HH\Lib\Keyset\map
Returns a new keyset where each value is the result of calling the given function on the original value
namespace HH\Lib\Keyset;
function map<Tv1, Tv2 as arraykey>(
Traversable<Tv1> $traversable,
(function(Tv1): Tv2) $value_func,
): keyset<Tv2>;
Time complexity: O(n * f), where f is the complexity of $value_func
Space complexity: O(n)
Parameters
Traversable<Tv1>
$traversable
(function(Tv1): Tv2) $value_func
Returns
keyset<Tv2>