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<h1 id='void-function-in-ternary' class='heading'>Void Function in Ternary</h1>
<p>Using ternary to call Void functions should be avoided</p>
<ul>
<li><strong>Identifier:</strong> <code>void_function_in_ternary</code></li>
<li><strong>Enabled by default:</strong> Yes</li>
<li><strong>Supports autocorrection:</strong> No</li>
<li><strong>Kind:</strong> idiomatic</li>
<li><strong>Analyzer rule:</strong> No</li>
<li><strong>Minimum Swift compiler version:</strong> 5.1.0</li>
<li><strong>Default configuration:</strong>
<table>
<thead>
<tr><th>Key</th><th>Value</th></tr>
</thead>
<tbody>
<tr>
<td>
severity
</td>
<td>
warning
</td>
</tr>
</tbody>
</table></li>
</ul>
<h2 id='non-triggering-examples' class='heading'>Non Triggering Examples</h2>
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">result</span> <span class="o">=</span> <span class="n">success</span> <span class="p">?</span> <span class="nf">foo</span><span class="p">()</span> <span class="p">:</span> <span class="nf">bar</span><span class="p">()</span>
</code></pre>
<pre class="highlight swift"><code><span class="k">if</span> <span class="n">success</span> <span class="p">{</span>
<span class="nf">askQuestion</span><span class="p">()</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="nf">exit</span><span class="p">()</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">price</span><span class="p">:</span> <span class="kt">Double</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">hasDiscount</span> <span class="p">?</span> <span class="nf">calculatePriceWithDiscount</span><span class="p">()</span> <span class="p">:</span> <span class="nf">calculateRegularPrice</span><span class="p">()</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="nf">foo</span><span class="p">(</span><span class="n">x</span> <span class="o">==</span> <span class="mi">2</span> <span class="p">?</span> <span class="nf">a</span><span class="p">()</span> <span class="p">:</span> <span class="nf">b</span><span class="p">())</span>
</code></pre>
<pre class="highlight swift"><code><span class="n">chevronView</span><span class="o">.</span><span class="n">image</span> <span class="o">=</span> <span class="n">collapsed</span> <span class="p">?</span> <span class="o">.</span><span class="nf">icon</span><span class="p">(</span><span class="o">.</span><span class="n">mediumChevronDown</span><span class="p">)</span> <span class="p">:</span> <span class="o">.</span><span class="nf">icon</span><span class="p">(</span><span class="o">.</span><span class="n">mediumChevronUp</span><span class="p">)</span>
</code></pre>
<pre class="highlight swift"><code><span class="n">array</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="n">elem</span> <span class="k">in</span>
<span class="n">elem</span><span class="o">.</span><span class="nf">isEmpty</span><span class="p">()</span> <span class="p">?</span> <span class="o">.</span><span class="nf">emptyValue</span><span class="p">()</span> <span class="p">:</span> <span class="o">.</span><span class="nf">number</span><span class="p">(</span><span class="n">elem</span><span class="p">)</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">compute</span><span class="p">(</span><span class="nv">data</span><span class="p">:</span> <span class="p">[</span><span class="kt">Int</span><span class="p">])</span> <span class="o">-&gt;</span> <span class="kt">Int</span> <span class="p">{</span>
<span class="n">data</span><span class="o">.</span><span class="n">isEmpty</span> <span class="p">?</span> <span class="mi">0</span> <span class="p">:</span> <span class="nf">expensiveComputation</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">value</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span>
<span class="n">mode</span> <span class="o">==</span> <span class="o">.</span><span class="n">fast</span> <span class="p">?</span> <span class="nf">fastComputation</span><span class="p">()</span> <span class="p">:</span> <span class="nf">expensiveComputation</span><span class="p">()</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">value</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span>
<span class="k">get</span> <span class="p">{</span>
<span class="n">mode</span> <span class="o">==</span> <span class="o">.</span><span class="n">fast</span> <span class="p">?</span> <span class="nf">fastComputation</span><span class="p">()</span> <span class="p">:</span> <span class="nf">expensiveComputation</span><span class="p">()</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="nf">subscript</span><span class="p">(</span><span class="nv">index</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Int</span> <span class="p">{</span>
<span class="k">get</span> <span class="p">{</span>
<span class="n">index</span> <span class="o">==</span> <span class="mi">0</span> <span class="p">?</span> <span class="nf">defaultValue</span><span class="p">()</span> <span class="p">:</span> <span class="nf">compute</span><span class="p">(</span><span class="n">index</span><span class="p">)</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="nf">subscript</span><span class="p">(</span><span class="nv">index</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Int</span> <span class="p">{</span>
<span class="n">index</span> <span class="o">==</span> <span class="mi">0</span> <span class="p">?</span> <span class="nf">defaultValue</span><span class="p">()</span> <span class="p">:</span> <span class="nf">compute</span><span class="p">(</span><span class="n">index</span><span class="p">)</span>
</code></pre>
<h2 id='triggering-examples' class='heading'>Triggering Examples</h2>
<pre class="highlight swift"><code><span class="n">success</span> <span class="err">↓</span><span class="p">?</span> <span class="nf">askQuestion</span><span class="p">()</span> <span class="p">:</span> <span class="nf">exit</span><span class="p">()</span>
