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<title>Mu - factorial.mu</title>
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<pre id='vimCodeElement'>
<span class="Comment"># example program: compute the factorial of 5</span>
<span class="muRecipe">def</span> main [
<span class="Constant">local-scope</span>
x:num<span class="Special"> <- </span>factorial <span class="Constant">5</span>
$print <span class="Constant">[result: ]</span>, x, <span class="Constant">[ </span>
<span class="Constant">]</span>
]
<span class="muRecipe">def</span> factorial n:num<span class="muRecipe"> -> </span>result:num [
<span class="Constant">local-scope</span>
<span class="Constant">load-ingredients</span>
<span class="Delimiter">{</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="Delimiter">}</span>
<span class="Comment"># return n * factorial(n-1)</span>
x:num<span class="Special"> <- </span>subtract n, <span class="Constant">1</span>
subresult:num<span class="Special"> <- </span>factorial x
result<span class="Special"> <- </span>multiply subresult, n
]
<span class="Comment"># unit test</span>
<span class="muScenario">scenario</span> factorial-test [
run [
<span class="Constant">1</span>:num<span class="Special"> <- </span>factorial <span class="Constant">5</span>
]
memory-should-contain [
<span class="Constant">1</span><span class="Special"> <- </span><span class="Constant">120</span>
]
]
</pre>
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