Baseline Widely available
add()
ã¡ã½ããã¯ãæ°ããè¦ç´ ã WeakSet
ãªãã¸ã§ã¯ãã®æå¾ã«è¿½å ãã¾ãã
const weakset1 = new WeakSet();
const object1 = {};
weakset1.add(object1);
console.log(weakset1.has(object1));
// Expected output: true
try {
weakset1.add(1);
} catch (error) {
console.log(error);
// Expected output (Chrome): TypeError: Invalid value used in weak set
// Expected output (Firefox): TypeError: WeakSet value must be an object, got 1
// Expected output (Safari): TypeError: Attempted to add a non-object key to a WeakSet
}
æ§æ 弿°
value
å¿
é ã WeakSet
ã³ã¬ã¯ã·ã§ã³ã«è¿½å ããè¦ç´ ã®å¤ã§ãã
WeakSet
ãªãã¸ã§ã¯ãã§ãã
var ws = new WeakSet();
ws.add(window); //window ãªãã¸ã§ã¯ãã WeakSet ã¸è¿½å
ws.has(window); // true
// WeakSet ã¯å¼æ°ã¨ãã¦ãªãã¸ã§ã¯ãã®ã¿ãåãã¾ãã
ws.add(1);
// çµæã¯ "TypeError: Invalid value used in weak set" (Chrome)
// "TypeError: 1 is not a non-null object" (Firefox)
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