
stackoverflow.com
https://stackoverflow.com/questions/3746725/how-to…
How to create an array containing 1...N
We'll use that fact later. Array.apply(null, [undefined, undefined, undefined]) is equivalent to Array(undefined, undefined, undefined), which produces a three-element array and assigns undefined to each element. How can you generalize that to N elements? Consider how Array() works, which goes something like this: