Re: Perl::Critic says don't modify $_ in list functions and other things

Sometimes, no loop is needed at all:

chomp( my @list = <$fh> );
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When using readline, it's probably not so serious, as you aren't changing the original array in place at the same time.

The /r is useful when you want to keep the original:

my @ids = map s/ /_/gr, 
          grep defined,
          @base;
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When you want to modify the original array, use "for" instead.

for (@$list) {
    if (ref) {
        ...
    } else {
        $_ = ...;
    }
}
[download]

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

Comment on Re: Perl::Critic says don't modify $_ in list functions and other things Select or Download Code

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Re^2: Perl::Critic says don't modify $_ in list functions and other things by hippo (Bishop) on Jul 09, 2020 at 08:33 UTC
The /r is useful when you want to keep the original It is indeed useful and thanks for mentioning it (++). For some reason the fact that it exists never seems to stick with me! However, in Lady_Aleena's case it might not be an option because her sig says my perl versions are 5.28.1 local and 5.8.8 on web host. and /r only came in at 5.13.2 (according to perlver). As an even further aside it's a bit surprising to find anyone offering 5.8.8 as part of a service today. I am not aware of any O/S still shipping that as standard.	[reply]
Re^3: Perl::Critic says don't modify $_ in list functions and other things by Bod (Parson) on Nov 19, 2020 at 17:38 UTC
As an even further aside it's a bit surprising to find anyone offering 5.8.8 as part of a service today. I am not aware of any O/S still shipping that as standard. That's what I was thinking... I'm considering upgrading from shared hosting to VPS purely so I can upgrade from 5.16.003 to something a bit more modern. Being stuck with 5.8.8 seems a bit dire.	[reply]
Re^4: Perl::Critic says don't modify $_ in list functions and other things by marto (Cardinal) on Nov 19, 2020 at 17:52 UTC
Your own VPS is so cheap these days, and allows the freedom to leave the past where it belongs. I'm sure you'll only have a positive experience moving forwards with this.	[reply]
Re^5: Perl::Critic says don't modify $_ in list functions and other things by Bod (Parson) on Nov 19, 2020 at 17:56 UTC


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