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<section class="section">
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<div class="section-content top-matter">
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<h1 id='unused-parameter' class='heading'>Unused Parameter</h1>
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<p>Other than unused local variable declarations, unused function/initializer/subscript parameters are not marked by the Swift compiler. Since unused parameters are code smells, they should either be removed or replaced/shadowed by a wildcard ‘_’ to indicate that they are being deliberately disregarded.</p>
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<ul>
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<li><strong>Identifier:</strong> <code>unused_parameter</code></li>
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<li><strong>Enabled by default:</strong> No</li>
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<li><strong>Supports autocorrection:</strong> Yes</li>
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<li><strong>Kind:</strong> lint</li>
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<li><strong>Analyzer rule:</strong> No</li>
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<li><strong>Minimum Swift compiler version:</strong> 5.0.0</li>
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<li><strong>Default configuration:</strong>
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<table>
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<thead>
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<tr><th>Key</th><th>Value</th></tr>
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</thead>
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<tbody>
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<tr>
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<td>
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severity
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</td>
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<td>
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warning
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</td>
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</tr>
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</tbody>
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</table></li>
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</ul>
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<h2 id='non-triggering-examples' class='heading'>Non Triggering Examples</h2>
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<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="p">{</span>
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<span class="n">_</span> <span class="o">=</span> <span class="n">a</span>
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<span class="p">}</span>
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</code></pre>
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<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">case</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="p">{</span>
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<span class="n">_</span> <span class="o">=</span> <span class="p">`</span><span class="nv">case</span><span class="p">`</span>
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<span class="p">}</span>
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</code></pre>
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<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="n">a</span> <span class="nv">_</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="p">{}</span>
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</code></pre>
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<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">_</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="n">b</span> <span class="nv">c</span><span class="p">:</span> <span class="kt">String</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">g</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="n">_</span> <span class="o">=</span> <span class="n">a</span>
|
||
<span class="n">_</span> <span class="o">=</span> <span class="n">c</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="nv">c</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Int</span> <span class="p">{</span>
|
||
<span class="kd">struct</span> <span class="kt">S</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">b</span> <span class="o">=</span> <span class="mi">1</span>
|
||
<span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="nv">b</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">2</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Int</span> <span class="p">{</span> <span class="n">a</span> <span class="o">+</span> <span class="n">b</span> <span class="p">}</span>
|
||
<span class="p">}</span>
|
||
<span class="k">return</span> <span class="n">a</span> <span class="o">+</span> <span class="n">c</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">?)</span> <span class="p">{</span>
|
||
<span class="k">if</span> <span class="k">let</span> <span class="nv">a</span> <span class="p">{}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">a</span>
|
||
<span class="k">return</span> <span class="n">a</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(`</span><span class="nv">operator</span><span class="p">`:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Int</span> <span class="p">{</span> <span class="p">`</span><span class="nv">operator</span><span class="p">`</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<h2 id='triggering-examples' class='heading'>Triggering Examples</h2>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="err">↓</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="err">↓</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="n">b</span> <span class="err">↓</span><span class="nv">c</span><span class="p">:</span> <span class="kt">String</span><span class="p">)</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="err">↓</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="n">b</span> <span class="err">↓</span><span class="nv">c</span><span class="p">:</span> <span class="kt">String</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">g</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="err">↓</span><span class="nv">b</span><span class="p">:</span> <span class="kt">Double</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="n">_</span> <span class="o">=</span> <span class="n">a</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">S</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span>
|
||
|
||
<span class="nf">init</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="err">↓</span><span class="nv">b</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="err">↓</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="nv">b</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Int</span> <span class="p">{</span> <span class="n">b</span> <span class="p">}</span>
|
||
<span class="k">self</span><span class="o">.</span><span class="n">a</span> <span class="o">=</span> <span class="nf">f</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="n">a</span><span class="p">,</span> <span class="nv">b</span><span class="p">:</span> <span class="mi">0</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">S</span> <span class="p">{</span>
|
||
<span class="nf">subscript</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="err">↓</span><span class="nv">b</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="err">↓</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="nv">b</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Int</span> <span class="p">{</span> <span class="n">b</span> <span class="p">}</span>
|
||
<span class="k">return</span> <span class="nf">f</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="n">a</span><span class="p">,</span> <span class="nv">b</span><span class="p">:</span> <span class="mi">0</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="err">↓</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="err">↓</span><span class="nv">b</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="nv">c</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Int</span> <span class="p">{</span>
|
||
<span class="kd">struct</span> <span class="kt">S</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">b</span> <span class="o">=</span> <span class="mi">1</span>
|
||
<span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="err">↓</span><span class="nv">c</span><span class="p">:</span> <span class="kt">Int</span> <span class="o">=</span> <span class="mi">2</span><span class="p">)</span> <span class="o">-></span> <span class="kt">Int</span> <span class="p">{</span> <span class="n">a</span> <span class="o">+</span> <span class="n">b</span> <span class="p">}</span>
|
||
<span class="p">}</span>
|
||
<span class="k">return</span> <span class="kt">S</span><span class="p">()</span><span class="o">.</span><span class="nf">f</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="n">c</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="err">↓</span><span class="nv">a</span><span class="p">:</span> <span class="kt">Int</span><span class="p">,</span> <span class="nv">c</span><span class="p">:</span> <span class="kt">String</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="mi">1</span>
|
||
<span class="k">return</span> <span class="n">a</span> <span class="o">+</span> <span class="n">c</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
|
||
</div>
|
||
</section>
|
||
|
||
|
||
</article>
|
||
</div>
|
||
<section class="footer">
|
||
<p>© 2023 <a class="link" href="https://jpsim.com" target="_blank" rel="external noopener">JP Simard</a> under MIT.</p>
|
||
<p>Generated by <a class="link" href="https://github.com/realm/jazzy" target="_blank" rel="external noopener">jazzy ♪♫ v0.15.3</a>, a <a class="link" href="https://realm.io" target="_blank" rel="external noopener">Realm</a> project.</p>
|
||
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|
||
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|
||
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