如何在 30 个字节内反转没有 reverse() 的数组

Question

Reverse an array, return the result. Do whatever you want with the original array. Don't use Array.prototype.reverse.

You have 30 bytes to spare.

Example: [1, 2, 3] → [3, 2, 1]

And this time you won't be able to do the thing from that kata.

require isn't allowed as well.

Answer 1

You can create a copy of the input array, map over it, and use pop to get (and remove) the current last element of the original array.

 // 27 bytes f=a=>[...a].map(x=>a.pop()) console.log(f([1,2,3]));