[Info-vax] [OT] The wonders of Javascript...

[hb]

On 03/01/2015 06:37 PM, Simon Clubley wrote:
> There's a number of stupid design issues in there which are
> consistant with what I have come across, but even so, number + undefined
> variable = NaN (instead of syntax error) is a new low.:-)
>
> This is in the Firefox Javascript interpreter, so I don't know if this
> behaviour is specific to that interpreter.

For what it is worth, with a simplified example, iceweasel (32.0.3) and 
chrome (37.0.2062.120) report a "ReferenceError: xxx is not defined" or 
"Uncaught ReferenceError: xxx is not defined" in the "console log" each 
pointing to the source line.

I don't have Firefox on the system I'm currently logged in, but I expect 
it to show something similar in that log. And from experience I know 
that Firefox displays an error count, in my configuration at the bottom 
of the window, which is "clickable" and transfers me to the console log.

On the other hand, is there really a "syntax error"?

PS: Regardless whether I like Javascript or not, I use or have to use it 
to run some code on the client side of a web application. Or is there 
something else to check user input before/without transmitting it over 
the net?