Javascript singleton pattern

Question

I don't know how to explain the issue I am facing. I had made a small snippet. Please check below:

var Package = {};

Object.defineProperty(Object.prototype, 'inherit',
    {
        value: function(Parent, args)
        {
            var temp = function(){};
            temp.prototype = Parent.prototype;
            this.prototype = new temp();
            this.uber = Parent.prototype;
            this.prototype.constructor = this;
        },
        enumerable: false
    });

var Module1 = Package.Module1 = function() {
  // code;
};
Module1.prototype.method1 = function() {
};


var Module2 = Package.Module2 = function() {
  // code;
};
Module2.prototype.method2 = function() {
};


var Module3 = Package.Module3 = function() {
  // code;
};
// using custom : object.prototype.inherit
// Module3 inherit Module1 and 2;
Module3.inherit(Module1);
Module3.inherit(Module2);
Module3.prototype.method3 = function() {
};

//creating object 
var mod = new Package.Module3();
mod.method1();
mod.method2();
mod.method3();

Creating the mod object I can access the method1,2 and 3. But actually I want to call the methods without creating the object, like Package.Module3.method1(); how is it possible?

Does Package.Module3 have to be a constructor function? You could just create it as an object and assign the functions to it. Or you assign an instance of Module3 to Package.Module3. It all depends on what else you want to do with it. — Felix Kling
– Felix Kling, Commented Jun 19, 2012 at 16:46
Singleton can be object literals in javascript. You don't have great an instance of the variable using new. More information here: blog.anselmbradford.com/2009/04/21/… — Larry Battle
– Larry Battle, Commented Jun 19, 2012 at 16:49
its not possible to add methods using prototype if we use.... : var method = new function() {}; — Jaison Justus
– Jaison Justus, Commented Jun 19, 2012 at 17:11

Joseph · Accepted Answer · 2012-06-19 17:09:32Z

5

Object literal notation?

var Package = {
    ModuleA : {
        methodA : function(){},
        methodB : function(){}
    },
    ModuleB : {
        methodC : function(){},
        methodD : function(){}
    }
}

Package.ModuleA.methodA();

edited Jun 19, 2012 at 17:09

answered Jun 19, 2012 at 16:48

Joseph

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2 Comments

Jaison Justus Over a year ago

but my inherit method wont work. the snippet iam using function inherit(C, P) { var F = function(){}; F.prototype = P.prototype; C.prototype = new F(); C.uber = P.prototype; C.prototype.constructor = C; }

Joseph Over a year ago

@JaisonJustus then create an external inherit function instead: method : ns.inheritFrom(someclass,someclass2...)

Engineer · Accepted Answer · 2012-06-19 16:57:38Z

1

Try something like this:

var Module3 = Package.Module3 = (function() {       
   var Module3 = function(){
       // using custom : object.prototype.inherit
       // Module3 inherit Module1 and 2;
   };
   Module3.inherit(Module1);
   Module3.inherit(Module2);
   Module3.prototype.method3 = function() {
   };
   return new Module3();
})();

In this case you have just one instance of Module3 class.

Usage:

Package.Module3.method1();
Package.Module3.method2();
Package.Module3.method3();

edited Jun 19, 2012 at 16:57

answered Jun 19, 2012 at 16:50

Engineer

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