Preparation code

<script>
  var Thing = function () {
    this.hasMass = true;
  };
  Thing.prototype = { holy: 'object', batman: '!' };
  Thing.prototype.constructor = Thing;
  
  var Rock = function () {
    this.hard = 'very';
  };
  Rock.prototype = new Thing();
  Rock.constructor = Rock;
  
  
</script>

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var newRock = new Rock();
 

var otherRock = Object.create(Rock.prototype);
Rock.call(otherRock);

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