JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>link 1</li>
    <li>link 2</li>
    <li>link 3</li>
</ul>

JavaScript

$(document).ready(function() {
    var menu = new Array();
    $('ul').children().each(function() {
        menu.push($(this));
        $(this).click(function(e) {
            for (x = 0; x < menu.length; x++) {
                if ($(menu[x]).text() == $(this).text()) {
                    $(menu[x]).css('font-weight','bold');
                } else {
                    $(menu[x]).css('font-weight','normal');
                }
            }
        });
    });
})