Auto-highlight the current main- and subcategory on Tesco Online website's main menu

tesco_online_menu_highlighter.js

const $fe = function(selector, callable){[].forEach.call(document.querySelectorAll(selector),callable);};
const $fei = function(selector, callable, interval){setInterval(function(){$fe(selector, callable);}, interval);};
const breadcumbSelector = '.beans-breadcrumb__list-item a[href] span.beans-link__text';
$fei(
  breadcumbSelector, function(spanLinkItem){
    const parentHref = spanLinkItem.parentElement.getAttribute('href');
    const finalHref = parentHref.slice(0,-4) + "?include-children=true";
    const finalSelector = `li.menu__item a[href='${finalHref}']`;
    const formatClass = 'bandi-highlight';
    const item = document.querySelector(finalSelector);
    if(item){item.parentElement.classList.add(formatClass);}
  }, 
  50
);