</code></pre>
<pre class="highlight swift"><code><span class="n">perform</span> <span class="p">{</span> <span class="n">elem</span> <span class="k">in</span>
<span class="n">elem</span><span class="o">.</span><span class="nf">isEmpty</span><span class="p">()</span> <span class="err">↓</span><span class="p">?</span> <span class="o">.</span><span class="nf">emptyValue</span><span class="p">()</span> <span class="p">:</span> <span class="o">.</span><span class="nf">number</span><span class="p">(</span><span class="n">elem</span><span class="p">)</span>
<span class="k">return</span> <span class="mi">1</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="kt">DispatchQueue</span><span class="o">.</span><span class="n">main</span><span class="o">.</span><span class="k">async</span> <span class="p">{</span>
<span class="k">self</span><span class="o">.</span><span class="n">sectionViewModels</span><span class="p">[</span><span class="n">section</span><span class="p">]</span><span class="o">.</span><span class="n">collapsed</span><span class="o">.</span><span class="nf">toggle</span><span class="p">()</span>
<span class="k">self</span><span class="o">.</span><span class="n">sectionViewModels</span><span class="p">[</span><span class="n">section</span><span class="p">]</span><span class="o">.</span><span class="n">collapsed</span>
<span class="err">↓</span><span class="p">?</span> <span class="k">self</span><span class="o">.</span><span class="n">tableView</span><span class="o">.</span><span class="nf">deleteRows</span><span class="p">(</span><span class="nv">at</span><span class="p">:</span> <span class="p">[</span><span class="kt">IndexPath</span><span class="p">(</span><span class="nv">row</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="nv">section</span><span class="p">:</span> <span class="n">section</span><span class="p">)],</span> <span class="nv">with</span><span class="p">:</span> <span class="o">.</span><span class="n">automatic</span><span class="p">)</span>
<span class="p">:</span> <span class="k">self</span><span class="o">.</span><span class="n">tableView</span><span class="o">.</span><span class="nf">insertRows</span><span class="p">(</span><span class="nv">at</span><span class="p">:</span> <span class="p">[</span><span class="kt">IndexPath</span><span class="p">(</span><span class="nv">row</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="nv">section</span><span class="p">:</span> <span class="n">section</span><span class="p">)],</span> <span class="nv">with</span><span class="p">:</span> <span class="o">.</span><span class="n">automatic</span><span class="p">)</span>
<span class="k">self</span><span class="o">.</span><span class="n">tableView</span><span class="o">.</span><span class="nf">scrollToRow</span><span class="p">(</span><span class="nv">at</span><span class="p">:</span> <span class="kt">IndexPath</span><span class="p">(</span><span class="nv">row</span><span class="p">:</span> <span class="kt">NSNotFound</span><span class="p">,</span> <span class="nv">section</span><span class="p">:</span> <span class="n">section</span><span class="p">),</span> <span class="nv">at</span><span class="p">:</span> <span class="o">.</span><span class="n">top</span><span class="p">,</span> <span class="nv">animated</span><span class="p">:</span> <span class="kc">true</span><span class="p">)</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="nf">subscript</span><span class="p">(</span><span class="nv">index</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Int</span> <span class="p">{</span>
<span class="n">index</span> <span class="o">==</span> <span class="mi">0</span> <span class="err">↓</span><span class="p">?</span> <span class="nf">something</span><span class="p">()</span> <span class="p">:</span> <span class="nf">somethingElse</span><span class="p">(</span><span class="n">index</span><span class="p">)</span>
<span class="k">return</span> <span class="n">index</span>
</code></pre>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">value</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span>
<span class="n">mode</span> <span class="o">==</span> <span class="o">.</span><span class="n">fast</span> <span class="err">↓</span><span class="p">?</span> <span class="nf">something</span><span class="p">()</span> <span class="p">:</span> <span class="nf">somethingElse</span><span class="p">()</span>
<span class="k">return</span> <span class="mi">0</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">value</span><span class="p">:</span> <span class="kt">Int</span> <span class="p">{</span>
<span class="k">get</span> <span class="p">{</span>
<span class="n">mode</span> <span class="o">==</span> <span class="o">.</span><span class="n">fast</span> <span class="err">↓</span><span class="p">?</span> <span class="nf">something</span><span class="p">()</span> <span class="p">:</span> <span class="nf">somethingElse</span><span class="p">()</span>
<span class="k">return</span> <span class="mi">0</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre>
<pre class="highlight swift"><code><span class="nf">subscript</span><span class="p">(</span><span class="nv">index</span><span class="p">:</span> <span class="kt">Int</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Int</span> <span class="p">{</span>
<span class="k">get</span> <span class="p">{</span>
<span class="n">index</span> <span class="o">==</span> <span class="mi">0</span> <span class="err">↓</span><span class="p">?</span> <span class="nf">something</span><span class="p">()</span> <span class="p">:</span> <span class="nf">somethingElse</span><span class="p">(</span><span class="n">index</span><span class="p">)</span>
<span class="k">return</span> <span class="n">index</span>
<span class="p">}</span>
</code></pre>
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