how to get array from number length

1//here is how to get an array from the length of a number
2// for example you want to get [1,2,3,4,5] from the integer 5.
3
4let arr = []
5let i = 5
6for (let j = 0 ; j < i + 1 ; j++ ) {
7    arr.push(j)
8    }