s="p">
    <p>Returns an array containing the results of mapping the given closure
over the sequence&#39;s elements.</p>

<p>In this example, <code>map</code> is used first to convert the names in the array to
lowercase strings and then to count their characters.</p>

<pre><code class="language-swift">let cast = [&quot;Vivien&quot;, &quot;Marlon&quot;, &quot;Kim&quot;, &quot;Karl&quot;]
let lowercaseNames = cast.map { $0.lowercaseString }
// &#39;lowercaseNames&#39; == [&quot;vivien&quot;, &quot;marlon&quot