Toggle class in vanilla JS

toggle.js

// This is a general function that removes one class and adds another
function toggleClass(target, addedClass) {
    // If target is an element rather than a list, it is converted to array form
    if (!NodeList.prototype.isPrototypeOf(target)) {
        target = [target];
    }

    // Allows for multiple elements to be toggled, such as by using the querySelectorAll() method
    [].forEach.call(target, (element) => {
        if (element.classList.contains(addedClass)) {
            element.classList.remove(addedClass);
        } else {
            element.classList.add(addedClass);
        }
    });
};