Simple JavaScript Module Pattern

Safer Module.example.js

function MyClass(){
    if (this instanceof MyClass){
        this.init.apply(this, arguments);
    } else {
        MyClass.from(arguments[0])
    }
}

MyClass.from = function(object){
    // convert object into a MyClass or something
}

MyClass.prototype = {

    constructor: MyClass,

    init: function(){
        // …
    }

}


////////////////////////////////////////////////////////////////////////////////
// Usage

var myMyClass = new MyClass;

var something = { 'random object':true },
    somethingAsMyClass = MyClass(something); // same as MyClass.from(something)

Simple Module Pattern.example.js

function MyClass(){
    this.init()
}

MyClass.prototype = {

    constructor: MyClass,

    init: function(){
        // …
    }

}

////////////////////////////////////////////////////////////////////////////////
// Usage

var myMyClass = new MyClass;

// BEWARE!
MyClass() // throws 'undefined' is not a function (evaluating 'this.init()')
// That's because without `new`,
// the `this` in the MyClass constructor is the global object (usually window)
// and window.init() probably doesn't do what you expect.