!isNaN(value - 0)

Tal Liron tal.liron at threecrickets.com
Wed Mar 25 00:48:42 UTC 2015

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.

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