Eloquent Javascript: Reversing an Array

reversearray.js

/* For this exercise, write two functions, reverseArray and 
reverseArrayInPlace. The first, reverseArray, takes an array
as argument and produces a new array that has the same 
elements in the inverse order. The second, reverseArrayInPlace, 
does what the reverse method does: it modifies the array given 
as argument in order to reverse its elements. Neither may use 
the standard reverse method. */

function reverseArray(array) {
  var newArray = [];
  for (var i = 0; i < array.length; i++) {
    newArray.unshift(array[i]);
  }  
  return newArray;
}

function reverseArrayInPlace(array) {
  var temp = [];
  for (var i = 0; i < Math.floor(array.length/2);i++) {
    temp[i] = array[i]; //save first part of array, so it won't be overwritten
    array[i] = array[array.length - 1 - i]; //replace one of the elements in the first half of the array with the corresponding element in the back half of the array
    array[array.length - 1 - i] = temp[i]; //replace one of the elements in the back half of the array with the corresponding element in the first half of the array that was placed in safekeeping in a temporary variable
	}
  return array;
}

console.log(reverseArray(["A", "B", "C"]));
// → ["C", "B", "A"];
var arrayValue = [1, 2, 3, 4, 5];
reverseArrayInPlace(arrayValue);
console.log(arrayValue);
// → [5, 4, 3, 2, 1]