Javascript String mySub()

"use strict";/*from  www. jav a 2  s.c om*/

var bubble_sort = function(array){
 var  sorted = false;
 while(sorted == false){
  sorted = true;
  for(var i = 0; i<array.length-1; i++){
   if(array[i]>array[i+1]){
    var x = array[i];
    array[i] = array[i+1];
    array[i+1] = x;
    sorted = false;
   }
  } 
 }
 return array;
}

console.log(bubble_sort([6,10,1,6,2,1,1,5,2,6]));

String.prototype.mySub = function(){
 //"dog" => ["d","do","dog","o","og","g"]
 var outputArray =[];
 for(var i = 0; i<this.length; i++){
  for(var j = i+1; j<=this.length; j++){
   outputArray.push(this.substring(i,j));
  }
 }
 return outputArray;
}

console.log("face".mySub());