#424 Promise.allSettled

Implement a polyfill function promiseAllSettled that works like Promise.allSettled.

Requirements

• Accepts an array of promises (or values).

• Returns a promise that resolves once all input promises have settled.

• The result should be an array of objects with:

  • { status: "fulfilled", value: ... } if the promise resolved.
  • { status: "rejected", reason: ... } if the promise rejected.

• Order of results must match the order of the input promises.

• Must not short-circuit on rejection (unlike Promise.all).

Example

const promises = [
  Promise.resolve(1),
  Promise.reject('fail'),
  42
];

promiseAllSettled(promises).then(console.log);

// Output:
// [
//   { status: "fulfilled", value: 1 },
//   { status: "rejected", reason: "fail" },
//   { status: "fulfilled", value: 42 }
// ]

Constraints

• Do not use Promise.allSettled directly.
• Must handle non-promise values correctly (treat them as fulfilled).