Map.prototype.entries()
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.
試してみましょう
const map1 = new Map();
map1.set("0", "foo");
map1.set(1, "bar");
const iterator1 = map1.entries();
console.log(iterator1.next().value);
// Expected output: Array ["0", "foo"]
console.log(iterator1.next().value);
// Expected output: Array [1, "bar"]
構文
js
entries()
引数
なし。
返値
新しい反復可能なイテレーターオブジェクトです。
例
entries() の使用
js
const myMap = new Map();
myMap.set("0", "foo");
myMap.set(1, "bar");
myMap.set({}, "baz");
const mapIter = myMap.entries();
console.log(mapIter.next().value); // ["0", "foo"]
console.log(mapIter.next().value); // [1, "bar"]
console.log(mapIter.next().value); // [Object, "baz"]
仕様書
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-map.prototype.entries |