This seems to work.

knoppix@Microknoppix:~$ perl -E '
> @l = qw{ a bb c d e f g h };
> say sub { join q{ }, @_ }->(
>     grep defined, map shift @l, 1 .. 3
>     ) while @l;'
a bb c
d e f
g h
knoppix@Microknoppix:~$

[download]

I also piped the output through hexdump to check that there were no trailing spaces (which you do get without the grep).

Update: Using List::Util::min() to remove the need for the grep. 

knoppix@Microknoppix:~$ perl -MList::Util=min -E '
> @l = qw{ a bb c d e f g h };
> say sub { join q{ }, @_ }->(
>     map shift @l, 1 .. min( 3, scalar @l )
>     ) while @l;'
a bb c
d e f
g h
knoppix@Microknoppix:~$

[download]

Cheers,

JohnGG

In reply to Re: Rosetta code: Split an array into chunks by johngg
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!
  • 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.