String URI Comparison.js

const urlParser = url => {
  const parser = document.createElement('a');
  parser.href = url;
  return parser;
};

const compareSearchParams = (p1, p2) => {
  const urlParams1 = new URLSearchParams(p1);
  const urlParams2 = new URLSearchParams(p2);
  var keys1 = urlParams1.keys();
  var keys2 = urlParams2.keys();
  for(key of keys1) { 
    const eq = urlParams1.has(key) && urlParams2.has(key) && (urlParams1.get(key) === urlParams2.get(key));
    if (!eq) {
      return false;
    }
  }
  for(key of keys2) { 
    const eq = urlParams1.has(key) && urlParams2.has(key) && (urlParams1.get(key) === urlParams2.get(key));
    if (!eq) {
      return false;
    }
  }
  return true;
  
};
if (String.prototype.isSameURL === undefined) {
  String.prototype.isSameURL = function (url) {
    const pUrl1 = urlParser(this);
    const pUrl2 = urlParser(url);

   if (pUrl1.username !== pUrl2.username || pUrl1.password !== pUrl2.password) {
     console.log('auth');
     return false;
   } else if (pUrl1.origin !== pUrl2.origin) {
     console.log('origin');
     return false;
   } else if (pUrl1.pathname !== pUrl2.pathname) {
     console.log('pathname');
     return false;
   } else if (!compareSearchParams(pUrl1.search, pUrl2.search)) {
     console.log('query');
     return false
   } else if (pUrl1.hash !== pUrl2.hash) {
     console.log('hash');
     return false;
   }
   return true;
 }
}


const url1 = 'http://ABC:cd@example.com/go/~down/foo.html/?a=~1&c=1&b=2#hash';
const url2 = 'http://ABC:cd@EXAMPLE.com:80/go/further/%7Edown/foo.html/?b=2&a=%7E1&c=1#hash';

const isEqual = url1.isSameURL(url2);
console.log(isEqual);