createUrl.js

// curring fuction;
// mix of closure;
function createUrl(baseUrl, protocol = 'https') {
  // we can have some other process here
	return function (path) {
  	return `${protocol}://${baseUrl}/${path}`;
  }
}

const createClubUrl = createUrl('club.0-1.ir');
const createSamfonyUrl= createUrl('samfonyIp', 'http');

const samfonyLoginUrl = createSamfonyUrl('action=login');
const samfonyGetTempsUrl = createSamfonyUrl('action=getTemp');

const clubPointUrl = createClubUrl('mypoints');

fetchWithTimeout.js

function fetchWithTimeout(url, options, timeout = 0) {
  return Promise.race([
    fetch(url, options),
    new Promise((_, reject) => {
      if (timeout > 0) {
        return setTimeout(() => reject(new Error('TimeoutError')), timeout);
      }
    }),
  ]);
}