> This works okay, but I wonder if there is a better and faster way.

Like always... it depends what you wanna do and how flexible you need to be!

If you are calling a fixed trans() very often, you could consider eval to generate it with chained map statements.

something like

 eval 'sub trans {  map {$_ + 1} map {log($_)} map {$_ * 3} @_ }'

You'll need to hold the map-codes as an array of strings.

But your functional approach is more flexible (eg. for debugging) ! =)

edit

you could avoid 3 loops by applying the transformations directly in one loop

 eval 'sub trans {  map { log($_ * 3) + 1} @_ }'

again this can be constructed as strings (s///ubstituting $_) and evaled ....

...OR functionally with

 sub trans {  map { $f1->($f2->($f3->($_))) } @_ }

update

or better (untested)

 
sub trans {
  for my $val (@_) {
     $val = $_->( $val) for @transforms;
  }
  return @_;
}

[download]

@transform needs to be in the closure, maybe consider passing it as arr-ref as first argument.

 $a_transforms =  shift

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re: Transform Sequence Problem by LanX
in thread Transform Sequence Problem by wbirkett

Title:
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, details, 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, summary, 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.