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» Error Prone
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<h1 class="post-title-main">Error Prone</h1>
</div>
<div class="post-content" data-github-edit-url="https://github.com/pmd/pmd/blob/main/docs/../pmd-swift/src/main/resources/category/swift/errorprone.xml">
<div class="summary">Rules to detect constructs that are either broken, extremely confusing or prone to runtime errors.</div>
<details id="inline-toc-details">
<summary>Table of Contents</summary>
<div id="inline-toc"><!-- empty, move TOC here when screen size too small --></div>
</details>
<!-- DO NOT EDIT THIS FILE. This file is generated from file ../pmd-swift/src/main/resources/category/swift/errorprone.xml. -->
<h2 id="forcecast">ForceCast</h2>
<p><strong>Since:</strong> PMD 7.0.0</p>
<p><strong>Priority:</strong> Medium (3)</p>
<p>Force casts should be avoided. This may lead to a crash if its not used carefully.
For example assuming a JSON property has a given type, or your reused Cell has a certain contract.
Consider using conditional casting and handling the resulting optional.</p>
<p><strong>This rule is defined by the following XPath expression:</strong></p>
<div class="language-xpath highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">//</span><span class="nt">TypeCastingOperator</span><span class="p">[</span><span class="nt">T</span><span class="o">-</span><span class="kr">as</span><span class="w"> </span><span class="ow">and</span><span class="w"> </span><span class="nt">T</span><span class="o">-</span><span class="nt">bang</span><span class="p">]</span><span class="w">
</span></code></pre></div></div>
<p><strong>Example(s):</strong></p>
<div class="language-swift highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">NSNumber</span><span class="p">()</span> <span class="k">as!</span> <span class="kt">Int</span> <span class="c1">// violation, force casting</span>
<span class="kt">NSNumber</span><span class="p">()</span> <span class="k">as?</span> <span class="kt">Int</span> <span class="c1">// no violation</span>
</code></pre></div></div>
<p><strong>Use this rule by referencing it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/swift/errorprone.xml/ForceCast"</span> <span class="nt">/&gt;</span>
</code></pre></div></div>
<h2 id="forcetry">ForceTry</h2>
<p><strong>Since:</strong> PMD 7.0.0</p>
<p><strong>Priority:</strong> Medium (3)</p>
<p>Force tries should be avoided. If the code being wrapped happens to raise and exception, our application will crash.
Consider using a conditional try and handling the resulting optional, or wrapping the try statement in a do-catch block.</p>
<p><strong>This rule is defined by the following XPath expression:</strong></p>
<div class="language-xpath highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">//</span><span class="nt">TryOperator</span><span class="p">[</span><span class="nt">T</span><span class="o">-</span><span class="nt">bang</span><span class="p">]</span><span class="w">
</span></code></pre></div></div>
<p><strong>Example(s):</strong></p>
<div class="language-swift highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">let</span> <span class="nv">x</span> <span class="o">=</span> <span class="k">try!</span> <span class="nf">someThrowingFunction</span><span class="p">()</span> <span class="c1">// violation, force trying</span>
<span class="k">let</span> <span class="nv">x</span> <span class="o">=</span> <span class="k">try</span><span class="p">?</span> <span class="nf">someThrowingFunction</span><span class="p">()</span> <span class="c1">// no violation</span>
</code></pre></div></div>
<p><strong>Use this rule by referencing it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/swift/errorprone.xml/ForceTry"</span> <span class="nt">/&gt;</span>
</code></pre></div></div>
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