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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?:bool <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 [
1: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>
]
]
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