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const getBaseURL = url => url.replace(/[?#].*$/, '');
getBaseURL('http://url.com/page?name=Adam&surname=Smith');// 'http://url.com/page'

const isAbsoluteURL = str => /^[a-z][a-z0-9+.-]*:/.test(str);
isAbsoluteURL('https://google.com'); // trueisAbsoluteURL('ftp://www.myserver.net'); // trueisAbsoluteURL('/foo/bar'); // false

const getURLParameters = url =>  (url.match(/([^?=&]+)(=([^&]*))/g) || []).reduce(    (a, v) => (      (a[v.slice(0, v.indexOf('='))] = v.slice(v.indexOf('=') + 1)), a    ),    {}  );
getURLParameters('google.com'); // {}getURLParameters('http://url.com/page?name=Adam&surname=Smith');// {name: 'Adam', surname: 'Smith'}

const elementContains = (parent, child) =>  parent !== child && parent.contains(child);
elementContains(  document.querySelector('head'),  document.querySelector('title'));// trueelementContains(document.querySelector('body'), document.querySelector('body'));

const getAncestors = el => {  let ancestors = [];  while (el) {    ancestors.unshift(el);    el = el.parentNode;  }  return ancestors;};
getAncestors(document.querySelector('nav'));// [document, html, body, header, nav]

const smoothScroll = element =>  document.querySelector(element).scrollIntoView({    behavior: 'smooth'  });
smoothScroll('#fooBar'); // scrolls smoothly to the element with the id fooBarsmoothScroll('.fooBar');// scrolls smoothly to the first element with a class of fooBar

const onClickOutside = (element, callback) => {  document.addEventListener('click', e => {    if (!element.contains(e.target)) callback();  });};
onClickOutside('#my-element', () => console.log('Hello'));// Will log 'Hello' whenever the user clicks outside of #my-element

const UUIDGeneratorBrowser = () =>  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>    (      c ^      (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))    ).toString(16)  );
UUIDGeneratorBrowser(); // '7982fcfe-5721-4632-bede-6000885be57d'

const getSelectedText = () => window.getSelection().toString();
getSelectedText(); // 'Lorem ipsum'

const copyToClipboard = str => {  if (navigator && navigator.clipboard && navigator.clipboard.writeText)    return navigator.clipboard.writeText(str);  return Promise.reject('The Clipboard API is not available.');};

const addStyles = (el, styles) => Object.assign(el.style, styles);
addStyles(document.getElementById('my-element'), {  background: 'red',  color: '#ffff00',  fontSize: '3rem'});

const fullscreen = (mode = true, el = 'body') =>  mode    ? document.querySelector(el).requestFullscreen()    : document.exitFullscreen();
fullscreen(); // Opens `body` in fullscreen modefullscreen(false); // Exits fullscreen mode

<form>  <label for="username">Username:</label>  <input id="username" name="username">
  <label for="password">Password:</label>  <input id="password" name="password" type="password">  <span id="password-message" style="display: none">Caps Lock is on</span></form>

const el = document.getElementById('password');const msg = document.getElementById('password-message');
el.addEventListener('keyup', e => {  msg.style = e.getModifierState('CapsLock')    ? 'display: block'    : 'display: none';});

const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());
isDateValid('December 17, 1995 03:24:00'); // trueisDateValid('1995-12-17T03:24:00'); // trueisDateValid('1995-12-17 T03:24:00'); // falseisDateValid('Duck'); // falseisDateValid(1995, 11, 17); // trueisDateValid(1995, 11, 17, 'Duck'); // falseisDateValid({}); // false

const getColonTimeFromDate = date => date.toTimeString().slice(0, 8);
getColonTimeFromDate(new Date()); // '08:38:00'

const detectLanguage = (defaultLang = 'en-US') =>  navigator.language ||  (Array.isArray(navigator.languages) && navigator.languages[0]) ||  defaultLang;
detectLanguage(); // 'nl-NL'

const prefersDarkColorScheme = () =>  window &&  window.matchMedia &&  window.matchMedia('(prefers-color-scheme: dark)').matches;
prefersDarkColorScheme(); // true

const supportsTouchEvents = () =>  window && 'ontouchstart' in window;
supportsTouchEvents(); // true

const url = new URL("https://example.com/login?user=someguy&page=news");
url.origin// "https://example.com"url.host// "example.com"url.protocol// "https:"url.pathname// "/login"url.searchParams.get('user')// "someguy"