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<title>Mu - tangle.mu</title>
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<a href='https://github.com/akkartik/mu/blob/master/tangle.mu'>https://github.com/akkartik/mu/blob/master/tangle.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment"># example program: constructing functions out of order</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment"># We construct a factorial function with separate base and recursive cases.</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment"># Compare factorial.mu.</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">#</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment"># This isn't a very tasteful example, just a basic demonstration of</span>
<span id="L7" class="LineNr"> 7 </span><span class="Comment"># possibilities.</span>
<span id="L8" class="LineNr"> 8 </span>
<span id="L9" class="LineNr"> 9 </span><span class="muRecipe">def</span> <a href='tangle.mu.html#L9'>factorial</a> n:num<span class="muRecipe"> -> </span>result:num [
<span id="L10" class="LineNr">10 </span> <span class="Constant">local-scope</span>
<span id="L11" class="LineNr">11 </span> <span class="Constant">load-inputs</span>
<span id="L12" class="LineNr">12 </span><span class="Constant"> <a href='tangle.mu.html#L12'><factorial-cases></a></span>
<span id="L13" class="LineNr">13 </span>]
<span id="L14" class="LineNr">14 </span>
<span id="L15" class="LineNr">15 </span><span class="muRecipe">after</span> <span class="Constant"><a href='tangle.mu.html#L12'><factorial-cases></a></span> [
<span id="L16" class="LineNr">16 </span> <span class="Comment"># if n=0 return 1</span>
<span id="L17" class="LineNr">17 </span> <span class="muControl">return-unless</span> n,<span class="Constant"> 1</span>
<span id="L18" class="LineNr">18 </span>]
<span id="L19" class="LineNr">19 </span>
<span id="L20" class="LineNr">20 </span><span class="muRecipe">after</span> <span class="Constant"><a href='tangle.mu.html#L12'><factorial-cases></a></span> [
<span id="L21" class="LineNr">21 </span> <span class="Comment"># return n * factorial(n - 1)</span>
<span id="L22" class="LineNr">22 </span> <span class="Delimiter">{</span>
<span id="L23" class="LineNr">23 </span> <span class="muControl">break-unless</span> n
<span id="L24" class="LineNr">24 </span> x:num <span class="Special"><-</span> subtract n,<span class="Constant"> 1</span>
<span id="L25" class="LineNr">25 </span> subresult:num <span class="Special"><-</span> <a href='tangle.mu.html#L9'>factorial</a> x
<span id="L26" class="LineNr">26 </span> result <span class="Special"><-</span> multiply subresult, n
<span id="L27" class="LineNr">27 </span> <span class="muControl"> return</span> result
<span id="L28" class="LineNr">28 </span> <span class="Delimiter">}</span>
<span id="L29" class="LineNr">29 </span>]
<span id="L30" class="LineNr">30 </span>
<span id="L31" class="LineNr">31 </span><span class="muRecipe">def</span> <a href='tangle.mu.html#L31'>main</a> [
<span id="L32" class="LineNr">32 </span> 1:num <span class="Special"><-</span> <a href='tangle.mu.html#L9'>factorial</a><span class="Constant"> 5</span>
<span id="L33" class="LineNr">33 </span> <span class="Comment"># trailing space in next line is to help with syntax highlighting</span>
<span id="L34" class="LineNr">34 </span> $print <span class="Constant">[result: ]</span>, 1:num, <span class="Constant">[ </span>
<span id="L35" class="LineNr">35 </span><span class="Constant">]</span>
<span id="L36" class="LineNr">36 </span>]
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