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.IX Title "Perl::Critic::Policy::ValuesAndExpressions::ProhibitEmptyCommas 3pm"
.TH Perl::Critic::Policy::ValuesAndExpressions::ProhibitEmptyCommas 3pm "2021-02-28" "perl v5.32.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Perl::Critic::Policy::ValuesAndExpressions::ProhibitEmptyCommas \- disallow empty consecutive commas
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This policy is part of the \f(CW\*(C`Perl::Critic::Pulp\*(C'\fR
add-on.  It prohibits empty comma operators \f(CW\*(C`,\*(C'\fR or \f(CW\*(C`=>\*(C'\fR meaning either
consecutive commas or a comma at the start of a list or expression.
.PP
.Vb 6
\&    print \*(Aqfoo\*(Aq,,\*(Aqbar\*(Aq;      # bad
\&    @a = (,1,2);             # bad
\&    foo (x, => 123);         # bad
\&    a =>=> 456;              # bad
\&    for (; $i++<10; $i++,,)  # bad
\&    func (,)                 # bad
.Ve
.PP
Extra commas like this are harmless and simply collapse out when the program
runs (see \*(L"List value constructors\*(R" in perldata), so this policy is only under
the \*(L"cosmetic\*(R" theme (see \*(L"\s-1POLICY THEMES\*(R"\s0 in Perl::Critic).  Usually this sort
of thing is just a stray, or leftover from cut and paste, or perhaps some
over-enthusiastic column layout.  Occasionally it can be something more
dubious,
.PP
.Vb 2
\&    # did you mean 1..6 range operator?
\&    @a = (1,,6);        # bad
\&
\&    # this is two args, did you want three?
\&    foo (1, , 2);       # bad
\&
\&    # this is three args, probably you forgot a value
\&    bar (abc => ,       # bad
\&         def => 20);
.Ve
.PP
A comma at the end of a list or call is allowed.  That's quite usual and can
be a good thing when cutting and pasting lines (see \f(CW\*(C`RequireTrailingCommas\*(C'\fR
to mandate them!).
.PP
.Vb 3
\&    @b = ("foo",
\&          "bar",  # ok
\&         );
.Ve
.PP
If you use multiple commas in some systematic way for code layout you can
always disable \f(CW\*(C`ProhibitEmptyCommas\*(C'\fR from your \fI.perlcriticrc\fR file in the
usual way (see \*(L"\s-1CONFIGURATION\*(R"\s0 in Perl::Critic),
.PP
.Vb 1
\&    [\-ValuesAndExpressions::ProhibitEmptyCommas]
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Perl::Critic::Pulp,
Perl::Critic,
Perl::Critic::Policy::CodeLayout::RequireTrailingCommas,
Perl::Critic::Policy::ValuesAndExpressions::ProhibitCommaSeparatedStatements,
Perl::Critic::Policy::Tics::ProhibitManyArrows
.SH "HOME PAGE"
.IX Header "HOME PAGE"
http://user42.tuxfamily.org/perl\-critic\-pulp/index.html
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2019, 2021 Kevin Ryde
.PP
Perl-Critic-Pulp is free software; you can redistribute it and/or modify it
under the terms of the \s-1GNU\s0 General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
.PP
Perl-Critic-Pulp is distributed in the hope that it will be useful, but
\&\s-1WITHOUT ANY WARRANTY\s0; without even the implied warranty of \s-1MERCHANTABILITY\s0
or \s-1FITNESS FOR A PARTICULAR PURPOSE.\s0  See the \s-1GNU\s0 General Public License for
more details.
.PP
You should have received a copy of the \s-1GNU\s0 General Public License along with
Perl-Critic-Pulp.  If not, see <http://www.gnu.org/licenses/>.