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.IX Title "Perl::Critic::Policy::BuiltinFunctions::ProhibitComplexMappings 3pm"
.TH Perl::Critic::Policy::BuiltinFunctions::ProhibitComplexMappings 3pm "2018-07-27" "perl v5.26.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Perl::Critic::Policy::BuiltinFunctions::ProhibitComplexMappings \- Map blocks should have a single statement.
.SH "AFFILIATION"
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The map function can be confusing to novices in the best of
circumstances.  Mappings with multiple statements are even worse.
They're also a maintainer's nightmare because any added complexity
decreases readability precipitously.  Why?  Because map is
traditionally a one-liner converting one array to another.  Trying to
cram lots of functionality into a one-liner is a bad idea in general.
.PP
The best solutions to a complex mapping are: 1) write a subroutine
that performs the manipulation and call that from map; 2) rewrite the
map as a for loop.
.SH "CAVEATS"
.IX Header "CAVEATS"
This policy currently misses some compound statements inside of the
map.  For example, the following code incorrectly does not trigger a
violation:
.PP
.Vb 1
\&    map { do { foo(); bar() } } @list
.Ve
.SH "CONFIGURATION"
.IX Header "CONFIGURATION"
By default this policy flags any mappings with more than one
statement.  While we do not recommend it, you can increase this limit
as follows in a \fI.perlcriticrc\fR file:
.PP
.Vb 2
\&    [BuiltinFunctions::ProhibitComplexMappings]
\&    max_statements = 2
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Chris Dolan <cdolan@cpan.org>
.SH "CREDITS"
.IX Header "CREDITS"
Initial development of this policy was supported by a grant from the
Perl Foundation.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c) 2007\-2011 Chris Dolan.
.PP
This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.