philikon/prebound.html

## prebound.html
<!DOCTYPE html>
<html>
<head>
<script type="application/javascript;version=1.7">

/**
 * Proxy handler to automatically bind methods.
 */
function prebound(obj) {
  return {
    memoized: {},

    get: function get(receiver, name) {
      var func = obj[name];
      if (!func || typeof func != "function") {
        return func;
      }

      return this.memoized[name] || (this.memoized[name] = func.bind(receiver));
    },

    delete: function delete_(receiver, name) {
      delete obj[name];
      delete this.memoized[name];
    },

    set: function set(receiver, name, value) {
      obj[name] = value;
      delete this.memoized[name];
    }
  }
}

/**
 * Wraps a constructor function and injects a proxy that prebinds methods.
 */
function withPreboundMethods(ctor) {
  var callTrap = function(args) {}
  var constructTrap = function(args) {
    return Proxy.create(prebound(new ctor(args)), Object.prototype);
  };
  return Proxy.createFunction(ctor, callTrap, constructTrap);
}


/**
 * Example
 */
function Foobar() {}
Foobar.prototype = {

  method: function method() {
    console.log("Are we this yet?", this == f);
  }

};
Foobar = withPreboundMethods(Foobar);

var f = new Foobar();
var meth = f.method;
meth();

</script>
</head>

<body>
</body>
</html>
	<!DOCTYPE html>
	<html>
	<head>
	<script type="application/javascript;version=1.7">

	/**
	* Proxy handler to automatically bind methods.
	*/
	function prebound(obj) {
	return {
	memoized: {},

	get: function get(receiver, name) {
	var func = obj[name];
	if (!func \|\| typeof func != "function") {
	return func;
	}

	return this.memoized[name] \|\| (this.memoized[name] = func.bind(receiver));
	},

	delete: function delete_(receiver, name) {
	delete obj[name];
	delete this.memoized[name];
	},

	set: function set(receiver, name, value) {
	obj[name] = value;
	delete this.memoized[name];
	}
	}
	}

	/**
	* Wraps a constructor function and injects a proxy that prebinds methods.
	*/
	function withPreboundMethods(ctor) {
	var callTrap = function(args) {}
	var constructTrap = function(args) {
	return Proxy.create(prebound(new ctor(args)), Object.prototype);
	};
	return Proxy.createFunction(ctor, callTrap, constructTrap);
	}


	/**
	* Example
	*/
	function Foobar() {}
	Foobar.prototype = {

	method: function method() {
	console.log("Are we this yet?", this == f);
	}

	};
	Foobar = withPreboundMethods(Foobar);

	var f = new Foobar();
	var meth = f.method;
	meth();

	</script>
	</head>

	<body>
	</body>
	</html>