Set.prototype[@@iterator]() - JavaScript 编辑

@@iterator 属性的初始值和 values 属性的初始值是同一个函数。

const set1 = new Set();

set1.add(42);
set1.add('forty two');

const iterator1 = set1[Symbol.iterator]();

console.log(iterator1.next().value);
// expected output: 42

console.log(iterator1.next().value);
// expected output: "forty two"

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Syntax

mySet[Symbol.iterator]

Return value

返回 Set iterator 函数，默认值是 values() 函数。

Examples

Using [@@iterator]()

const mySet = new Set();
mySet.add('0');
mySet.add(1);
mySet.add({});

const setIter = mySet[Symbol.iterator]();

console.log(setIter.next().value); // "0"
console.log(setIter.next().value); // 1
console.log(setIter.next().value); // Object

Using [@@iterator]() with for..of

const mySet = new Set();
mySet.add('0');
mySet.add(1);
mySet.add({});

for (const v of mySet) {
  console.log(v);
}

Specifications

Browser compatibility

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The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

See also

• Set.prototype.entries()
• Set.prototype.keys()
• Set.prototype.values()