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coprolit on 03/17/11

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Last Edited at 03/17/11 08:40am

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Javascript revealing module pattern template

/ Published in: JavaScript

"Javascript module pattern emulates the concept of classes in such a way that we're able to include both public/private methods and variables inside a single object, thus shielding/namespacing particular parts from the global scope."
When inheritance is not needed and a only few instances is needed (Keep in mind that each instance places a new copy of each function in memory!)

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/*
 The idea here is that you have private methods
 which you want to expose as public methods.
*/
 
var SomeModule = (function(param){
	// Private stuff
	// 'this' keyword refers to the current instance. Must use 'new' when creating instances of the module, else 'this' will refer to global scope.
	this.initval = param;
	this.name = 'John Smith';
	this.age = 40;
 
	function setPerson(param) {
		this.name = param;
	}
 
	function getPerson() {
		return this.name; // create closure (inner function) to bind the var (= keep it around)
	}
	// Public stuff / reveal and bind
	return {
		set: this.setPerson,
		get: this.getPerson,
		age: this.age
	};
});
 
// creating instances
var newModule = new SomeModule(newparam);
newModule.set("Some Name");
var name = newModule.age;
var name = newModule.get;