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.IX Title "Perl::Critic::Policy::Variables::RequireInitializationForLocalVars 3pm"
.TH Perl::Critic::Policy::Variables::RequireInitializationForLocalVars 3pm "2020-05-17" "perl v5.30.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Perl::Critic::Policy::Variables::RequireInitializationForLocalVars \- Write "local $foo = $bar;" instead of just "local $foo;".
.SH "AFFILIATION"
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Most people don't realize that a localized copy of a variable does not
retain its original value.  Unless you initialize the variable when
you \f(CW\*(C`local\*(C'\fR\-ize it, it defaults to \f(CW\*(C`undef\*(C'\fR.  If you want the
variable to retain its original value, just initialize it to itself.
If you really do want the localized copy to be undef, then make it
explicit.
.PP
.Vb 2
\&    package Foo;
\&    $Bar = \*(Aq42\*(Aq;
\&
\&    package Baz;
\&
\&    sub frobulate {
\&
\&        local $Foo::Bar;              #not ok, local $Foo::Bar is \*(Aqundef\*(Aq
\&        local $Foo::Bar = undef;      #ok, local $Foo::Bar is obviously \*(Aqundef\*(Aq
\&        local $Foo::Bar = $Foo::Bar;  #ok, local $Foo::Bar still equals \*(Aq42\*(Aq
\&
\&    }
.Ve
.SH "CONFIGURATION"
.IX Header "CONFIGURATION"
This Policy is not configurable except for the standard options.
.SH "AUTHOR"
.IX Header "AUTHOR"
Jeffrey Ryan Thalhammer <jeff@imaginative\-software.com>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c) 2005\-2011 Imaginative Software Systems.  All rights reserved.
.PP
This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.  The full text of this license
can be found in the \s-1LICENSE\s0 file included with this module.