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

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Here is a Perl 6 solution in a single statement. It's probably not the best solution, but it does work today in rakudo:
my @l = <a bb c d e f g h>; sub chunky(@l, $len) { (0, $len ...^ *>=@l).map({@l[$_ .. ($_ + $len - 1 min @l.end)] ~ " +\n" }).join } print chunky(@l, 3);

The 0, $len ...^ *>=@l creates a list in steps of $len, up to (but excluding) the number of elements in @l.

Inside the map there is an array slice. The min @l.end is only necessary because Rakudo doesn't clip array slices to the end of the list yet (which is a known and reported bug).

I'm still looking for a nicer solution, will update my post if I find one.

Update: Nicer solution:

my @l = <a bb c d e f g h>; sub chunky(@l, $len) { (@l Z (' ' xx $len - 1, "\n") xx *).join.substr(0, -1) ~ "\n"; } print chunky(@l, 3);

This creates an infinite list (' ', ' ', "\n", ' ', ' ', "\n", ...), and then zips the input list with it. (zip = takes one item from each list in turn). Zips stops when the shortest list is exhausted, so we don't have to worry about it looping forever.

The result is then joined together, and the last separator is unconditionally substituted for a newline.

Perl 6 - links to (nearly) everything that is Perl 6.

In reply to Re: Rosetta code: Split an array into chunks by moritz
in thread Rosetta code: Split an array into chunks by eyepopslikeamosquito

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!
  • 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
  • Outside of code tags, you may need to use entities for some characters:
            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?
    Username:
    Password:

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

    How do I use this? | Other CB clients
    Other Users?
    Others imbibing at the Monastery: (9)
    As of 2014-10-31 06:35 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      For retirement, I am banking on:










      Results (215 votes), past polls