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<title>Mu - tangle.mu</title>
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<pre id='vimCodeElement'>
<span class="Comment"># example program: constructing recipes 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">recipe</span> factorial [
<span class="Constant">local-scope</span>
n:number<span class="Special"> <- </span><span class="Constant">next-ingredient</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> +base-case [
<span class="Comment"># if n=0 return 1</span>
zero?:boolean<span class="Special"> <- </span>equal n:number, <span class="Constant">0:literal</span>
<span class="muControl">break-unless</span> zero?:boolean
<span class="muControl">reply</span> <span class="Constant">1:literal</span>
]
<span class="muRecipe">after</span> +recursive-case [
<span class="Comment"># return n * factorial(n - 1)</span>
x:number<span class="Special"> <- </span>subtract n:number, <span class="Constant">1:literal</span>
subresult:number<span class="Special"> <- </span>factorial x:number
result:number<span class="Special"> <- </span>multiply subresult:number, n:number
<span class="muControl">reply</span> result:number
]
<span class="muRecipe">recipe</span> main [
1:number<span class="Special"> <- </span>factorial <span class="Constant">5:literal</span>
$print <span class="Constant">[result: ]</span>, 1:number, [
]
]
</pre>
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