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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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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?:bool <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 [
  1: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>, 1:num, <span class="Constant">[ </span>
<span class="Constant">]</span>
]
</pre>
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