On click add class via core JS

Question

How should I transfer this code in CORE JS file so no jQuery at all :

$('#menu-icon-trigger').click(function () {
    $('menu-icon').toggleClass('is-clicked');
});

Answer 1

One way to replicate jquery toggle class into JS is as follows:

function controlClass() {

    document.querySelector('menu-icon').classList.toggle('is-clicked');

}

document.querySelector('#menu-icon-trigger').addEventListener('click', controlClass);