Baseline Widely available
Object.fromEntries()
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const entries = new Map([
["foo", "bar"],
["baz", 42],
]);
const obj = Object.fromEntries(entries);
console.log(obj);
// Expected output: Object { foo: "bar", baz: 42 }
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Object.fromEntries(iterable)
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iterable
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説æObject.fromEntries()
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ç®ãã使ãããããããã£ãæã¤æ°ãããªãã¸ã§ã¯ããè¿ãã¾ãã iterable
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Object.fromEntries()
㯠Object.entries()
ã®éã®åä½ããã¾ããã Object.entries()
ã¯æååãã¼ã®ããããã£ããè¿ããªãã®ã«å¯¾ãã Object.fromEntries()
ã¯ã·ã³ãã«ãã¼ã®ããããã£ã使ãããã¨ãã§ãã¾ãã
ã¡ã¢: Array.from()
ã¨ç°ãªãã Object.fromEntries()
㯠this
ã®å¤ã使ç¨ããªãã®ã§ãä»ã®ã³ã³ã¹ãã©ã¯ã¿ã¼ã§å¼ã³åºãã¦ããã®åã®ãªãã¸ã§ã¯ãã¯ä½æããã¾ããã
Object.fromEntries
ã§ã¯ã Map
ã Object
ã«å¤æãããã¨ãã§ãã¾ãã
const map = new Map([
["foo", "bar"],
["baz", 42],
]);
const obj = Object.fromEntries(map);
console.log(obj); // { foo: "bar", baz: 42 }
Array ãã Object ã¸ã®å¤æ
Object.fromEntries
ã§ã¯ã Array
ã Object
ã«å¤æãããã¨ãã§ãã¾ãã
const arr = [
["0", "a"],
["1", "b"],
["2", "c"],
];
const obj = Object.fromEntries(arr);
console.log(obj); // { 0: "a", 1: "b", 2: "c" }
ãªãã¸ã§ã¯ãã®å¤å½¢
Object.fromEntries
ãéã®ã¡ã½ãã Object.entries()
ãé
åæä½ã¡ã½ããã使ç¨ãã¦ã以ä¸ã®ããã«ãªãã¸ã§ã¯ããå¤å½¢ãããã¨ãã§ãã¾ãã
const object1 = { a: 1, b: 2, c: 3 };
const object2 = Object.fromEntries(
Object.entries(object1).map(([key, val]) => [key, val * 2]),
);
console.log(object2);
// { a: 2, b: 4, c: 6 }
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