Example 2

example2.js

(function(){ //opens the closure
 
	//utility function
	function extractCode(obj){
		return obj.code;
	};
 
	//definition of private object Animal
	var Animal= function(){
		this.name="";
	};
	
	Animal.prototype={
		getAnimal : function(code){
			if(code=="c"){
				this.name="Cat";
			}
                        else if(code=="d"){
				this.name="Dog";
			}
			else{
				this.name="unknown";
			}
 
		}
	};
 
 
	//myLib public interface
	window.myLib = {
		selectAnimal : function(params){
			var selector=new  Animal();
			var code = extractCode(params);
			selector.getAnimal(code);
			return selector.name;
		}
        };
 
})(); //closes the closure
 
//Call selectAnimal publicly with JSON data
window.myLib.selectAnimal({"code":"d"});