HH\Lib\C\firstx_async
Requires the Hack Standard Library to be installed.
Facebook Engineer?
This function is available as C\gen_firstx() in Facebook's www repository.
Returns the first element of the result of the given Awaitable, or throws if the Traversable is empty
namespace HH\Lib\C;
function firstx_async<T>(
Awaitable<Traversable<T>> $awaitable,
): Awaitable<T>;
For non-Awaitable Traversables, see C\firstx.
Time complexity: O(1) Space complexity: O(1)