!isNaN(value - 0)

[Tal Liron]

Hm, actually, something weirder is going on:

isNaN('1.5x') -> true
isNaN('1.5d') -> false

What is it about "d"? Is it some kind of numerical literal? Again, this 
is not standard behavior for JavaScript.

On 03/24/2015 07:40 PM, Tal Liron wrote:
> In most JavaScript engines, this would return true if value is fully 
> numerical:
>
> !isNaN(value - 0)
>
> But in Nashorn, it returns true if even if value is a string that 
> begins with a number. It seems that arithmetic with strings is working 
> non-standardly in Nashorn.