The word "predicate" was used here not in logical terms, but vaguely refers to the term used in (functional) programming. The origin of the term was though largely stemmed from perl. Perl functions map, grep, and sort, for example, receive their first argument a special function, and a list of arguments. In functional programming, these mapping functions (callbacks, not map/grep themselves) are sometimes called predicates.

In Io::Lambda, functions like sleep() and tail() are declared very similarly. They also accept a function and a list of arguments. The only semantic difference is that the label "predicate" has moved away from the callback to the function itself. That possibly questions if the choice of the word itself was appropriate, however, I couldn't find a better one.

In reply to Re^7: IO::Lambda: call for participation by dk
in thread IO::Lambda: call for participation by dk

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.