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| author | Roderick Schertler <roderick@gate.net> | 1996-12-31 11:50:19 -0500 |
|---|---|---|
| committer | Chip Salzenberg <chip@atlantic.net> | 1997-01-01 08:59:00 +1200 |
| commit | c885792efecf3f527b3b5099727cc16b03eee1dc (patch) | |
| tree | 00936e0024876f90b41949aacc68b807975415a8 | |
| parent | a034a98d8bfd0fd904012bd5227ce209aaaa0b26 (diff) | |
| download | perl-c885792efecf3f527b3b5099727cc16b03eee1dc.tar.gz | |
Re: perldiag.pod entry for "Scalar value @%s{%s} ..."
On Mon, 30 Dec 1996 21:28:30 -0500, Gurusamy Sarathy <gsar@engin.umich.edu> said:
> On Mon, 30 Dec 1996 21:09:12 EST, Roderick Schertler wrote:
>>
>> +=item Scalar value @%s{%s} better written as $%s{%s}
>> +
>> +This is just like the previous entry, but for hashes instead of arrays.
>> +
>
> Won't that look odd under -Mdiagnostics? Better to spell it out
> again.
Right you are. This diff goes on top of the one above.
p5p-msgid: <2043.852051019@eeyore.ibcinc.com>
| -rw-r--r-- | pod/perldiag.pod | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/pod/perldiag.pod b/pod/perldiag.pod index 49d30fcab0..780aefc250 100644 --- a/pod/perldiag.pod +++ b/pod/perldiag.pod @@ -1815,7 +1815,7 @@ shifting or popping (for array variables). See L<perlform>. =item Scalar value @%s[%s] better written as $%s[%s] -(W) You've used an array slice (indicated by @) to select a single value of +(W) You've used an array slice (indicated by @) to select a single element of an array. Generally it's better to ask for a scalar value (indicated by $). The difference is that C<$foo[&bar]> always behaves like a scalar, both when assigning to it and when evaluating its argument, while C<@foo[&bar]> behaves @@ -1827,6 +1827,20 @@ element as a list, you need to look into how references work, because Perl will not magically convert between scalars and lists for you. See L<perlref>. +=item Scalar value @%s{%s} better written as $%s{%s} + +(W) You've used a slice (indicated by @) to select a single element of +a hash. Generally it's better to ask for a scalar value (indicated by $). +The difference is that C<$foo{&bar}> always behaves like a scalar, both when +assigning to it and when evaluating its argument, while C<@foo{&bar}> behaves +like a list when you assign to it, and provides a list context to its +subscript, which can do weird things if you're expecting only one subscript. + +On the other hand, if you were actually hoping to treat the hash +element as a list, you need to look into how references work, because +Perl will not magically convert between scalars and lists for you. See +L<perlref>. + =item Script is not setuid/setgid in suidperl (F) Oddly, the suidperl program was invoked on a script with its setuid |