JSFiddle - React, Tailwind, and code Playground

HTML

Show Favorite Numbers: <input id="ShowFaveNumbers" type="checkbox">
 
<ul id="FaveNumbers">
    <li>5</li>
    <li>2</li>
    <li>0</li>
</ul>

JavaScript

$(function() {
 
        function showOrHide() {
            var isChecked = $('#ShowFaveNumbers').is(':checked');
 
            var fn = $('#FaveNumbers');
            if (isChecked)
                fn.show();
            else
                fn.hide();
        }
 
 
        $('#ShowFaveNumbers').change(function() {
            showOrHide();
        });
 
        showOrHide();
 
});