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Simon Forman
2023-02-12 16:00:45 -08:00
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<blockquote>
<p>Simple pleasures are the best.</p>
</blockquote>
<p>Joy is a programming language created by Manfred von Thun that is easy to
use and understand and has many other nice properties. This project
implements interpreters for a dialect that attempts to stay very close to
<p><a href="https://en.wikipedia.org/wiki/Joy_%28programming_language%29">Joy</a>
is a programming language created by Manfred von Thun that is easy to
use and understand and has many other nice properties.
<strong>Thun</strong> is a dialect of Joy that attempts to stay very close to
the spirit of Joy but does not precisely match the behaviour of the
original version written in C.</p>
<p>Joy is:</p>
@@ -32,19 +33,21 @@ which contains source code for the original C interpreter, Joy language source c
and a great deal of fascinating material mostly written by Von Thun on
Joy and its deeper facets as well as how to program in it and several
interesting aspects. It's quite a treasure trove.</p>
<p><a href="https://en.wikipedia.org/wiki/Joy_%28programming_language%29">Wikipedia entry for Joy</a></p>
<p><a href="http://www.latrobe.edu.au/humanities/research/research-projects/past-projects/joy-programming-language">Homepage at La Trobe University</a></p>
<p><a href="https://web.archive.org/web/20220411010035/https://joypy.osdn.io/">The original Thun/Joypy site</a></p>
<ul>
<li><a href="https://en.wikipedia.org/wiki/Joy_%28programming_language%29">Wikipedia entry for Joy</a></li>
<li><a href="http://www.latrobe.edu.au/humanities/research/research-projects/past-projects/joy-programming-language">Homepage at La Trobe University</a></li>
<li><a href="https://web.archive.org/web/20220411010035/https://joypy.osdn.io/">The original Thun/Joypy site</a></li>
</ul>
<h2>Example Code</h2>
<p>Here is an example of Joy code:</p>
<pre><code>square_spiral ≡ [_p] [_then] [_else] ifte
<pre><code>square_spiral [_p] [_then] [_else] ifte
_p ≡ [_p0] [_p1] &amp;&amp;
_p0 ≡ [abs] ii &lt;=
_p1 ≡ [&lt;&gt;] [pop !-] ||
_p [_p0] [_p1] &amp;&amp;
_p0 [abs] ii &lt;=
_p1 [&lt;&gt;] [pop !-] ||
_then ≡ [ !-] [[++]] [[--]] ifte dip
_else ≡ [pop !-] [--] [++] ifte
_then [ !-] [[++]] [[--]] ifte dip
_else [pop !-] [--] [++] ifte
</code></pre>
<p>It might seem unreadable but with a little familiarity it becomes just as legible as any other notation.</p>
<p>This function accepts two integers on the stack and increments or