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Map.prototype.set()

Baseline Widely available

This feature is well established and works across many devices and browser versions. Itโ€™s been available across browsers since โจ2015๋…„ 7์›”โฉ.

Map ์ธ์Šคํ„ด์Šค์˜ set() ๋ฉ”์„œ๋“œ๋Š” ์ด Map์—์„œ ๋ช…์‹œ๋œ ํ‚ค์™€ ๊ฐ’์„ ์ถ”๊ฐ€ํ•˜๊ฑฐ๋‚˜ ๊ฐฑ์‹ ํ•ฉ๋‹ˆ๋‹ค.

์‹œ๋„ํ•ด ๋ณด๊ธฐ

const map1 = new Map();
map1.set("bar", "foo");

console.log(map1.get("bar"));
// Expected output: "foo"

console.log(map1.get("baz"));
// Expected output: undefined

๊ตฌ๋ฌธ

js
set(key, value)

๋งค๊ฐœ๋ณ€์ˆ˜

key

Map ๊ฐ์ฒด์— ์ถ”๊ฐ€๋˜๋Š” ์š”์†Œ์˜ ํ‚ค. ์ด ํ‚ค๋Š” ๋ชจ๋“  ์ข…๋ฅ˜์˜ JavaScript ์œ ํ˜•(๋ชจ๋“  ์›์‹œํ˜• ํ˜น์€ ๋ชจ๋“  Javascript ๊ฐ์ฒด)๊ฐ€ ๋  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

value

Map ๊ฐ์ฒด์— ์ถ”๊ฐ€๋˜๋Š” ์š”์†Œ์˜ ๊ฐ’. ์ด ๊ฐ’์€ ๋ชจ๋“  ์ข…๋ฅ˜์˜ JavaScript ์œ ํ˜•(๋ชจ๋“  ์ข…๋ฅ˜์˜ ์›์‹œํ˜• ํ˜น์€ ๋ชจ๋“  ์ข…๋ฅ˜์˜ Javascript ๊ฐ์ฒด)๊ฐ€ ๋  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

๋ฐ˜ํ™˜ ๊ฐ’

Map ๊ฐ์ฒด.

์˜ˆ์ œ

set() ์‚ฌ์šฉํ•˜๊ธฐ

js
const myMap = new Map();

// map์— ์ƒˆ๋กœ์šด ์š”์†Œ๋ฅผ ์ถ”๊ฐ€ํ•ฉ๋‹ˆ๋‹ค
myMap.set("bar", "foo");
myMap.set(1, "foobar");

// map์— ์š”์†Œ๋ฅผ ๊ฐฑ์‹ ํ•ฉ๋‹ˆ๋‹ค
myMap.set("bar", "baz");

์—ฐ์†์œผ๋กœ set() ์‚ฌ์šฉ

set()๋ฉ”์„œ๋“œ๋Š” ๊ฐ™์€ Map ๊ฐ์ฒด๋ฅผ ๋ฐ˜ํ™˜ํ•˜๊ธฐ ๋•Œ๋ฌธ์— ์•„๋ž˜์™€ ๊ฐ™์ด ์—ฐ์†์œผ๋กœ ํ˜ธ์ถœํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

js
// ์—ฐ์†์ ์œผ๋กœ ์ƒˆ๋กœ์šด ์š”์†Œ๋ฅผ ์ถ”๊ฐ€ํ•ฉ๋‹ˆ๋‹ค.
myMap.set("bar", "foo").set(1, "foobar").set(2, "baz");

๋ช…์„ธ์„œ

Specification
ECMAScriptยฎ 2026 Language Specification
# sec-map.prototype.set

๋ธŒ๋ผ์šฐ์ € ํ˜ธํ™˜์„ฑ

๊ฐ™์ด ๋ณด๊ธฐ