Claude Pache wrote:
> Personally, I use the following expression in order to coerce a variable to a string:
>
> 	var obj = this + ''
>
> and its in-place variant:
>
> 	x += ''
>
> I think it'll continue to work in ES6.

Agreed, this is the correct-and-most-concise way to do it. It should 
throw on symbols, that's important.

Having String(sym) not throw is a win for other reasons Arv identified, 
but using String(any) to invoke ToString is verbose and fragile, because 
String could be rebound :-P. Use +'' if you want ToString in the 
language, I say.

/be

Agreed, this is the correct-and-most-concise way to do it. It should 
throw on symbols, that's important.

Having `String(sym)` not throw is a win for other reasons Arv identified, 
but using `String(any)` to invoke ToString is verbose and fragile, because 
String could be rebound :-P. Use `+''` if you want ToString in the 
language, I say.