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์ ์ฒด๋ณด๊ธฐ (131)JavaScript(15)programmers(10)level1(10)React(5)html(5)CSS(5)typescript(4)redux(4)๊ฐ๋ฐ์ผ๊ธฐ(2)lodash(2)switch(2)hooks(2)mini project(2)json(2)ESLint(2)object(2).env(2)์์๊ฐ(2)type(2)lifecycle(2)ํจ์คํธ์บ ํผ์ค(2)figma(2)react redux(2)TIL(1)scss(1)position(1)math(1)immutablility(1)MergeSort(1)BEM(1)API(1)lowDB(1)Portal(1)Graph(1)์ํฐ๋(1)useHistory(1)CRA(1)์์ด์ฝ(1)flex wrap(1)mac(1)classes(1)ํ๋ก ํธ์ค๋(1)stack/queue(1)slider(1)reduxjs/toolkit(1)operator(1)ํด์ปคํค(1)vue(1)vue.js(1)countingsort(1)errorBoundary(1)data-์์ฑ๋ช
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[KDT]FCFE - 4์ฃผ1์ผ JS MDN ์ฝ๊ธฐ
String.prototype.indexOf('์์น๋ฅผ์ฐพ์๊ธ์');: ์ฐพ๋ ๊ธ์์ ์์น๋ฅผ ์ซ์๋ก ์๋ ค์ค. ์์ผ๋ฉฐ -1 ๋ฐํ.๋ฌธ์ ๋ฐ์ดํฐ์ prototype์ผ๋ก ์๋ ํจ์๋String.indexOf('๊ธ์');ํ์์ผ๋ก ์ฌ์ฉํ ์ ์๋ค.let str = "hello worl
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