     
<div class="comment collapse" id="comment-func-generator-element_-equatable-indexof_"><div class="p">
    <p>Returns the first index where <code>value</code> appears in <code>self</code> or <code>nil</code> if
<code>value</code> is not found.</p>

<p><strong>Complexity:</strong> O(<code>self.count</code>).</p>

    <h4>Declaration</h4>    
    <code class="language-swift">func indexOf(element: Base._Element) -&gt; Base.Index?</code>
    
        <h4>Declared In</h4>
        <a href="../../protocol/Col