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lecture 15: fix typo

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Joel Kaasinen
2022-09-02 20:24:45 +03:00
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@@ -4218,7 +4218,7 @@ liftA2 sumMoney (parseMoney "123" "e") (parseMoney "xxx
</section> </section>
<section id="dealing-with-failure-alternative" data-number="7.7"> <section id="dealing-with-failure-alternative" data-number="7.7">
<h2 data-number="15.7"><span class="header-section-number">15.7</span> Dealing with Failure: <code>Alternative</code></h2> <h2 data-number="15.7"><span class="header-section-number">15.7</span> Dealing with Failure: <code>Alternative</code></h2>
<p>If you play around with applicatives a bit you’ll start to notice some limits to their power. For example, when writing parsers like we did in the <code>parseMoney</code> example, it would be nice to be able to try some a couple of different parsers and take any non-failure result. This is easy enough to write for a concrete Applicative like <code>Maybe</code>, as can be seen below.</p> <p>If you play around with applicatives a bit you’ll start to notice some limits to their power. For example, when writing parsers like we did in the <code>parseMoney</code> example, it would be nice to be able to try a couple of different parsers and take any non-failure result. This is easy enough to write for a concrete Applicative like <code>Maybe</code>, as can be seen below.</p>
<div class="sourceCode" id="cb380"><pre class="sourceCode haskell"><code class="sourceCode haskell"><span id="cb380-1"><a href="#cb380-1" aria-hidden="true" tabindex="-1"></a><span class="kw">data</span> <span class="dt">Answer</span> <span class="ot">=</span> <span class="dt">Yes</span> <span class="op">|</span> <span class="dt">No</span></span> <div class="sourceCode" id="cb380"><pre class="sourceCode haskell"><code class="sourceCode haskell"><span id="cb380-1"><a href="#cb380-1" aria-hidden="true" tabindex="-1"></a><span class="kw">data</span> <span class="dt">Answer</span> <span class="ot">=</span> <span class="dt">Yes</span> <span class="op">|</span> <span class="dt">No</span></span>
<span id="cb380-2"><a href="#cb380-2" aria-hidden="true" tabindex="-1"></a> <span class="kw">deriving</span> (<span class="dt">Show</span>, <span class="dt">Eq</span>)</span> <span id="cb380-2"><a href="#cb380-2" aria-hidden="true" tabindex="-1"></a> <span class="kw">deriving</span> (<span class="dt">Show</span>, <span class="dt">Eq</span>)</span>
<span id="cb380-3"><a href="#cb380-3" aria-hidden="true" tabindex="-1"></a></span> <span id="cb380-3"><a href="#cb380-3" aria-hidden="true" tabindex="-1"></a></span>