Javascript Array numberOfOccurrences(val)

Array.prototype.numberOfOccurrences = function(val) {
  
  var count = 0;/*from   w  ww .j av  a 2 s  .  c om*/
  for(var i = 0; i < this.length; i++){
    if(this[i] === val){
      count++;
    }   
  }
  return count;
}

/*//from www  . ja v  a 2s  .com
Description:

The numberOfOccurrences function must return the number of occurrences of an element in an array.

var arr = [0,1,2,2,3];
arr.numberOfOccurrences(0) === 1;
arr.numberOfOccurrences(4) === 0;
arr.numberOfOccurrences(2) === 2;
arr.numberOfOccurrences("a") === 0;

*/

///Solution///

Array.prototype.numberOfOccurrences = function(val) {
  var count = 0;
  for(var i=0;i<this.length;i++){
    if(val === this[i]){
      count += 1;
    }
  }
  return count;
}