HF|Promise.allSettled()

https://bigfrontend.dev/zh/problem/implement-Promise-allSettled

/**
 * @param {Array<any>} promises - notice that input might contains non-promises
 * @return {Promise<Array<{status: 'fulfilled', value: any} | {status: 'rejected', reason: any}>>}
 */
function allSettled(promises) {
  // your code here
  const n = promises.length;
  let ans = [];
  let count = 0;
  return new Promise((resolve) => {
    if (n == 0) resolve([]);
    for (let i = 0; i < n; i++) {
      Promise.resolve(promises[i])
        .then((value) => {
          ans[i] = {
            status: 'fulfilled',
            value,
          };
          if (++count == n) resolve(ans);
        })
        .catch((reason) => {
          ans[i] = {
            status: 'rejected',
            reason,
          };
          if (++count == n) resolve(ans);
        })
    }
  })
}