Baseline Widely available
WeakSet
ã³ã³ã¹ãã©ã¯ã¿ã¼ã§ã WeakSet
ãªãã¸ã§ã¯ããçæããããã«å¼±ãåç
§ã§ãªãã¸ã§ã¯ããã³ã¬ã¯ã·ã§ã³ã§ä¿æãããã¨ãã§ãã¾ãã
å復å¯è½ãªãã¸ã§ã¯ããæ¸¡ãããå ´åããã¹ã¦ã®è¦ç´ ãæ°ãã WeakSet
ã«è¿½å ããã¾ãã null 㯠undefined ã¨ãã¦æ±ããã¾ãã
var ws = new WeakSet();
var foo = {};
var bar = {};
ws.add(foo);
ws.add(bar);
ws.has(foo); // true
ws.has(bar); // true
ws.delete(foo); // foo ã set ããåé¤
ws.has(foo); // false, foo ã¯å餿¸ã¿
ws.has(bar); // true, bar ã¯æ®ã£ã¦ãã
foo !== bar
ã§ãããã¨ã«æ³¨æãã¦ãã ããããããã¯ä¼¼ããªãã¸ã§ã¯ãã§ãããã¾ã£ããåããªãã¸ã§ã¯ãã§ã¯ããã¾ããããããã£ã¦ã両æ¹ã®ãªãã¸ã§ã¯ãã set ã«è¿½å ããã¾ãã
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