Swap two array elements (JavaScript)

swaparrayelements.js

/**
* Swap the elements in an array at indexes x and y.
*
* @param (a) The array.
* @param (x) The index of the first element to swap.
* @param (y) The index of the second element to swap.
* @return {Array} A new array with the elements swapped.
*/
var swapArrayElements = function (a, x, y) {
  if (a.length === 1) return a;
  a.splice(y, 1, a.splice(x, 1, a[y])[0]);
  return a;
};
 
swapArrayElements([1, 2, 3, 4, 5], 1, 3); //=> [ 1, 4, 3, 2, 5 ]