Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr - Use 4-argument substr instead of writing substr($foo, 2, 6) = $bar.
substr
substr($foo, 2, 6) = $bar
This Policy is part of the core Perl::Critic distribution.
Conway discourages the use of substr() as an lvalue, instead recommending that the 4-argument version of substr() be used instead.
substr()
substr($something, 1, 2) = $newvalue; # not ok substr($something, 1, 2, $newvalue); # ok
The four-argument form of substr() was introduced in Perl 5.005. This policy does not report violations on code which explicitly specifies an earlier version of Perl (e.g. use 5.004;).
use 5.004;
This Policy is not configurable except for the standard options.
"substr" in perlfunc (or perldoc -f substr).
perldoc -f substr
"4th argument to substr" in perl5005delta
Graham TerMarsch <graham@howlingfrog.com>
Copyright (c) 2005-2011 Graham TerMarsch. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
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cpanm
cpanm Perl::Critic
CPAN shell
perl -MCPAN -e shell install Perl::Critic
For more information on module installation, please visit the detailed CPAN module installation guide.