JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>
<button>slideToggle</button>

CSS

div {
    width: 50px;
    height: 50px;
    background: blue;
    border: 2px solid;
}

JavaScript

$('button').click(function() {
    $('div').slideToggle(function() {
        console.log( $(this).is(':visible') );
    });
});