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Perl::Critic::Policy::Freenode::LoopOnHash(3pm) User Contributed Perl Documentation Perl::Critic::Policy::Freenode::LoopOnHash(3pm)

NAME

Perl::Critic::Policy::Freenode::LoopOnHash - Don't loop over hashes

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. 

 foreach my $foo (%hash) { ... }      # not ok
 action() for %hash;                  # not ok
 foreach my $foo (keys %hash) { ... } # ok
 action() for values %hash;           # ok

If you intended to loop over alternating keys and values, you can make this intent clear by first copying them to an array:

 foreach my $key_or_value (@{[%hash]}) { ... }
 foreach my $key_or_value (my @dummy = %hash) { ... }

This policy is a subclass of the policy Perl::Critic::Policy::Variables::ProhibitLoopOnHash, and performs the same function but in the "freenode" theme.

AFFILIATION

This policy is part of Perl::Critic::Freenode.

CONFIGURATION

This policy is not configurable except for the standard options.

AUTHOR

Dan Book, "dbook@cpan.org"

COPYRIGHT AND LICENSE

Copyright 2015, Dan Book.

This library is free software; you may redistribute it and/or modify it under the terms of the Artistic License version 2.0.

SEE ALSO

Perl::Critic
2018-12-21 perl v5.28.1