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Full Discussion: Perl combine multiple map statements
Top Forums Shell Programming and Scripting Perl combine multiple map statements Post 302912033 by durden_tyler on Tuesday 5th of August 2014 10:16:00 AM
Old 08-05-2014
Quote:
Originally Posted by sam05121988
...For this I am reading the file line bye line in an array and using multiple map statements for substitution, as below
Code:
@files = map { $_ =~ s/\.$/\.$TODAY/g; $_ } @files;
@files = map { $_ =~ s/TODAY/$TODAY/g; $_ } @files;
@files = map { $_ =~ s/THISYEAR/$THISYEAR/g; $_ } @files;
@files = map { $_ =~ s/LASTYEAR/$LASTYEAR/g; $_ } @files;

can anyone suggest how can I combine these multiple map statements in one
...
Code:
$
$ perl -le '@files = qw (file. file.TODAY.THISYEAR file.TODAY.LASTYEAR);
            $TODAY = "140805"; $THISYEAR = "2014"; $LASTYEAR = "2013";  # should not be hard-coded
            foreach $i (@files) { print $i }
            @new_files = map { $_ =~ s/\.$/.$TODAY/;
                               $_ =~ s/\.TODAY\.THISYEAR/.$TODAY.$THISYEAR/;
                               $_ =~ s/\.TODAY\.LASTYEAR/.$TODAY.$LASTYEAR/; $_
                             } @files;
            print "==========================";
            foreach $i (@new_files) { print $i }
           '
file.
file.TODAY.THISYEAR
file.TODAY.LASTYEAR
==========================
file.140805
file.140805.2014
file.140805.2013
 
$
$

This User Gave Thanks to durden_tyler For This Post:
sam05121988
 

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LEARN ABOUT DEBIAN

perl::critic::policy::builtinfunctions::prohibitcomplexmappings

Perl::Critic::Policy::BuiltinFunctions::ProhibitComplexMUsernContributed Perl Perl::Critic::Policy::BuiltinFunctions::ProhibitComplexMappings(3pm)

NAME

       Perl::Critic::Policy::BuiltinFunctions::ProhibitComplexMappings - Map blocks should have a single statement.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       The map function can be confusing to novices in the best of circumstances.  Mappings with multiple statements are even worse.  They're also
       a maintainer's nightmare because any added complexity decreases readability precipitously.  Why?  Because map is traditionally a one-liner
       converting one array to another.  Trying to cram lots of functionality into a one-liner is a bad idea in general.

       The best solutions to a complex mapping are: 1) write a subroutine that performs the manipulation and call that from map; 2) rewrite the
       map as a for loop.

CAVEATS

       This policy currently misses some compound statements inside of the map.  For example, the following code incorrectly does not trigger a
       violation:

	   map { do { foo(); bar() } } @list

CONFIGURATION

       By default this policy flags any mappings with more than one statement.	While we do not recommend it, you can increase this limit as
       follows in a .perlcriticrc file:

	   [BuiltinFunctions::ProhibitComplexMappings]
	   max_statements = 2

AUTHOR

       Chris Dolan <cdolan@cpan.org>

CREDITS

       Initial development of this policy was supported by a grant from the Perl Foundation.

COPYRIGHT

       Copyright (c) 2007-2011 Chris Dolan.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2012-06-07Perl::Critic::Policy::BuiltinFunctions::ProhibitComplexMappings(3pm)
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