Promise.all

Implement your own version of Promise.all that takes an array of promises and returns a single Promise.

Requirements:

• Return a Promise that resolves when all input promises resolve
• The resolved value should be an array of all resolved values in order
• If any promise rejects, immediately reject with that error
• Handle empty array (should resolve immediately with empty array)

Example:

const p1 = Promise.resolve(3);
const p2 = Promise.resolve(42);
const p3 = new Promise(resolve => setTimeout(() => resolve('foo'), 100));

promiseAll([p1, p2, p3]).then(values => {
  console.log(values); // [3, 42, 'foo']
});