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Postings from January 2011
On Tue, Jan 25, 2011 at 12:08 PM, Ed Avis <eda@waniasset.com> wrote:
> This question is about the smart match operator ~~ and about its documentation.
> Is it possible to find whether an array contains a given string?
>
> In perl 5.10.0 I was using
>
> @a ~~ $x
>
> but from a glance at perlsyn(1) it appears that this does something different in
> 5.10.1 and later. I am not posting to complain about that change - it was well
> signposted that smart matching in 5.10.0 was an experimental feature - but I
> suggest an explicit entry in the 'Smart matching in detail' section to document
> the case when $a is an array and $b is a string, which is currently missing.
>
> From the new perlsyn it looks like 'match against an array element' might be
> what I want to use, as
>
> $x ~~ @a
>
> but this has some surprising behaviour:
>
> % perl -E '@a = (1); say "1 x" ~~ @a'
> 1
>
> That is a consequence of this:
>
> % perl -E 'say "1 x" ~~ 1'
> 1
>
> which is documented in the 'Any / Num' case in perlsyn (and gives a warning
> with -w). But is there any way to get a plain string match, at least for
> scalars which are not references?
>
> If not, I could instead use
>
> List::MoreUtils::any { $_ eq $x } @a
Actually, all you would have to do is make sure that the elements of
the array are strings.
perl -E '@a = ("1"); say "1 x" ~~ @a'
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