Returns an Awaitable of Map of ResultOrExceptionWrapper after a filtering operation has been applied to each value in the provided KeyedTraversable

namespace HH\Asio;

function mfw<Tk, T>(
  KeyedTraversable<Tk, T> $inputs,
  (function(T):Awaitable<bool>) $callable,
): Awaitable<Map<Tk, HH\Asio\ResultOrExceptionWrapper<T>>>;

This function is similar to mf(), except the Map in the returned Awaitable contains values of ResultOrExceptionWrapper instead of raw values.

This function is similar to Map::filter(), but the filtering of the values is done using Awaitables.

This function is called mfw because we are returning a map, doing a filtering operation and each value member in the Map is wrapped by a ResultOrExceptionWrapper.

$callable must return an Awaitable of bool.

The ResultOrExceptionWrappers in the Map of the returned Awaitable are not available until you await or join the returned Awaitable.


Return Values