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Postings from January 2011
On Wed, Jan 26, 2011 at 04:19:12PM +0000, Ed Avis wrote:
> Abigail <abigail <at> abigail.be> writes:
>
> >> % perl -E '@a = ("1"); say "1 x" ~~ @a'
> >>
> >> % perl -E '@a = (1); say "1 x" ~~ @a'
> >> 1
>
> >>This is the only place in everyday Perl programming where the difference is
> >>noticeable.
> >
> >False, unfortunally.
> >
> > $ perl -wE 'say 10 | 33'
> > 43
>
> Ah - I do not use the | operator in everyday programming (in fact, I don't think
> I have ever used it) so I didn't think of this case.
Never did something like
flock $fh, LOCK_EX | LOCK_UN;
sysopen $fh, "foo", 0666, O_CREAT | O_EXCL;
if ($? & 127) {say "Coredump"}
?
>
> >And it can even be more subtle:
> >
> > $ perl -E '$a = $b = "abc100"; 0 + $b; say $a; say $b;
> > $a ++; $b ++; say $a; say $b'
>
> That is a nasty one. Surely the expression 0 + $b should not mutate the value
> of $b. I'm surprised this is not considered a bug?
I'm pretty sure I'd like $b to get a numerical value if I use it in
numeric context.
Abigail
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