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lecture 13: fix increase example

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closes #36
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Joel Kaasinen
2021-06-09 18:21:01 +03:00
parent e479312849
commit c2a165d27c
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@@ -2540,7 +2540,7 @@ Query the user for a number and return it.
<a class="sourceLine" id="cb208-4" data-line-number="4"> check <span class="fu">?&gt;</span></a>
<a class="sourceLine" id="cb208-5" data-line-number="5"> buildResult</a>
<a class="sourceLine" id="cb208-6" data-line-number="6"> <span class="kw">where</span> check x</a>
<a class="sourceLine" id="cb208-7" data-line-number="7"> <span class="fu">|</span> x <span class="fu">&lt;</span> val <span class="fu">=</span> <span class="dt">Nothing</span></a>
<a class="sourceLine" id="cb208-7" data-line-number="7"> <span class="fu">|</span> val <span class="fu">&lt;</span> x <span class="fu">=</span> <span class="dt">Nothing</span></a>
<a class="sourceLine" id="cb208-8" data-line-number="8"> <span class="fu">|</span> otherwise <span class="fu">=</span> <span class="dt">Just</span> x</a>
<a class="sourceLine" id="cb208-9" data-line-number="9"> buildResult x <span class="fu">=</span> <span class="dt">Just</span> ((key,val) <span class="fu">:</span> delete (key,x) assocs)</a></code></pre></div>
<p>Here’s another example: safe list indexing built from <code>safeHead</code> and <code>safeTail</code>:</p>