JSFiddle - React, Tailwind, and code Playground

CSS

#result {
  color: #f00;
}

JavaScript

function swap(a, b) {
  (a ^= b, b ^= a, a ^= b);
  return {
    a,
    b
  };
}

let arr = new Array(5).fill().map(_ => i++, i=0);
console.log(arr[2], arr[3]);
let {a, b} = swap(arr[2], arr[3]);
arr[2] = a; arr[3] = b;
console.log(arr[2], arr[3]);