Javascript Array numberOfOccurrences(search)

// sol 1//w w  w  .jav  a  2  s .c  om

Array.prototype.numberOfOccurrences = function (search) {
  return this.filter(function (num) { return search === num }).length;
}

/**//from  ww w .j a v a 2  s.  c om
 * 7 kyu: Number Of Occurrences
 *
 * 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;
 */

Array.prototype.numberOfOccurrences = function(search) {
  return this.filter( function(num){ return search === num } ).length;
}