Immutable - change elements in array with slice (no splice)

Question

How is possible to change 3/4 elements? Expected output is [1,2,4,3,5]

let list = [1,2,3,4,5];
const removeElement = list.indexOf(3); // remove number 3
list         


        

Answer 1

The simplest way to write this is to use the spread operator:

let newList = [...list.slice(0, 2), list[4], list[3], ...list.slice(4)];