Initialize Mootools class with parameters from array

Question

I have a Mootools class:

var Foo = new Class({
    initialize: function(param1, param2) {
        // do stuff
    }
});

The values to initialize Foo with are in an array:

a = ['value1', 'value2'];

How can I use the values from a to initialize an instance of Foo?

Answer 1

I'd go with extending the proto of the class so it does not care (see Felix' answer).

var Foo = new Class({
    initialize: function(param1, param2) {
        console.log(param1, param2);
    }
});

(function(){
    var oldFoo = Foo.prototype.initialize;
    Foo.implement({
        initialize: function(){
            var args = typeOf(arguments[0]) == 'array' ? arguments[0] : arguments;
            return oldFoo.apply(this, args);
        }
    });
}());


new Foo(['one', 'two']); // one two
new Foo('three', 'four'); // three four

It involves less hacking and is probably easier to understand/maintain than creating special constructor abstractions.

if you can, you can even do

var Foo2 = new Class({
     Extends: Foo,
     initialize: function () {
         var args = typeOf(arguments[0]) == 'array' ? arguments[0] : arguments;
         this.parent.apply(this, args);
     }
});

new Foo2(['one', 'two']);
new Foo2('three', 'four');

Thus, making a very clear abstraction without modifying the parent proto and expectation - and keeping pesky SOLID principles assholes happy :D