Javascript Array mostCommon()

/**/*  ww  w .j  a va 2  s .  c  om*/
@Name: Array.prototype.mostCommon
@Author: Paul Visco
@Version: 1.1 11/19/07
@Description: Finds the most common value in an array.  If no value is most common then it returns false.

@Return: String/Number/Object Returns the most common value in the array or false if no value is most common.
@Example:

var myArray = [5, 10, 15];
var answer = myArray.mostCommon();
//answer = false;

var myArray = [5, 5, 10, 15];
var answer = myArray.mostCommon();
//answer = 5;
*/
Array.prototype.mostCommon = function(){
 var count=0,max=0,num=0,mode=0;
 this.sort();
 this.forEach(function(v){
  
  if(num != v){
   num=v;
   count=1;
  } else {
   count++;
  }
  
  if(count > max){
   max = count;
   mode = num;
  }
 });
 if(max ==1){mode = false;}
 return mode;
};