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generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-12-29 19:59:55 +0000
vc@akkartik.com> 2016-03-09 02:56:27 -0800 committer Kartik K. Agaram <vc@akkartik.com> 2016-03-09 02:56:27 -0800 2743' href='/akkartik/mu/commit/html/tangle.mu.html?h=main&id=4690ce81e079fc58cae8d6d583e5e3eb3ed81a83'>4690ce81 ^ 
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<title>Mu - tangle.mu</title>
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<pre id='vimCodeElement'>
<span class="Comment"># example program: constructing functions out of order</span>
<span class="Comment">#</span>
<span class="Comment"># We construct a factorial function with separate base and recursive cases.</span>
<span class="Comment"># Compare factorial.mu.</span>
<span class="Comment">#</span>
<span class="Comment"># This isn't a very tasteful example, just a simple demonstration of</span>
<span class="Comment"># possibilities.</span>

<span class="muRecipe">def</span> factorial n:num<span class="muRecipe"> -&gt; </span>result:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Delimiter">{</span>
<span class="Constant">    &lt;base-case&gt;</span>
  <span class="Delimiter">}</span>
<span class="Constant">  &lt;recursive-case&gt;</span>
]

<span class="muRecipe">after</span> <span class="Constant">&lt;base-case&gt;</span> [
  <span class="Comment"># if n=0 return 1</span>
  zero?:boolean<span class="Special"> &lt;- </span>equal n, <span class="Constant">0</span>
  <span class="muControl">break-unless</span> zero?
  <span class="muControl">return</span> <span class="Constant">1</span>
]

<span class="muRecipe">after</span> <span class="Constant">&lt;recursive-case&gt;</span> [
  <span class="Comment"># return n * factorial(n - 1)</span>
  x:num<span class="Special"> &lt;- </span>subtract n, <span class="Constant">1</span>
  subresult:num<span class="Special"> &lt;- </span>factorial x
  result<span class="Special"> &lt;- </span>multiply subresult, n
]

<span class="muRecipe">def</span> main [
  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>factorial <span class="Constant">5</span>
  <span class="Comment"># trailing space in next line is to help with syntax highlighting</span>
  $print <span class="Constant">[result: ]</span>, <span class="Constant">1</span>:num, <span class="Constant">[ </span>
<span class="Constant">]</span>
]
</pre>
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