Map.prototype[@@iterator]()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

O valor inicial da propriedade @@iterator é o mesmo objeto função que o valor inicial do método entries

Experimente

const map1 = new Map();

map1.set("0", "foo");
map1.set(1, "bar");

const iterator1 = map1[Symbol.iterator]();

for (const item of iterator1) {
  console.log(item);
}
// Expected output: Array ["0", "foo"]
// Expected output: Array [1, "bar"]

Sintaxe

js
myMap[Symbol.iterator];

Valor retornado

A função iterativa do map, que é a entries() por padrão

Exemplos

Usando o [@@iterator]()

js
const myMap = new Map();
myMap.set("0", "foo");
myMap.set(1, "bar");
myMap.set({}, "baz");

const mapIter = myMap[Symbol.iterator]();

console.log(mapIter.next().value); // ["0", "foo"]
console.log(mapIter.next().value); // [1, "bar"]
console.log(mapIter.next().value); // [Object, "baz"]

Usando o [@@iterator]() com for..of

js
const myMap = new Map();
myMap.set("0", "foo");
myMap.set(1, "bar");
myMap.set({}, "baz");

for (const entry of myMap) {
  console.log(entry);
}
// ["0", "foo"]
// [1, "bar"]
// [{}, "baz"]

for (const [key, value] of myMap) {
  console.log(`${key}: ${value}`);
}
// 0: foo
// 1: bar
// [Object]: baz

Especificações

Specification
ECMAScript® 2025 Language Specification
# sec-map.prototype-%symbol.iterator%

Compatibilidade com navegadores

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
[Symbol.iterator]

Legend

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Full support
Full support
Uses a non-standard name.
Has more compatibility info.

Veja também