Is there a way to use map() on an array in reverse order with javascript?

Question

I want to use the map() function on a javascript array, but I would like it to operate in reverse order.

The reason is, I\'m rendering stacked React co

Answer 1

Here is my TypeScript solution that is both O(n) and more efficient than the other solutions by preventing a run through the array twice:

function reverseMap(arg: T[], fn: (a: T) => O) {
   return arg.map((_, i, arr) => fn(arr[arr.length - i - 1]))
}

In JavaScript:

const reverseMap = (arg, fn) => arg.map((_, i, arr) => fn(arr[arr.length - 1 - i]))

// Or 

function reverseMap(arg, fn) {
    return arg.map((_, i, arr) => fn(arr[arr.length - i - 1]))
}