Requires the Hack Standard Library to be installed.
Facebook Engineer?

This function is available as Dict\map() in Facebook's www repository.

Returns a new dict where each value is the result of calling the given function on the original value

namespace HH\Lib\Dict;

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

To use an async function, see Dict\map_async().

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



  • dict<Tk, Tv2>