I wish there was a Map.filter_values function that would filter on keys or
values, but leave the other one intact. This seems like something that
should be in the standard library.
Example implementation of a Map.filter_values that would filter a map based
on its values, leaving the keys intact:
@doc """
Filter map based on its values, leaving the corresponding keys intact.
"""
@spec map_filter_values(Map.t, (any -> boolean)) :: Map.t
def map_filter_values(map, func) do
map |> Enum.filter(fn {_, val} -> func.(val) end) |> Map.new
end
A corresponding Map.filter_keys would also be nice.
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