HH\Lib\Keyset\map_with_key

Requires the Hack Standard Library to be installed.
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This function is available as Keyset\map_with_key() in Facebook's www repository.

Returns a new keyset where each value is the result of calling the given function on the original key and value

namespace HH\Lib\Keyset;

function map_with_key<Tk, Tv1, Tv2 as arraykey>(
  KeyedTraversable<Tk, Tv1> $traversable,
  (function(Tk, Tv1): Tv2) $value_func,
): keyset<Tv2>;

Time complexity: O(n * f), where f is the complexity of $value_func Space complexity: O(n)

Parameters

Returns

  • keyset<Tv2>