$get.js

Array.implement({
  first: function() {
    return this[0];
  },
  
  rest: function() {
    return this.slice(1, this.length);
  },
  
  drop: function(n) {
    return this.slice(n, this.length);
  },
  
  isEmpty: function() {
    return this.length == 0;
  }
});

function $get(first, prop) {
  var args = $A(arguments);
  var rest = args.drop(2);
  var next;
  
  if(rest.length == 0) return first[prop];
  if(['object', 'array'].contains($type(first)))
  {
    next = first[prop];
  }

  return (next == null) ? null : $get.apply(null, [next].concat(rest));
};

// $get({"foo":["David", 1, 2]}, "foo", 0, 3) -> i
// $get({"foo":["David", 1, 2]}, "bar", 0, 3) -> null , note that this is a short circuit, we don't look for other values