HH\Lib\Dict\from_keys_async
Requires the Hack Standard Library to be installed.
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This function is available as Dict\gen_from_keys() in Facebook's www repository.
Returns a new dict where each value is the result of calling the given async function on the corresponding key
namespace HH\Lib\Dict;
function from_keys_async<Tk as arraykey, Tv>(
Traversable<Tk> $keys,
(function(Tk): Awaitable<Tv>) $async_func,
): Awaitable<dict<Tk, Tv>>;
For non-async functions, see Dict\from_keys().
Time complexity: O(n * f), where f is the complexity of $async_func
Space complexity: O(n)
Parameters
Traversable<Tk> $keys(function(Tk): Awaitable<Tv>) $async_func