WeakMap.prototype.set()
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.
set()
メソッドは、指定されたキーと値をもつ新しい要素を WeakMap
オブジェクトへ追加します。
試してみましょう
const weakmap1 = new WeakMap();
const object1 = {};
const object2 = {};
weakmap1.set(object1, "foo");
weakmap1.set(object2, "bar");
console.log(weakmap1.get(object1));
// Expected output: "foo"
console.log(weakmap1.get(object2));
// Expected output: "bar"
構文
wm.set(key, value);
引数
返値
WeakMap
オブジェクトです。
例
set() メソッドの使用
js
var wm = new WeakMap();
var obj = {};
// Add new elements to the WeakMap
wm.set(obj, "foo").set(window, "bar"); // chainable
// Update an element in the WeakMap
wm.set(obj, "baz");
仕様書
Specification |
---|
ECMAScript® 2025 Language Specification # sec-weakmap.prototype.set |
ブラウザーの互換性
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set |
Legend
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- Full support
- Full support
- See implementation notes.
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