devel::dwarn(3) [mojave man page]

Devel::Dwarn(3) 					User Contributed Perl Documentation					   Devel::Dwarn(3)

NAME

       Devel::Dwarn - return Dwarn @return_value

SYNOPSIS

	 use Devel::Dwarn;

	 return Dwarn some_call(...)

       is equivalent to:

	 use Data::Dumper::Concise;

	 if (wantarray) {
	    my @return = some_call(...);
	    warn Dumper(@return);
	    return @return;
	 } else {
	    my $return = some_call(...);
	    warn Dumper($return);
	    return $return;
	 }

       but shorter. If you need to force scalar context on the value,

	 use Devel::Dwarn;

	 return DwarnS some_call(...)

       is equivalent to:

	 use Data::Dumper::Concise;

	 my $return = some_call(...);
	 warn Dumper($return);
	 return $return;

       If you need to force list context on the value,

	 use Devel::Dwarn;

	 return DwarnL some_call(...)

       is equivalent to:

	 use Data::Dumper::Concise;

	 my @return = some_call(...);
	 warn Dumper(@return);
	 return @return;

       If you want to label your output, try DwarnN

	 use Devel::Dwarn;

	 return DwarnN $foo

       is equivalent to:

	 use Data::Dumper::Concise;

	 my @return = some_call(...);
	 warn '$foo => ' . Dumper(@return);
	 return @return;

       If you want to output a reference returned by a method easily, try $Dwarn

	$foo->bar->{baz}->$Dwarn

       is equivalent to:

	 my $return = $foo->bar->{baz};
	 warn Dumper($return);
	 return $return;

       If you want to immediately die after outputting the data structure, every Dwarn subroutine has a paired Ddie version, so just replace the
       warn with die.  For example:

	DdieL 'foo', { bar => 'baz' };

TIPS AND TRICKS

   global usage
       Instead of always just doing:

	 use Devel::Dwarn;

	 Dwarn ...

       We tend to do:

	 perl -MDevel::Dwarn foo.pl

       (and then in the perl code:)

	 ::Dwarn ...

       That way, if you leave them in and run without the "use Devel::Dwarn" the program will fail to compile and you are less likely to check it
       in by accident.	Furthmore it allows that much less friction to add debug messages.

   method chaining
       One trick which is useful when doing method chaining is the following:

	 my $foo = Bar->new;
	 $foo->bar->baz->Devel::Dwarn::DwarnS->biff;

       which is the same as:

	 my $foo = Bar->new;
	 (DwarnS $foo->bar->baz)->biff;

SEE ALSO

       This module is really just a shortcut for Data::Dumper::Concise::Sugar, check it out for more complete documentation.

perl v5.18.2							    2013-12-31							   Devel::Dwarn(3)

Data::Dumper::Concise::Sugar(3) 			User Contributed Perl Documentation			   Data::Dumper::Concise::Sugar(3)

NAME

       Data::Dumper::Concise::Sugar - return Dwarn @return_value

SYNOPSIS

	 use Data::Dumper::Concise::Sugar;

	 return Dwarn some_call(...)

       is equivalent to:

	 use Data::Dumper::Concise;

	 if (wantarray) {
	    my @return = some_call(...);
	    warn Dumper(@return);
	    return @return;
	 } else {
	    my $return = some_call(...);
	    warn Dumper($return);
	    return $return;
	 }

       but shorter. If you need to force scalar context on the value,

	 use Data::Dumper::Concise::Sugar;

	 return DwarnS some_call(...)

       is equivalent to:

	 use Data::Dumper::Concise;

	 my $return = some_call(...);
	 warn Dumper($return);
	 return $return;

       If you need to force list context on the value,

	 use Data::Dumper::Concise::Sugar;

	 return DwarnL some_call(...)

       is equivalent to:

	 use Data::Dumper::Concise;

	 my @return = some_call(...);
	 warn Dumper(@return);
	 return @return;

       If you want to label your output, try DwarnN

	 use Data::Dumper::Concise::Sugar;

	 return DwarnN $foo

       is equivalent to:

	 use Data::Dumper::Concise;

	 my @return = some_call(...);
	 warn '$foo => ' . Dumper(@return);
	 return @return;

       If you want to output a reference returned by a method easily, try $Dwarn

	$foo->bar->{baz}->$Dwarn

       is equivalent to:

	 my $return = $foo->bar->{baz};
	 warn Dumper($return);
	 return $return;

       If you want to format the output of your data structures, try DwarnF

	my ($a, $c) = DwarnF { "awesome: $_[0] not awesome: $_[1]" } $awesome, $cheesy;

       is equivalent to:

	 my @return = ($awesome, $cheesy);
	 warn DumperF { "awesome: $_[0] not awesome: $_[1]" } $awesome, $cheesy;
	 return @return;

       If you want to immediately die after outputting the data structure, every Dwarn subroutine has a paired Ddie version, so just replace the
       warn with die.  For example:

	DdieL 'foo', { bar => 'baz' };

DESCRIPTION

	 use Data::Dumper::Concise::Sugar;

       will import Dwarn, $Dwarn, DwarnL, DwarnN, and DwarnS into your namespace. Using Exporter, so see its docs for ways to make it do something
       else.

   Dwarn
	 sub Dwarn { return DwarnL(@_) if wantarray; DwarnS($_[0]) }

   $Dwarn
	 $Dwarn = &Dwarn

   $DwarnN
	 $DwarnN = &DwarnN

   DwarnL
	 sub Dwarn { warn Data::Dumper::Concise::Dumper @_; @_ }

   DwarnS
	 sub DwarnS ($) { warn Data::Dumper::Concise::Dumper $_[0]; $_[0] }

   DwarnN
	 sub DwarnN { warn '$argname => ' . Data::Dumper::Concise::Dumper $_[0]; $_[0] }

       Note: this requires Devel::ArgNames to be installed.

   DwarnF
	 sub DwarnF (&@) { my $c = shift; warn &Data::Dumper::Concise::DumperF($c, @_); @_ }

TIPS AND TRICKS

   global usage
       Instead of always just doing:

	 use Data::Dumper::Concise::Sugar;

	 Dwarn ...

       We tend to do:

	 perl -MData::Dumper::Concise::Sugar foo.pl

       (and then in the perl code:)

	 ::Dwarn ...

       That way, if you leave them in and run without the "use Data::Dumper::Concise::Sugar" the program will fail to compile and you are less
       likely to check it in by accident.  Furthmore it allows that much less friction to add debug messages.

   method chaining
       One trick which is useful when doing method chaining is the following:

	 my $foo = Bar->new;
	 $foo->bar->baz->Data::Dumper::Concise::Sugar::DwarnS->biff;

       which is the same as:

	 my $foo = Bar->new;
	 (DwarnS $foo->bar->baz)->biff;

SEE ALSO

       You probably want Devel::Dwarn, it's the shorter name for this module.

perl v5.18.2							    2013-12-31					   Data::Dumper::Concise::Sugar(3)