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Postings from January 2011
On Wed, Jan 26, 2011 at 02:22:02PM +0000, Ed Avis wrote:
> Brad Baxter <bmb <at> mail.libs.uga.edu> writes:
>
> >>> perl -E '@a = ("1"); say "1 x" ~~ @a'
>
> >>This is a slightly unperlish distinction; usually in Perl it doesn't matter
> >>whether a scalar holds the number 42 or the string '42'
>
> >Perhaps I misunderstand the example, but there is no time that I'm aware
> >of when perl would store "1 x" in a scalar as a number.
>
> I was referring to this difference:
>
> % perl -E '@a = ("1"); say "1 x" ~~ @a'
>
> % perl -E '@a = (1); say "1 x" ~~ @a'
> 1
>
> So you have to be aware of the difference between 1 and '1'.
> This is the only place in everyday Perl programming where the difference is
> noticeable.
False, unfortunally.
$ perl -wE 'say 10 | 33'
43
$ perl -wE 'say "10" | "33"'
33
$
And it can even be more subtle:
$ perl -E '$a = $b = "abc100"; 0 + $b; say $a; say $b;
$a ++; $b ++; say $a; say $b'
abc100
abc100
abc101
1
$
Abigail
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