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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>
<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:number<span class="muRecipe"> -> </span>result:number [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</span>
<span class="Constant"> <base-case></span>
<span class="Delimiter">}</span>
<span class="Constant"> <recursive-case></span>
]
<span class="muRecipe">after</span> <span class="Constant"><base-case></span> [
<span class="Comment"># if n=0 return 1</span>
zero?:boolean<span class="Special"> <- </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"><recursive-case></span> [
<span class="Comment"># return n * factorial(n - 1)</span>
x:number<span class="Special"> <- </span>subtract n, <span class="Constant">1</span>
subresult:number<span class="Special"> <- </span>factorial x
result<span class="Special"> <- </span>multiply subresult, n
]
<span class="muRecipe">def</span> main [
<span class="Constant">1</span>:number<span class="Special"> <- </span>factorial <span class="Constant">5</span>
$print <span class="Constant">[result: ]</span>, <span class="Constant">1</span>:number, [
]
]
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