Re: Thoughts on optional commas

[Jay Carlson <nop@...>]

On Mar 5, 2012, at 2:03 PM, Javier Guerra Giraldez wrote:

> On Mon, Mar 5, 2012 at 1:14 PM, Jay Carlson <nop@nop.com> wrote:
>>> In addition, the ability to add a trailing comma makes adding new items
>>> to the list and rearranging the order of the list items less of a hassle
>>> in Lua than in JavaScript.
>> 
>> I got screwed by expecting JavaScript to do the right thing. In C, it makes perfect sense to imply a trailing NULL entry. In languages that carry length with arrays, no.
> 
> i don't think that was about NULL termination, but that in some
> languages, the last element of a list or dictionary can have a
> trailing comma; but in JavaScript this is undefined.

> in most implementations this works as expected; but in IE it fails at runtime.

OK, I give up. Which stone-age C implementation taught me that

   char *foo[] = {
     "bar",
     "baz", /* <-- trailing comma */
   } 

could have length 3 and foo[2] == NULL? Anybody?