The values() method returns a new array iterator object that contains the values for each index in the array.
Array.prototype.values()
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Syntax
values()
Return value
A new Array iterator object.
Examples
Iteration using for...of loop
const arr = ['a', 'b', 'c', 'd', 'e']; const iterator = arr.values(); for (let letter of iterator) { console.log(letter); } //"a" "b" "c" "d" "e"
Array.prototype.values is default implementation of Array.prototype[Symbol.iterator].
Array.prototype.values === Array.prototype[Symbol.iterator] // true
Iteration using .next()
const arr = ['a', 'b', 'c', 'd', 'e']; const iterator = arr.values(); iterator.next(); // Object { value: "a", done: false } iterator.next().value; // "b" iterator.next()["value"]; // "c" iterator.next(); // Object { value: "d", done: false } iterator.next(); // Object { value: "e", done: false } iterator.next(); // Object { value: undefined, done: true } iterator.next().value; // undefined
Warning: The array iterator object is one use or temporary object
example:
const arr = ['a', 'b', 'c', 'd', 'e']; const iterator = arr.values(); for (let letter of iterator) { console.log(letter); } //"a" "b" "c" "d" "e" for (let letter of iterator) { console.log(letter); } // undefined
reason: When next().done=true or currentIndex>length the for..of loop ends. See Iteration protocols.
Value: there are no values stored in the array Iterator object; instead it stores the address of the array used in its creation and so depends on the values stored in that array.
const arr = ['a', 'b', 'c', 'd', 'e']; const iterator = arr.values(); console.log(iterator); // Array Iterator { } iterator.next().value; // "a" arr[1] = 'n'; iterator.next().value; // "n"
Note: If the values in the array changed the array iterator object values change too.
Specifications
Browser compatibility
| Desktop | Mobile | Server | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
values |
66
|
12
|
60
|
No
|
53
|
9
|
66
|
66
|
60
|
47
|
9
|
9.0
|
1.0
|
10.9.0
6.5.0
The
--harmony-array-prototype-values flag is required; the
--harmony flag is not sufficient in this case.
0.12.0-4.0.0
|
See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/values
