Prototype vs object.

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Returned object.
var Thing = function () {
  var privateVar = "";

  return {
     publicMethod: function () {
        return "thing";
     }
  }
};

var item = new Thing();
item.publicMethod();
ready
Prototype.
var Thing = function () {
   this.someVar = "";
};

Thing.prototype = {
   constructor: Thing,
   publicMethod: function () {
      return "thing";
   }
};

var item = new Thing();
item.publicMethod();
ready
Assignment in consturct
var Thing = function () {
   this.someVar = "";

   this.publicMethod = function () {
      return "thing";
   }
};

var item = new Thing();
item.publicMethod();
ready

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