This is something it i would like to share because the technique was so often mentioned on PM and never really explained as far as i can remember.

By chance i stumbled over List::Gen which provides slide {CODE} WINDOW LIST.

Unfortunately the module doesn't compile on my system/with my Perl version.

But it seems to be quite easy to steal some code from it that seems to work like a charm:

#!/usr/bin/env perl

use strict;
use warnings;
use List::Util::PP qw(min reduce);
use feature qw(say);
sub slide (&$@);

say slide {qq(@_\n)} 2 => 1 .. 4;
say slide {uc qq(@_\n)} 2 =>  qw(nose cuke foo bar);

sub slide (&$@) {
    my ($code, $window) = splice @_, 0, 2;
    $window--;
    map $code->(@_[$_ .. min $_+$window, $#_]) => 0 .. $#_;
}

__END__

Karls-Mac-mini:Desktop karl$
1 2
2 3
3 4
4

NOSE CUKE
CUKE FOO
FOO BAR
BAR

[download]

To me this looks like it works as designed and expected.

Thanks for any hint and comment. Best regards, Karl

«The Crux of the Biscuit is the Apostrophe»

perl -MCrypt::CBC -E 'say Crypt::CBC->new(-key=>'kgb',-cipher=>"Blowfish")->decrypt_hex($ENV{KARL});'Help

In reply to Sliding window revisited: Is it OK to make it so? by karlgoethebier

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.