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[Search] ๊ฒ€์ƒ‰ ์œ ํ˜• ์‚ฌ์ดํŠธ ๋งŒ๋“ค๊ธฐ02 includes()๋ฅผ ํ†ตํ•ด ๊ฒ€์ƒ‰ ์‚ฌ์ดํŠธ ์ œ์ž‘ํ•˜๊ธฐ ์ด๋ฒˆ ์‹œ๊ฐ„์—๋Š” ๋ฌธ์ž์—ด ๋ฉ”์„œ๋“œ ์ค‘ ํ•˜๋‚˜์ธ includes() ๋ฉ”์„œ๋“œ๋ฅผ ํ†ตํ•ด ๊ฒ€์ƒ‰ ์‚ฌ์ดํŠธ๋ฅผ ์ œ์ž‘ํ•ด๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค! ๋จผ์ € includes() ๋ฉ”์„œ๋“œ์— ๋Œ€ํ•ด ์งง๊ฒŒ ์•Œ์•„๋ณด๊ณ  ์‚ฌ์ดํŠธ ์‹ค์Šต์— ๋“ค์–ด๊ฐ€๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค! #1. includes() includes() ๋ฉ”์„œ๋“œ๋Š” ๋Œ€์†Œ๋ฌธ์ž๋ฅผ ๊ตฌ๋ถ„ํ•˜๋ฉฐ ๋ฌธ์ž์—ด ๋‚ด์—์„œ ๊ฒ€์ƒ‰ํ•  ๋ฌธ์ž์˜ ํฌํ•จ ์—ฌ๋ถ€์— ๋”ฐ๋ผ ๋ถˆ๋ฆฐ(true, false)์„ ๋ฐ˜ํ™˜ํ•ฉ๋‹ˆ๋‹ค. โœ๏ธ์˜ˆ์ œ ์ฝ”๋“œ const str1 = "javascript reference"; const currentStr1 = str1.includes("javascript"); // true const currentStr2= str1.includes("j"); // true const currentStr3= str1.. 2022. 8. 17.
[Search] ๊ฒ€์ƒ‰ ์œ ํ˜• ์‚ฌ์ดํŠธ ๋งŒ๋“ค๊ธฐ01 indexOf()๋ฅผ ํ†ตํ•ด ๊ฒ€์ƒ‰ ์‚ฌ์ดํŠธ ์ œ์ž‘ํ•˜๊ธฐ ์ง€๋‚œ ์‹œ๊ฐ„์—๋Š” indexOf()์— ๋Œ€ํ•ด ์•Œ์•„๋ณด์•˜์Šต๋‹ˆ๋‹ค. ์ด๋ฒˆ ์‹œ๊ฐ„์—๋Š” ์‹ฌํ™”๊ณผ์ •์œผ๋กœ ๋ฌธ์ž์—ด ๋ฉ”์„œ๋“œ ์ค‘ ํ•˜๋‚˜์ธ indexOf() ๋ฉ”์„œ๋“œ๋ฅผ ํ†ตํ•ด ๊ฒ€์ƒ‰ ์‚ฌ์ดํŠธ๋ฅผ ์ œ์ž‘ํ•ด๋ณผ๊นŒ์š”?! ๋จผ์ € indexOf() ๋ฉ”์„œ๋“œ์— ๋Œ€ํ•ด ์งง๊ฒŒ ์•Œ์•„๋ณด๊ณ  ์‚ฌ์ดํŠธ ์‹ค์Šต์— ๋“ค์–ด๊ฐ€๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค! #1. indexOf() indexOf() ๋ฉ”์„œ๋“œ๋Š” ๋ฌธ์ž์—ด์—์„œ ํŠน์ • ๋ฌธ์ž์˜ ์œ„์น˜(index)๋ฅผ ์ฐพ์€ ํ›„ ์ˆซ์ž๋กœ ๋ฐ˜ํ™˜ํ•ฉ๋‹ˆ๋‹ค. โœ๏ธ์ฝ”๋“œ ๋ณด๊ธฐ const str1 = "javascript reference" const currentStr1 = str1.indexOf("javascript"); // 0 const currentStr2 = str1.indexOf("reference"); // 11 (11๋ฒˆ์งธ ์ž๋ฆฌ : .. 2022. 8. 17.
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