[genezeta]

The final version of sortNumbers is:

    function sortNumbers(array: Readonly<Array<number>>) {
      return [...array].sort((a, b) => a - b)
    }

And sort sorts in place and then returns the sorted array[0]. So here the newly created [...array] is sorted and then returned by sort and then by the return at the start of that line.

[0] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...