/**
 * mapAsync makes it possible to map over an array async without having to do the promise.all afterwards
 * 
 * It saves a lot of lines of code, and makes it more readable
 * Example usage:
 * 
 * 
 * ```ts
 * 
 * const myNumbers = [1, 2, 3, 4, 5];
 * 
 * const doubleAsync = (num) => Promise.resolve(num + num);
 * const sqrtAsync = (sum) => Promise.resolve(sum * sum);
 * const halfAsync = (time) => Promise.resolve(time / 2);
 * 
 * const doubleSqrtHalfs = await mapAsync(myNumbers, doubleAsync)
  .then((sums) => mapAsync(sums, sqrtAsync))
  .then((times) => mapAsync(times, halfAsync));
```
 */
export const mapAsync = <T, U>(
  array: T[],
  callback: (value: T, index: number, array: T[]) => Promise<U>
) => {
  const u = Promise.all(array.map(callback));
  return u;
};