NAME

       Perl::Critic::Policy::ValuesAndExpressions::ProhibitArrayAssignAref - don't assign an
       anonymous arrayref to an array

DESCRIPTION

       This policy is part of the "Perl::Critic::Pulp" add-on.  It asks you not to assign an
       anonymous arrayref to an array

           @array = [ 1, 2, 3 ];       # bad

       The idea is that it's rather unclear whether an arrayref is intended, or might have meant
       to be a list like

           @array = ( 1, 2, 3 );

       This policy is under the "bugs" theme (see "POLICY THEMES" in Perl::Critic) for the chance
       "[]" is a mistake, and since even if it's correct it will likely make anyone reading it
       wonder.

       A single arrayref can still be assigned to an array, but with parens to make it clear,

           @array = ( [1,2,3] );       # ok

       Dereferences or array and hash slices (see "Slices" in perldata) are recognised as an
       array target and treated similarly,

           @$ref = [1,2,3];            # bad assign to deref
           @{$ref} = [1,2,3];          # bad assign to deref
           @x[1,2,3] = ['a','b','c'];  # bad assign to array slice
           @x{'a','b'} = [1,2];        # bad assign to hash slice

   List Assignment Parens
       This policy is not a blanket requirement for "()" parens on array assignments.  It's
       normal and unambiguous to have a function call or "grep" etc without parens.

           @array = foo();                    # ok
           @array = grep {/\.txt$/} @array;   # ok

       The only likely problem from lack of parens in such cases is that the "," comma operator
       has lower precedence than "=" (see perlop), so something like

           @array = 1,2,3;   # oops, not a list

       means

           @array = (1);
           2;
           3;

       Normally the remaining literals in void context provoke a warning from Perl itself.

       An intentional single element assignment is quite common as a statement, for instance

           @ISA = 'My::Parent::Class';   # ok

       And for reference the range operator precedence is high enough,

           @array = 1..10;               # ok

       But of course parens are needed if concatenating some disjoint ranges with the comma
       operator,

           @array = (1..5, 10..15);      # parens needed

       The "qw" form gives a list too

           @array = qw(a b c);           # ok

SEE ALSO

       Perl::Critic, Perl::Critic::Pulp

HOME PAGE

       http://user42.tuxfamily.org/perl-critic-pulp/index.html

COPYRIGHT

       Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2019, 2021 Kevin Ryde

       Perl-Critic-Pulp is free software; you can redistribute it and/or modify it under the
       terms of the GNU General Public License as published by the Free Software Foundation;
       either version 3, or (at your option) any later version.

       Perl-Critic-Pulp is distributed in the hope that it will be useful, but WITHOUT ANY
       WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with Perl-Critic-
       Pulp.  If not, see <http://www.gnu.org/licenses>.

perl v5.32.1             Perl::Critic::Policy::ValuesAndExpressions::ProhibitArrayAssignAref(3pm)