[0, 0, 0 …. 0]

Array.from 활용

// 1
const arr = Array.from(Array(len), () => 0)
// 2 
const arr = Array.from({ length: len }, () => 0);

fill 활용

const arr = new Array(len).fill(0);

[0, 1, 2, … N]

spread 활용

const arr = [... Array(10).keys()]

Array.from 활용

// 1
const arr = Array.from(Array(len), (_, idx) => idx)
// 2
const arr = Array.from(Array(len).keys())
// 3
const arr = Array.from({length: len}, (_, i) => i)

map 활용

const arr = Array(len).fill().map((_, i) => i);

[

[0, 0, 0… 0], … [0, 0, 0… 0], ]