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<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
var canyonCows = [
  {name: "Bessie", type: "cow", hadCalf: "Burt"},
  {name: "Donald", type: "bull", hadCalf: null},
  {name: "Esther", type: "calf", hadCalf: null},
  {name: "Burt", type: "calf", hadCalf: null},
  {name: "Sarah", type: "cow", hadCalf: "Esther"},
  {name: "Samson", type: "bull", hadCalf: null},
  {name: "Delilah", type: "cow", hadCalf: null}
];
Array.prototype.countCattle = function(kind) {
  var numKind = 0;
  for ( var i = 0; i<this.length; i++) {
    if (this[i].type == kind) { // IF THIS[ARRAY INDEX "i"].TYPE is equal to == kind then..
      numKind += 1;    // += (add 1 to...) numKind
    }
  }
  return numKind;
};
</script>


<script id="jsbin-source-javascript" type="text/javascript">var canyonCows = [
  {name: "Bessie", type: "cow", hadCalf: "Burt"},
  {name: "Donald", type: "bull", hadCalf: null},
  {name: "Esther", type: "calf", hadCalf: null},
  {name: "Burt", type: "calf", hadCalf: null},
  {name: "Sarah", type: "cow", hadCalf: "Esther"},
  {name: "Samson", type: "bull", hadCalf: null},
  {name: "Delilah", type: "cow", hadCalf: null}
];
Array.prototype.countCattle = function(kind) {
  var numKind = 0;
  for ( var i = 0; i<this.length; i++) {
    if (this[i].type == kind) { // IF THIS[ARRAY INDEX "i"].TYPE is equal to == kind then..
      numKind += 1;    // += (add 1 to...) numKind
    }
  }
  return numKind;
};</script></body>
</html>