Schema for arguments, say goodbye to if's crazyness

argumentschema.js

ArgumentsSchema = function(args, schema, extra){
	var orderedArgs = {};

	for(var arg in args){
		for(var field in schema){
			if(schema.hasOwnProperty(field)){
				if(args[arg].constructor === schema[field]){
					orderedArgs[field] = args[arg];
				}
			}
		}
	}

	return orderedArgs;
}	
function msgNFn(){
	var args = ArgumentsSchema(arguments, {msg: String, fn: Function});

	args.fn(args.msg);
}

msgNFn(console.log.bind(console), "hey")
msgNFn("hey", console.log.bind(console));