What techniques can be used to define a class in JavaScript, and what are their trade-offs?

Question

I prefer to use OOP in large scale projects like the one I\'m working on right now. I need to create several classes in JavaScript but, if I\'m not mistaken, there are at le

Answer 1

A base

function Base(kind) {
    this.kind = kind;
}

A class

// Shared var
var _greeting;

(function _init() {
    Class.prototype = new Base();
    Class.prototype.constructor = Class;
    Class.prototype.log = function() { _log.apply(this, arguments); }
    _greeting = "Good afternoon!";
})();

function Class(name, kind) {
    Base.call(this, kind);
    this.name = name;
}

// Shared function
function _log() {
    console.log(_greeting + " Me name is " + this.name + " and I'm a " + this.kind);
}

Action

var c = new Class("Joe", "Object");
c.log(); // "Good afternoon! Me name is Joe and I'm a Object"