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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
//Singleton classes
var mySingleton = (function(){
  var instance;
  var data;
  return{
    getInstance : function(){
      if(!instance){
        console.log("creating new instance");
        instance = this;
      }
      return instance;
    },
    setData : function( d){
      data = d;
    },
    getData: function(){
      return data;
    }
  }

})();

mySingleton.prototype.test = "my prototype test----";
var obj1 = mySingleton.getInstance();

var obj2 = mySingleton.getInstance();

 obj1.setData("this is object 1");
console.log(obj1.getData());
obj2.setData("this is object 2");
console.log("object 1 : ",obj1.getData());
console.log("object 2 : ",obj2.getData());
var obj3 = mySingleton.getInstance();
var obj4 = mySingleton.getInstance();
var obj5 = mySingleton.getInstance();
console.log("singleton : ", obj1 === obj2);

//non Singleton
console.log("########################################");
var myNonSingleton = function(){
  console.log("my non singleton class");
}
var obj6 = new myNonSingleton();
var obj7 = new myNonSingleton();
console.log("not singleton : ", obj6 === obj7);
</script>


<script id="jsbin-source-javascript" type="text/javascript">//Singleton classes
var mySingleton = (function(){
  var instance;
  var data;
  return{
    getInstance : function(){
      if(!instance){
        console.log("creating new instance");
        instance = this;
      }
      return instance;
    },
    setData : function( d){
      data = d;
    },
    getData: function(){
      return data;
    }
  }

})();

mySingleton.prototype.test = "my prototype test----";
var obj1 = mySingleton.getInstance();

var obj2 = mySingleton.getInstance();

 obj1.setData("this is object 1");
console.log(obj1.getData());
obj2.setData("this is object 2");
console.log("object 1 : ",obj1.getData());
console.log("object 2 : ",obj2.getData());
var obj3 = mySingleton.getInstance();
var obj4 = mySingleton.getInstance();
var obj5 = mySingleton.getInstance();
console.log("singleton : ", obj1 === obj2);

//non Singleton
console.log("########################################");
var myNonSingleton = function(){
  console.log("my non singleton class");
}
var obj6 = new myNonSingleton();
var obj7 = new myNonSingleton();
console.log("not singleton : ", obj6 === obj7);</script></body>
</html>