Middle+

/** * The function 'asyncAuth(callback)' takes a callback, * which can be passed an error (as the first argument) and * data from the backend (as the second argument). * asyncAuth((error, data) => {}); * * You need to implement the 'auth()' function, * which calls 'asyncAuth()' but returns a Promise. * * @returns {Promise} */ function auth() { return new Promise((resolve, reject) => { asyncAuth((error, data) => { if (error) { reject(error) } else { resolve(data) } }); }) } /** * The 'tryAuth()' function uses 'auth()' and, in case of an error, * makes N additional attempts. * If all attempts fail, it returns the last error. * * @returns {Promise} */ function tryAuth(n) { return new Promise((resolve, reject) => { function attempt(attemptsLeft) { auth().catch((error) => { if (n <= 0) { // Attempts are over — throw the last error return Promise.reject(error); } // There are still attempts — call recursively with n - 1 return tryAuth(n - 1); }); } }) }

sobes.tech AI

Answer from AI

Your tryAuth function is not fully implemented and contains errors. Here is a corrected version that recursively attempts to execute auth() up to N times and returns the result or the last error:

function tryAuth(n) {
  return auth().catch(error => {
    if (n <= 0) {
      return Promise.reject(error);
    }
    return tryAuth(n - 1);
  });
}

Explanation:

First, call auth(), which returns a Promise.
If auth() succeeds, the Promise resolves with the data.
If an error occurs, check if there are remaining attempts (n > 0).
If attempts remain, call tryAuth with a decremented attempt count.
If no attempts remain, propagate the last error.

This approach allows trying to authenticate multiple times in a row until success or attempts are exhausted.

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