perl::critic::policy::subroutines::prohibitreturnsort(3) [centos man page]
Perl::Critic::Policy::Subroutines::ProhibitReturnSort(3)User Contributed Perl DocumentatioPerl::Critic::Policy::Subroutines::ProhibitReturnSort(3)NAME
Perl::Critic::Policy::Subroutines::ProhibitReturnSort - Behavior of "sort" is not defined if called in scalar context.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
The behavior of the builtin "sort" function is not defined if called in scalar context. So if you write a subroutine that directly
"return"s the result of a "sort" operation, then you code will behave unpredictably if someone calls your subroutine in a scalar context.
This Policy emits a violation if the "return" keyword is directly followed by the "sort" function. To safely return a sorted list of
values from a subroutine, you should assign the sorted values to a temporary variable first. For example:
sub frobulate {
return sort @list; # not ok!
@sorted_list = sort @list;
return @sort # ok
}
KNOWN BUGS
This Policy is not sensitive to the "wantarray" function. So the following code would generate a false violation:
sub frobulate {
if (wantarray) {
return sort @list;
}
else{
return join @list;
}
}
CONFIGURATION
This Policy is not configurable except for the standard options.
CREDITS
This Policy was suggested by Ulrich Wisser and the <http://iis.se> team.
AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license
can be found in the LICENSE file included with this module.
perl v5.16.3 2014-06-09 Perl::Critic::Policy::Subroutines::ProhibitReturnSort(3)
Check Out this Related Man Page
Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidMap(User Contributed Perl DocumentPerl::Critic::Policy::BuiltinFunctions::ProhibitVoidMap(3pm)NAME
Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidMap - Don't use "map" in void contexts.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
"map" and "grep" are intended to be pure functions, not mutators. If you want to iterate with side-effects, then you should use a proper
"for" or "foreach" loop.
grep{ print frobulate($_) } @list; #not ok
print map{ frobulate($_) } @list; #ok
grep{ $_ = lc $_ } @list; #not ok
for( @list ){ $_ = lc $_ }; #ok
map{ push @frobbed, frobulate($_) } @list; #not ok
@frobbed = map { frobulate($_) } @list; #ok
CONFIGURATION
This Policy is not configurable except for the standard options.
AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license
can be found in the LICENSE file included with this module.
perl v5.14.2 2012-06-07 Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidMap(3pm)
Hello,
How would I sort a file in reverse,?
In other words, my file has that the date for example as :
bob 25years.
I would like it sorted this way :
25years bob.
I did a man on sort but nothing really that helps.
Thanks. (4 Replies)
I am using the command below to sort unique a file and I keep getting this error that sort can't stat.
Error:
sort: can't stat /xxxx/xxxxx/2005/xxxxxx/out_20050602155231/test.txt: No such file or directory
Does anybody have an idea when this error could occur.
Thanks,
Radhika.
if ... (5 Replies)
Looking at the member list, there are alot of interesting names, some unique, some bizarre, and some that are just plain. How did you come by your name? Why did you choose your label?
Me? Well, I wish I could change mine. I chose Google because thats how I stumbled upon this site. I wasn't sure... (66 Replies)
Hi,
Can any one please let me know the code for implementing
who | sort | lp
Basically I want to implent pipe here. The program can use the existing who, sort and lp
Also please let me know How many processes are created in Unix when the following commands are executed?
$ ls... (17 Replies)
I've done a quick Google about this, but could not find the answer I want.
Say, there is an array like this:
@A = qw(cd1 a1 ef a2 hij a12 b2 b4 b22);
I want to sort the array in the first order:
@sorted = qw(a1 a12 a2 b2 b22 b4 cd1 ef hij);
And second order:
@sorted = qw(a1 a2 a12 b2 b4... (5 Replies)
Hi,
I am new to PERL.I want to sort all the lines in a file based on 1,2 and 4th filelds.
Can U suggest me a command/function in perl for this operation.. (5 Replies)
Hi
Is there any way I could reproduce the following code in perl 5.8:
sort -u FILE | sort -t: -k1,1 -k2n
which sorts by unicity first, then by first key, then by second key in numeric format.
What I have now is
@sort_array=uniq sort @sort_array;
after the contents of my... (5 Replies)
Im trying to sort all this data.
I need to get a list out of the data (websites) and just list them out can anyone point me in the right direction. Im working with dans guardian.
2009.6.10 6:26:50 - 192.168.42.200... (5 Replies)
HI all
i have a text file file1 like this
004002004545454000001
041002004545222000002
006003008751525000003
007003008751352000004
006003008751142000005
004001005745745000006
i want to sort the file according to position 1-5 and secondary sort by
the last position of file 16-21... (4 Replies)
I have, a file wich list file on server ftp and i want to sort the file text as the command "ls -t"
i.e
drwxr-x--- 2 ftp_mont System 0 Sep 30 09:16 .
drwxr-x--- 2 ftp_mont System 0 Jul 15 2009 ..
-rwxr-x--- 1 ftp_mont System 343998791 Sep 01 09:20 manif... (14 Replies)
Hello,
I'm trying to sort a file which has many lines with the sort command.
I'd like to send the sorted content in the same file.
But when I do that, I've the content which is sorted, but all is on one line... I view the content in Notepad++
Could somebody help me to keep the original... (5 Replies)
Good morning,
I am 100% mew to Unix and am trying to troubleshoot why a pgm written 3 years ago, suddenly is not working properly. It is part Perl with some UNIX commands thrown in. I need to verify what the UNIX commands are doing before I can continue with my other troubleshooting.
print... (7 Replies)
i'd like someone to explain me the meaning of the code below:
sort -t: +0 -1 /etc/passwd
when i'm running this at terminal it prints me all the contents of /etc/passwd file.
maybe it sorts them by the first collumn? (4 Replies)
hi,
would you guys help me ?
i have a file with some list, and i want to sort the list and get last value.
ex: cat testing.csv
$ cat testing.csv
a,1
a,2
a,3
d,5
b,3
c,3
c,4
etc
i want to get value like this :
a,3
b,3 (5 Replies)