JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="menu">
    <li class="active"><a href="#" id="parent-one">One</a></li>
    <li><a href="#" id="parent-two">Two</a></li>
    <li><a href="#" id="parent-three">Three</a></li>
    <li><a href="#" id="parent-four">Four</a></li>
</ul>

JavaScript

$('li').each(function (i, el) {
         var li = $(this);
         if($(this).hasClass('active')) {
               console.log('find');
         }
    });