»»» This post is about the immature Perl 6, not the rock solid Perl 5 «««

I often share small things about P6. This is perhaps the smallest yet...

So I just encountered this series of recent blog posts by someone exploring P6. Anyhoo, this meditation isn't about what he's written but the P6 feature brought to my attention by a comment added to his 5th post which shows something like this: 

say sort +*, @array;

[download]

Apparently this is akin to a schwartzian transform (which a 4 year old PM post by Moritz suggests is implemented more efficiently than an actual schwartzian transform).

Update At least two monks failed to see a strong (or any) connection between say sort +*, @array and the ST. In summary the * is a single arg "key extractor" closure, and the P6 sort builtin automatically turns @sorted = sort +*, @array in to something like the P5 code: 

@sorted = map $_->[0],
          sort { $a->[1] <=> $b->[1] }
          map [ $_, +$_ ],
          @array;

[download]

/Update

Perhaps everyone else already knew this, but I didn't and, weeell... I think it's amazingly short and it came directly on the heels of another tiny triumph of P6 brevity.

Of course, the main point of the transform is speed, and as the author of the quoted blog mentions in one of his posts, P6 is still slooow (even if it has gotten something like an order of magnitude faster this year for many tasks). But a secondary point of the transform is that it's a nice idiom and I think this is another example of the wide array of nice P6 idioms.

»ö« . o O ( "the celebrity tell-all of the Perl-6 cult?" )

In reply to sort +*, @array by raiph

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.