JSFiddle - React, Tailwind, and code Playground

by gRoberts

HTML

<div id="my_div"></div>

JavaScript

$(function() {
    var colours = ['red', 'blue', 'green'];
    var my_colour = 'orange';
    $('#my_div').removeClass('horizontal vertical').addClass($.inArray(my_colour, colours) === -1  ? 'vertical' : 'horizontal');
});