Javascript Design Patterns

Essential JavaScript Design Patterns For Beginners by Addy Osmani is a minibook published online.

Let me quote ‘Revealing Module Pattern’ code snippet which I find very neat.

/*
 The idea here is that you have private methods
 which you want to expose as public methods.

 What are are doing below is effectively defining
 a self-executing function and immediately returning
 the object.
 */
 var myRevealingModule = (function(){

    var name = 'John Smith';
    var age = 40;

    function updatePerson(){
      name = 'John Smith Updated';
    }
    function setPerson () {
       name = 'John Smith Set';
    }
    function getPerson () {
       return name;
    }
    return {
        set: setPerson,
        get: getPerson
    }
}());

// Sample usage:
myRevealingModule.get();

Compare it with module pattern.

var myNamespace = (function(){
	var myPrivateVar = 0;
		var myPrivateMethod = function(someText){
		console.log(someText);
	}
	
	return {
		myPublicVar: "foo",	
		myPublicFunction: function(bar){
			myPrivateVar++;
			myPrivateMethod(bar);
		}
	}
	
})();

I really enjoyed reading it. In addition to the design pattern article, you may like to read my articles on some javascript patterns:
Inheritance and Objects in Javascript
Inheritance, Closure, Module practice in Javascript
Functions in Javascript

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