What is the fastest and safest way to convert ANY type variable to String in JavaScript?

Question

Any thoughts on function that will receive one argument and returns back by string representation of the argument in JavaScript?

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

So what I come up with is like this.

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

Answer 1

value = value+"";

Answer 2

I'm not sure you even need a function, but this would be the shortest way:

function( arg ) {
    return arg + '';
}

Otherwise this is the shortest way:

arg += '';

Answer 3

All data types in JavaScript inherit a toString method:

('hello').toString();   // "hello"
(123).toString();       // "123"
([1,2,3]).toString();   // "1,2,3"
({a:1,b:2}).toString(); // "[object Object]"
(true).toString();      // "true"