The initial value of the @@iterator
property is the same function object as the initial value of the values()
property.
arr[Symbol.iterator]()
The array iterator function, which is the values()
function by default.
for...of
loopvar arr = ['w', 'y', 'k', 'o', 'p']; var eArr = arr[Symbol.iterator](); // your browser must support for..of loop // and let-scoped variables in for loops for (let letter of eArr) { console.log(letter); }
var arr = ['w', 'y', 'k', 'o', 'p']; var eArr = arr[Symbol.iterator](); console.log(eArr.next().value); // w console.log(eArr.next().value); // y console.log(eArr.next().value); // k console.log(eArr.next().value); // o console.log(eArr.next().value); // p
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Array.prototype[@@iterator]()' in that specification. | Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) The definition of 'Array.prototype[@@iterator]()' in that specification. | Living Standard |
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 38 | ? |
361 17 — 274 |
No | 25 | Yes |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | Yes | Yes | ? | 36 | No | Yes | Yes |
1. The @@iterator
symbol is implemented.
2. A placeholder property named @@iterator
is used.
3. Supported as @@iterator
.
4. Supported as iterator
.
Array.prototype.keys()
Array.prototype.entries()
Array.prototype.forEach()
Array.prototype.every()
Array.prototype.some()
Array.prototype.values()
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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/@@iterator