation notes.
- See implementation notes.
- User must explicitly enable this feature.
- User must explicitly enable this feature.
- Uses a non-standard name.
- Uses a non-standard name.