Javascript Array count(value)

// Test that a warning will occur when modifying a native object's prototype.

Array.prototype.count = function (value) {
 var count = 0, i;
 for (i = 0; i < this.length; ++i) {
  if (this[i] === value) {
   ++count;//from   w w  w .j  a  v  a 2  s.  c o m
  }
 }
 return count;
};

Boolean.prototype = {
 sup: function () {}
};

NonArray.prototype.random = function () {
 return 4;
};

// Test that a warning will occur when modifying a native object's prototype.

Array.prototype.count = function (value) {
  var count = 0, i;
  for (i = 0; i < this.length; ++i) {
    if (this[i] === value) {
      ++count;/*from   w  ww  .j  a  v  a  2s. com*/
    }
  }
  return count;
};