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 2015年7月.
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® 2026 Language Specification # sec-weakmap.prototype.set |
ブラウザーの互換性
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