Question

Am I allowed to declare prototypes in an object literal?

var Obj = function(){
  var private = "Oh hi there I'm a private variable";
  return {
    init : function(param){
        this.param = 
        return this;
    }
    prototype.sayHi: function(){
        console.log("HI");
    }
  }
}

Would I now be able to call “Obj.sayHi”? Or is there a way to do this if the example is not possible?

Answer 1

You can use a local function to create the object with a prototype:

var Obj = function() {

    var private = "Oh hi there I'm a private variable";

    function create() {
        this.param = 42;
    }

    create.prototype = {

        sayHi: function() {
            console.log(private + this.param);
        }

    };

    return new create();

};

var x = Obj();
x.sayHi();

Demo: http://jsfiddle.net/Guffa/pZQnU/