MooTools contains a robust Class creation and inheritance system that resembles most classically based Object-oriented programming languages. For example, the following is MooTools' equivalent of the examples in Wikipedia's polymorphism page:
var Animal = new Class({
initialize: function (name) {
this.name = name;
}
});
var Cat = new Class({
Extends: Animal,
talk: function () {
return 'Meow!';
}
});
var Dog = new Class({
Extends: Animal,
talk: function () {
return 'Arf! Arf!';
}
});
var animals = {
a: new Cat('Missy'),
b: new Cat('Mr. Bojangles'),
c: new Dog('Lassie')
};
Object.each(animals, function (animal) {
alert(animal.name + ': ' + animal.talk());
});
// alerts the following:
//
// Missy: Meow!
// Mr. Bojangles: Meow!
// Lassie: Arf! Arf!
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