Basic javascript Class object. No inheritance or anything like that but allows the nice encapsulation of properties and methods.

class.js

// The MIT License (MIT)
//
// Copyright (c) 2013, Nathan Reed
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

// Basic javascript Class object. No inheritance or anything like that
// but allows the nice encapsulation of properties and methods.
//
// Takes as its only argument an object with a set of methods for the 
// class. If there is a method called initialize, it will be used as the
// constructor.
//
// Usage:
//
// var Logger = new Class({
//   initialize: function(name) {
//     this.name = name;
//     console.log('init: ' + this.name);
//   },
//   
//   log: function(txt) {
//     console.log('log ' + this.name + ': ' + txt);
//   }
// });
//
var Class = function (obj) {
    obj = obj || {};

    var $Class = function () {
        var emptyFn = (function () { });
        (obj.initialize || emptyFn).apply(this, arguments);
    };

    for (k in obj) {
        if (obj.hasOwnProperty(k)) {
            var fn = obj[k];
            if (typeof fn == 'function') {
                $Class.prototype[k] = fn;
            }
        }
    };

    return $Class;
};