Array.prototype.reverse 3 methods

gistfile1.js

           Array.prototype.reverse1 = function() {
                 var stack = [],
                     n = this.length
                 for(var i=n-1;i>=0;i--) {
                     stack.push(this[i]) 
                 }
             return stack
           } 
           Array.prototype.reverse2 = function() {
                 var i = 0,
                     n = this.length,
                     j = n - 1;
                     while(i<j) {
                         aux = arr[i]
                         arr[i] = arr[j]
                         arr[j] = aux 
                         i++;j--;
                     }
               return this
           } 
           Array.prototype.reverse3 = function() {
                   var middle = this.length/2,
                       n = this.length-1
                   for(var i=0;i<middle;i++) {
                       aux = this[i]
                       this[i] = this[n-i]
                       this[n-i] = aux
                   }
             return this
           }               
           var arr = [1,2,3,4,5,6,7,8,9,-1,-2] 
           console.log(arr.reverse3())