๐ 1~10๊น์ง ๋ฐฐ์ด
let arr = [1,2,3,4,5,6,7,8,9,10]; arr.map(item => item);
๊ฒฐ๊ณผ
[ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]
๐ 1~10๊น์ง 1์ ๋ํด์ฃผ๋ ๋ฐฐ์ด
let arr = [1,2,3,4,5,6,7,8,9,10]; arr.map(item => item+1);
๊ฒฐ๊ณผ
[ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 ]
๐ json ํํ
let arr = [1,2,3,4,5,6,7,8,9,10]; arr.map((item,index)=>{ return { "number":item, "idx":index } });
๊ฒฐ๊ณผ
[ { number: 1, idx: 0 }, { number: 2, idx: 1 }, { number: 3, idx: 2 }, { number: 4, idx: 3 }, { number: 5, idx: 4 }, { number: 6, idx: 5 }, { number: 7, idx: 6 }, { number: 8, idx: 7 }, { number: 9, idx: 8 }, { number: 10, idx: 9 } ]
๐ 6์ด์์ ๋ฐฐ์ด
let arr = [1,2,3,4,5,6,7,8,9,10]; arr.filter(item => item>5);
๊ฒฐ๊ณผ
[ 6, 7, 8, 9, 10 ]
๐ 3์ ๋๋์์ ๋ ๋๋์ด ๋จ์ด์ง๋ ๋ฐฐ์ด
let arr = [1,2,3,4,5,6,7,8,9,10]; arr.filter(item=>{ if(item % 3 === 0) return true; });
๊ฒฐ๊ณผ
[ 3, 6, 9 ]
๐ every
let arr = [1,2,3,4,5,6,7,8,9,10]; arr.every(item => item > 1); arr.every(item => item > 0);
๊ฒฐ๊ณผ
false true