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Re: using map and swap (aka substitute)

by AnomalousMonk (Canon)
on Jan 14, 2013 at 22:09 UTC ( #1013288=note: print w/replies, xml ) Need Help??

in reply to using map and swap (aka substitute)

With 5.14+, the  /r modifier can be used with  s/// substitution to achieve non-mutating substitution with return of a copy of the string (although the intermediate array creation by map noted by BrowserUk will, I think, still occur). See  s/// in the Regexp Quote-Like Operators section of perlop:

If the "/r" (non-destructive) option is used [in s///] then it runs the
substitution on a copy of the string and instead of returning
the number of substitutions, it returns the copy whether or not
a substitution occurred. The original string is never changed ...
>perl -wMstrict -le "my @list= qw(first_string second_string THIRD fourth_string); my @newlist = map s/_string$//r, @list; printf qq{'$_' } for @list; print ''; printf qq{'$_' } for @newlist; " 'first_string' 'second_string' 'THIRD' 'fourth_string' 'first' 'second' 'THIRD' 'fourth'

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[Lady_Aleena]: I don't want to have to do: alpha_menu($hash, undef, $type);
[Lady_Aleena]: Or what Discipulus said.
[shmem]: Lady_Aleena: geany supports ctags.
[Discipulus]: a good compromise can be my ($need, $opts_ref) = @_ a scalar and an hash reference
[Discipulus]: see you monks!
[Lady_Aleena]: shmem, let me get this sub rewritten, then I will look into how to use ctags in geany. Deal? 8)
[shmem]: Discipulus: yeah, that might eventually prepare the path for OO ;-)
[Lady_Aleena]: See you, Discipulus.
[shmem]: Lady_Aleena: that's up to you. I only wanted to show you a path that might be more comforting than command line grep ;-)
[Lady_Aleena]: shmem, I don't think any of my modules could be converted to OO. They are too procedural.

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