HH\Lib\Keyset\union
Requires the Hack Standard Library to be installed.
Facebook Engineer?
This function is available as Keyset\union() in Facebook's www repository.
Returns a new keyset containing all of the elements of the given Traversables
namespace HH\Lib\Keyset;
function union<Tv as arraykey>(
Traversable<Tv> $first,
Container<Tv> ...$rest,
): keyset<Tv>;
For a variable number of Traversables, see Keyset\flatten().
Time complexity: O(n + m), where n is the size of $first and m is the
combined size of all the ...$rest
Space complexity: O(n + m), where n is the size of $first and m is the
combined size of all the ...$rest
Parameters
Returns
keyset<Tv>