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.IX Title "Perl::Critic::Policy::Freenode::LoopOnHash 3pm"
.TH Perl::Critic::Policy::Freenode::LoopOnHash 3pm "2020-12-26" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Perl::Critic::Policy::Freenode::LoopOnHash \- Don't loop over hashes
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
It's possible to loop over a hash as if it was a list, which results in
alternating between the keys and values of the hash. Often, the intent was
instead to loop over either the keys or the values of the hash.
.PP
.Vb 4
\& foreach my $foo (%hash) { ... }      # not ok
\& action() for %hash;                  # not ok
\& foreach my $foo (keys %hash) { ... } # ok
\& action() for values %hash;           # ok
.Ve
.PP
If you intended to loop over alternating keys and values, you can make this
intent clear by first copying them to an array:
.PP
.Vb 2
\& foreach my $key_or_value (@{[%hash]}) { ... }
\& foreach my $key_or_value (my @dummy = %hash) { ... }
.Ve
.PP
This policy is a subclass of the policy
Perl::Critic::Policy::Variables::ProhibitLoopOnHash, and performs the same
function but in the \f(CW\*(C`freenode\*(C'\fR theme.
.SH "AFFILIATION"
.IX Header "AFFILIATION"
This policy is part of Perl::Critic::Freenode.
.SH "CONFIGURATION"
.IX Header "CONFIGURATION"
This policy is not configurable except for the standard options.
.SH "AUTHOR"
.IX Header "AUTHOR"
Dan Book, \f(CW\*(C`dbook@cpan.org\*(C'\fR
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2015, Dan Book.
.PP
This library is free software; you may redistribute it and/or modify it under
the terms of the Artistic License version 2.0.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Perl::Critic