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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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/@@iterator