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Re: upcoming changes in Lua 5.2

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On Tue, Feb 26, 2008 at 5:23 PM, Alex Davies <alex.mania@iinet.net.au> wrote:
> From: "Alexander Gladysh"
>
> > Continue contradicts with my understanding of single exit point idiom.
>
> I don't think single exit point theorem has any place in a language that has
> both a "return" statement and allows multiple returns. At least not to be
> followed religiously, or it'd lead to some terribly inefficient code.
Of course! I myself write a function in a month which does not follow
this rule. :)
It is just a programming habit which I like follow, and which makes
code cleaner for *my* eyes.
> Remembering that no programmer will be forced to use continue, I don't
> really see any negatives. Besides of course that it'll be hard to remove
> from the language at a later date, should it prove incompatible with some
> new syntax ;) (eg, the repeat until scope rule). Although it's rarely
> needed, the few times where is it currently require a complete code
> restructure, and possibly temporary state variables that would otherwise
> uneeded. Plus most people take it for granted that the language will support
> it. My vote goes for keep repeat untils, keep the repeat until scope, but
> throw an error if your continue jumps in to access of locals declared
> beneath it.
I agree.
Though, adding a continue would bring discussions about adding
continue N and break N (for exiting/continuing Nth nested loop above)
-- features for which I vigorously against. :)
Alexander.

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