On Sun, 24 Jan 2016 20:03:29 +0100 Paul Johnson <p...@pjcj.net> wrote:
> On Sun, Jan 24, 2016 at 05:44:14PM +0200, Shlomi Fish wrote: > > Hi lee, > > > > On Sun, 24 Jan 2016 13:11:37 +0100 > > lee <l...@yagibdah.de> wrote: > > > > > Paul Johnson <p...@pjcj.net> writes: > > > > > > > > In scalar context the comma operator evaluates its left-hand side, > > > > throws it away and returns the right-hand side. > > > > > > What is the useful use for this operator? > > > > > > > Well, I believe its use was originally inherited from > > https://en.wikipedia.org/wiki/C_%28programming_language%29 where one can do > > something like: > > > > x = (y++, y+2); > > > > In Perl 5 though it is preferable to use do { ... } instead: > > > > $x = do { $y++; $y+2; }; > > In both Perl and C the comma operator is probably most usually (deliberately) > seen in for statements: > Good point, Paul! I forgot about it. -- Shlomi -- ----------------------------------------------------------------- Shlomi Fish http://www.shlomifish.org/ Rethinking CPAN - http://shlom.in/rethinking-cpan Sisko: Q: would it be OK if my crew brought along their phasers with them? Q: Of course. They can also bring some photon torpedoes if they wish. None of them will work, but I don’t mind them taking them. Please reply to list if it's a mailing list post - http://shlom.in/reply . -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
