Beefy Boxes and Bandwidth Generously Provided by pair Networks
Welcome to the Monastery
 
PerlMonks  

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'

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1013288]
help
Chatterbox?
[stevieb]: Corion: the problem with that is the 2.36 represents the underlying C library I've wrapped, which is why I want to use incrementals after the real version number. I've emailed modules@ to see if they can expedite the process for me...
[stevieb]: ...as normally, it takes three days to delete, in case you want to change your mind

How do I use this? | Other CB clients
Other Users?
Others lurking in the Monastery: (11)
As of 2017-01-19 15:09 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Do you watch meteor showers?




    Results (170 votes). Check out past polls.