[Javascript] Array.prototype.fill()

const arr = Array(100).fill()
console.log(arr); // [ undefined,undefined,undefined,undefined,undefined ...]
console.log(arr.length); // 100

 

 

const arr = Array(10).fill('👍')// ['👍','👍','👍','👍','👍','👍','👍','👍','👍','👍']

 

 

숫자만큼 1부터 숫자까지 배열 만들기

const arr2 = Array(10).fill().map((_, i) => i+ 1)
console.log(arr2); // [1,2,3,4,5,6,7,8,9,10]