NOTE: NodeList に NodeList の連結と forEach 処理

Concat nodelists and use forEach method
referred from Stack Overflow

unactivate([...tabs, ...codes]);
activate([tab, code]);

function activate(elms) {
    Array.prototype.forEach.call(elms, function(elm) {
        elm.classList.add(CLASS_NAMES.ACTIVE);
    })
}
function unactivate(elms) {
    Array.prototype.forEach.call(elms, function(elm) {
        elm.classList.remove(CLASS_NAMES.ACTIVE);
    });
}