analytics-scripts

(function() {
    var observer = new IntersectionObserver(function(entries) {
        if(entries[0].isIntersecting === true) {
            // your work here...
        }
        //... same for all elemensts if there are more than one. or just check with cycle
        //threshold from 0 - just became visible to 1 - fully visible
    }, { threshold: [0.5] });

    observer.observe(/*elements to observe*/);

analytics-scripts

const getHashVar = hash_var =>
    location.hash.includes(hash_var + '=') ? location.hash.split(hash_var + '=')[1].replace(/&.*/g, "") : "";

analytics-scripts

function mapDOM(element, json) {
    var treeObject = {};

    // If string convert to document Node
    if (typeof element === "string") {
        if (window.DOMParser) {
              parser = new DOMParser();
              docNode = parser.parseFromString(element,"text/xml");
        } else { // Microsoft strikes again
              docNode = new ActiveXObject("Microsoft.XMLDOM");

analytics-scripts

const parseCookie = str =>
    str ? str
        .split(';')
        .map(v => v.split('='))
        .reduce((acc, v) => {
            acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());
            return acc;
        }, {}) : "";