JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>
        <article>
             <div class="player"></div>
        </article>
    </li>
    <li>
        <article>
             <div class="player currentPlayer"></div>
        </article>
    </li>
    <li>
        <article>
             <div class="player"></div>
        </article>
    </li>
</ul>

JavaScript

var aa = ["a", "b"];

$(function() {
    
    alert(aa.inArray("a"));
    
});