New prefilled array in one step.

How to create new prefilled array in JS?

Noob version:

const foo = new Array(5).fill(0).map((_, index) => index * 2) // [0, 2, 4, 6, 8]

Pro version:

const bar = Array.from({length: 5}, (_, index) => index * 2) // [0, 2, 4, 6, 8]

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