How to convert instance of any type to string?

Question

I'm implementing a function that receives an argument which it needs to convert to its string representation.

If a given object implements a toString() method, then the function should use it. Otherwise, the function can rely on what the JavaScript implementation offers.

What I come up with is like this:

var convert = function (arg) {   return (new String(arg)).valueOf(); } 

Answer 1

String(null) returns - "null"

String(undefined) returns - "undefined"

String(10) returns - "10"

String(1.3) returns - "1.3"

String(true) returns - "true"

I think this is a more elegent way.