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lecture 16: fix QuickCheck rev example

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closes #111
This commit is contained in:
Joel Kaasinen
2025-09-26 09:54:00 +03:00
parent 656c8919a9
commit d670cedeb7
2 changed files with 4 additions and 4 deletions
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exercises/Examples/QuickCheck.hs
+2 -2
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@@ -5,8 +5,8 @@ import Data.Char
import Data.List import Data.List
rev :: [a] -> [a] rev :: [a] -> [a]
rev [] = [] rev (x:y:xs) = y:x:xs
rev (x:xs) = xs ++ [x] rev xs = xs
propRevSmall :: Property propRevSmall :: Property
propRevSmall = rev [1,2] === [2,1] propRevSmall = rev [1,2] === [2,1]
part2.html
+2 -2
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@@ -6329,8 +6329,8 @@ the file <a
href="https://github.com/moocfi/haskell-mooc/blob/master/exercises/Examples/QuickCheck.hs"><code>exercises/Examples/QuickCheck.hs</code></a>.</p> href="https://github.com/moocfi/haskell-mooc/blob/master/exercises/Examples/QuickCheck.hs"><code>exercises/Examples/QuickCheck.hs</code></a>.</p>
<div class="sourceCode" id="cb395"><pre <div class="sourceCode" id="cb395"><pre
class="sourceCode haskell"><code class="sourceCode haskell"><span id="cb395-1"><a href="#cb395-1" aria-hidden="true" tabindex="-1"></a><span class="ot">rev ::</span> [a] <span class="ot">-&gt;</span> [a]</span> class="sourceCode haskell"><code class="sourceCode haskell"><span id="cb395-1"><a href="#cb395-1" aria-hidden="true" tabindex="-1"></a><span class="ot">rev ::</span> [a] <span class="ot">-&gt;</span> [a]</span>
<span id="cb395-2"><a href="#cb395-2" aria-hidden="true" tabindex="-1"></a>rev [] <span class="ot">=</span> []</span> <span id="cb395-2"><a href="#cb395-2" aria-hidden="true" tabindex="-1"></a>rev (x<span class="op">:</span>y<span class="op">:</span>xs) <span class="ot">=</span> y<span class="op">:</span>x<span class="op">:</span>xs</span>
<span id="cb395-3"><a href="#cb395-3" aria-hidden="true" tabindex="-1"></a>rev (x<span class="op">:</span>xs) <span class="ot">=</span> xs <span class="op">++</span> [x]</span></code></pre></div> <span id="cb395-3"><a href="#cb395-3" aria-hidden="true" tabindex="-1"></a>rev xs <span class="ot">=</span> xs</span></code></pre></div>
<p>We can write an individual test case using the <code>===</code> <p>We can write an individual test case using the <code>===</code>
operator from QuickCheck:</p> operator from QuickCheck:</p>
<div class="sourceCode" id="cb396"><pre <div class="sourceCode" id="cb396"><pre