P.js

var $ = {};		// jQuery? or prototype.js?
$.P = function () {
	var $_ = arguments,
		i = 1,
		len = arguments.length,
		args = [];

	var toString = Object.prototype.toString;

	if (toString.call(arguments[0]) !== "[object Function]")
		throw "Please pass the first argument is the function";

	for (; i<len; ++i) {
		if (toString.call(arguments[i]) === "[object Function]") {
			args.push(arguments[i].call($_));
			continue;
		}

		args.push(arguments[i]);
	}

	$_[0].apply($_, args);
}

$.P(function(arg1, arg2, arg3, arg4) {
	console.log(arg1);
	console.log(arg2);
	console.log(arg3);
	console.log(arg4);
}, "hoge1", "hoge2", "hoge3", function() {
	var foo = [];
	for (var i=0; i<3; ++i) {
		foo.push("foo" + i);
	}
	return foo.join(" ");
});

$.P("bar");		// error