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<div class="section-content top-matter">
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<h1 id='array-init' class='heading'>Array Init</h1>
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<p>Prefer using <code>Array(seq)</code> over <code>seq.map { $0 }</code> to convert a sequence into an Array</p>
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<ul>
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<li><strong>Identifier:</strong> <code>array_init</code></li>
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<li><strong>Enabled by default:</strong> No</li>
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<li><strong>Supports autocorrection:</strong> No</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='rationale' class='heading'>Rationale</h2>
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<p>When converting the elements of a sequence directly into an <code>Array</code>, for clarity, prefer using the <code>Array</code> constructor over calling <code>map</code>. For example</p>
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<pre class="highlight swift"><code><span class="kt">Array</span><span class="p">(</span><span class="n">foo</span><span class="p">)</span>
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</code></pre>
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<p>rather than</p>
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<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="err">↓</span><span class="nf">map</span><span class="p">({</span> <span class="nv">$0</span> <span class="p">})</span>
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</code></pre>
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<p>If some processing of the elements is required, then using <code>map</code> is fine. For example</p>
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<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="o">!</span><span class="nv">$0</span> <span class="p">}</span>
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</code></pre>
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<p>Constructs like</p>
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<pre class="highlight swift"><code><span class="kd">enum</span> <span class="kt">MyError</span><span class="p">:</span> <span class="kt">Error</span> <span class="p">{}</span>
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<span class="k">let</span> <span class="nv">myResult</span><span class="p">:</span> <span class="kt">Result</span><span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="kt">MyError</span><span class="o">></span> <span class="o">=</span> <span class="o">.</span><span class="nf">success</span><span class="p">(</span><span class="s">""</span><span class="p">)</span>
|
||
<span class="k">let</span> <span class="nv">result</span><span class="p">:</span> <span class="kt">Result</span><span class="o"><</span><span class="kt">Any</span><span class="p">,</span> <span class="kt">MyError</span><span class="o">></span> <span class="o">=</span> <span class="n">myResult</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="nv">$0</span> <span class="p">}</span>
|
||
</code></pre>
|
||
|
||
<p>may be picked up as false positives by the <code>array_init</code> rule. If your codebase contains constructs like this, consider using the <code><a href="typesafe_array_init.html">typesafe_array_init</a></code> analyzer rule instead.</p>
|
||
<h2 id='non-triggering-examples' class='heading'>Non Triggering Examples</h2>
|
||
<pre class="highlight swift"><code><span class="kt">Array</span><span class="p">(</span><span class="n">foo</span><span class="p">)</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="nv">$0</span><span class="o">.</span><span class="mi">0</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="nv">$1</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="nv">$0</span><span class="p">()</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="p">((),</span> <span class="nv">$0</span><span class="p">)</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="nv">$0</span><span class="o">!</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="nv">$0</span><span class="o">!</span> <span class="cm">/* force unwrap */</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="n">something</span> <span class="p">{</span> <span class="kt">RouteMapper</span><span class="o">.</span><span class="nf">map</span><span class="p">(</span><span class="nv">$0</span><span class="p">)</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="o">!</span><span class="nv">$0</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="cm">/* a comment */</span> <span class="o">!</span><span class="nv">$0</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<h2 id='triggering-examples' class='heading'>Triggering Examples</h2>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="err">↓</span><span class="nf">map</span><span class="p">({</span> <span class="nv">$0</span> <span class="p">})</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="err">↓</span><span class="n">map</span> <span class="p">{</span> <span class="nv">$0</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="err">↓</span><span class="n">map</span> <span class="p">{</span> <span class="k">return</span> <span class="nv">$0</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="err">↓</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="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="err">↓</span><span class="n">map</span> <span class="p">{</span> <span class="n">elem</span> <span class="k">in</span>
|
||
<span class="k">return</span> <span class="n">elem</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="err">↓</span><span class="n">map</span> <span class="p">{</span> <span class="p">(</span><span class="nv">elem</span><span class="p">:</span> <span class="kt">String</span><span class="p">)</span> <span class="k">in</span>
|
||
<span class="n">elem</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="err">↓</span><span class="n">map</span> <span class="p">{</span> <span class="n">elem</span> <span class="o">-></span> <span class="kt">String</span> <span class="k">in</span>
|
||
<span class="n">elem</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="err">↓</span><span class="n">map</span> <span class="p">{</span> <span class="nv">$0</span> <span class="cm">/* a comment */</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="n">foo</span><span class="o">.</span><span class="err">↓</span><span class="n">map</span> <span class="p">{</span> <span class="cm">/* a comment */</span> <span class="nv">$0</span> <span class="p">}</span>
|
||
</code></pre>
|
||
|
||
</div>
|
||
</section>
|
||
|
||
|
||
</article>
|
||
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|
||
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||
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