Question

If I return some value or object in constructor function, what will the var get?

function MyConstroctor()
{
    //what in case when return 5;
    //what in case when return someObject;
}

var n = new MyConstroctor();

what n will get in both cases?

Actually its a quiz question, what will be the answer?
What is returned from a custom object constructor?
a)The newly-instantiated object
b)undefined – constructors do not return values
c)Whatever is the return statement
d)Whatever is the return statement; the newly-instantiated object if no return statement

Answer 1

I found this great link:

JavaScript: Constructor Return Value

The second piece of magic eluded to above is the ability for a
constructor to return a specific, possibly pre-existing object, rather
than a reference to a new instance. This would allow you to manage the
number of actual instances yourself if needed; possibly for reasons of
limited resources or whatnot.

var g_deebee = new Deebee();
function Deebee() { return g_deebee; }
var db1 = new Deebee();
var db2 = new Deebee();
if (db1 != db2)
  throw Error("JS constructor returned wrong object!");
else console.log('Equal');