/**
 * Read FAQs section on the left for more information on how to use the editor
**/
/**
 * DO NOT CHANGE FUNCTION NAME
 */

function customReverse() {
  // DO NOT REMOVE
  'use strict';
  
  function swap(a,b){
    let temp = a
    a = b
    b = temp
  }

  // write your code below
  let i = 0
  let j = this.length
  
  while(i < j){
    swap(this[i], this[j])
    i++
    j--
  }
  return this
}

Array.prototype.customReverse = customReverse;