Javascript 'new' with function returning self-defined object [duplicate]

Question

Suppose I have the following function:

var A = function() {
   var label = "hello";
   return {
      getLabel: function() { return label; }
   }
};

Is there any difference between:

var a = A();

and

var a = new A();

?

NB: I'm not asking here what is the 'new' keyword in JavaScript, but how it behaves in this particular example.

Answer 1

In your particular instance, No, there is no difference.

Eitherw way, your function will return a self defined Object. By invoking a function with the new keyword, ECMAscript will automatically create a new object for you (alongside doing some magic with prototype and constructor properties), which you might access / write to via this within the function (-constructor).

Again, your return { } call in that function, will always return exactly that object reference.