COWSEL

<h2 id="example-code">Example code</h2>
function member
lambda x y
comment Is x a member of list y;
define      y atom then *0 end
            y hd x equal then *1 end
            y tl -> y repeat up

<p><a href="/facts/Reserved_word/pHDlUUgY">Reserved words</a> (keywords) were also underlined in the original printouts. Popplestone performed <a href="/facts/Syntax_highlighting/cLCr5a6w">syntax highlighting</a> by using underscoring on a <a href="/facts/Friden_Flexowriter/otaj1t59">Friden Flexowriter</a>.
</p>
<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/POP-2/5hdL9dPY">POP-2</a> programming language</li>
<li><a href="/facts/POP-11/CzAgWBy1">POP-11</a> programming language</li>
<li><a href="/facts/Poplog/I5wlXhch">Poplog</a> programming environment</li></ul>

<ul><li>Technical report: EPU-R-12, U Edinburgh (Apr 1966)</li></ul>
<h2 id="external-links">External links</h2>
<ul><li><a href="https://web.archive.org/web/20080906044133/http://hopl.murdoch.edu.au/showlanguage2.prx?exp=196">"The Early Development of POP" on The Encyclopedia of Computer Languages</a></li></ul>

COWSEL open-in-new

COWSEL