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๋ชฉ๋กstudy/JavaScript๐ŸŒŸ (7)

cowboysj

[Javascript] ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ map() ํ•จ์ˆ˜

๋ฐ˜๋ณต๋ฌธ์„ ์“ธ ๋•Œ for๋ฌธ์„ ์ฃผ๋กœ ์“ฐ๋Š”๋ฐ map() ํ•จ์ˆ˜๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด ๋” ํŽธํ•˜๊ฒŒ array์—์„œ ๊ฐ’์„ ๊บผ๋‚ผ ์ˆ˜ ์žˆ๋‹ค, ์‚ฌ์šฉ ๋ฐฉ๋ฒ•์€ ๊ฐ„๋‹จํ•˜๊ฒŒ ๋ฐฐ์—ด.map()์— callback ํ•จ์ˆ˜๋ฅผ ๋„ฃ์–ด์ฃผ๋ฉด ๋œ๋‹ค! (๋‹น์—ฐํžˆ ํ™”์‚ดํ‘œ ํ•จ์ˆ˜๋„ ๊ฐ€๋Šฅ) arr.map(callback ํ•จ์ˆ˜) ์˜ˆ์ œ1 const arr = [1, 2, 3, 4, 5]; //์ผ๋ฐ˜ ํ•จ์ˆ˜ const map1 = arr.map(function(x){x+2)); //ํ™”์‚ดํ‘œ ํ•จ์ˆ˜ const map1 = arr.map(x=> x+2); console.log(map1); //[3,4,5,6,7] ์˜ˆ์ œ2 ์ฝœ๋ฐฑํ•จ์ˆ˜์˜ ํŒŒ๋ผ๋ฏธํ„ฐ๋Š” ๋‘ ๊ฐœ๊นŒ์ง€ ๋“ค์–ด๊ฐˆ ์ˆ˜ ์žˆ๋‹ค. ์œ„์˜ ์˜ˆ์ œ1์€ element ํ•˜๋‚˜๋งŒ ๋„ฃ์€ ๊ฑฐ๊ณ  index๊นŒ์ง€๋„ ๋„ฃ์„ ์ˆ˜ ์žˆ๋‹ค. const arr = [ 10, 20, 3..
study/JavaScript๐ŸŒŸ 2023. 7. 9. 03:03
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