convert jquery toggleclass code to pure javascript code

convert jquery toggleclass code to pure javascript code

Im looking for a way to convert this jquery code (which is used in
responsive menu section) to pure javascript code.
if its hard to implement its ok to use other javascript frameworks.
$('.btn-navbar').click(function()
{
$('.container-fluid:first').toggleClass('menu-hidden');
$('#menu').toggleClass('hidden-phone');
if (typeof masonryGallery != 'undefined')
masonryGallery();
});
thanks in advance