Concurrency Limit

Execute promises with a maximum concurrency limit.

Requirements:

• Implement promisePool that takes array of async functions and limit
• Execute at most limit promises concurrently
• When a promise completes, start the next one from the queue
• Return all results in original order

Example:

const tasks = [
  async () => 1,
  async () => 2,
  async () => 3,
  async () => 4
];

promisePool(tasks, 2).then(results => {
  console.log(results); // [1, 2, 3, 4]
});