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This is available as Vec\map_with_key in the www repository.

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

namespace HH\Lib\Vec;

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

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



  • vec<Tv2>