Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

A few minor changes I like:

  • Using a hash instead an array of code refs allows to give names to the transformations.
  • A bit of error checking can be added, unknown transformations can be ignored and warned about.
  • Instead of passing the indices into the closure, it is more efficient to pass the code references into it. This will generate no additional overhead from the niceties added to the generator function.
It could look like this:

use strict; use warnings; sub fgenerator { my %f = ( add_one => sub {map {$_ + 1} @_}, log => sub {map {log($_)} @_}, times_3 => sub {map {$_ * 3} @_}, ); my @t = @f{ grep { exists $f{$_} } @_ }; # ignore unknown name +s warn "Don't know sub(s) ".join ", ",(grep { !exists $f{$_} } @ +_) if @t < @_; return sub { @_ = $_->(@_) for @t; return @_; }; } my $trans1 = fgenerator qw( add_one log times_3 ); my $trans2 = fgenerator qw( add_one add_one add_one times_3 fun ); my @data = (1, 2, 3); my @trans = $trans1->( @data ); print "@trans\n"; @trans = $trans2->( @data ); print "@trans\n";

In reply to Re^2: Transform Sequence Problem by hdb
in thread Transform Sequence Problem by wbirkett

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others romping around the Monastery: (8)
    As of 2015-11-25 17:27 GMT
    Find Nodes?
      Voting Booth?

      What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

      Results (683 votes), past polls