promiseCache.js

let cache;
const TTL = 1500;
const callApi = () => {
  return new Promise((res, rej) => res('1234'))
}
async function getData() {
  if (cache) return cache;
  try {
    const newProm = await callApi();
    console.log('get new result', newProm);
    cache = newProm;
    setTimeout(() => {
      cache = undefined;
      console.log('resetting cache', cache)
    }, TTL)
  } catch (err) {
    console.log('caught error', err)
    cache = undefined;
  }
  // const newProm = callApi();
  // newProm
  //   .then((result) => {
  //     console.log('get new result', result);
  //     setTimeout(() => {
  //       cache = undefined;
  //       console.log('resetting cache')
  //     }, TTL)
  //     return result;
  //   })
  //   .catch((err) => {
  //     console.log('caught error', err);
  //     cache = undefined;
  //   })
  // cache = newProm;
  return cache;
}


(async () => {
  setInterval(async () => {
    const data = await getData();
    console.log('get data', data)
  }, 500)
})()