Update value of a key in nested map/list

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2 
my_data = %{"TopKey" => [
               %{"StringKey" => "foo"},
               %{"StringKey" => "bar"}
             ]
           }
all = fn :get_and_update, data, next ->
  Enum.map(data, next) |> :lists.unzip
end
IO.inspect get_and_update_in(my_data, ["TopKey", all, "StringKey"], &{&1, String.upcase &1})

{["foo", "bar"], %{"TopKey" => [%{"StringKey" => "FOO"}, %{"StringKey" => "BAR"}]}}

From Kernel.get_and_update_in/3

my_data = %{"TopKey" => [
               %{"StringKey" => "foo"},
               %{"StringKey" => "bar"}
             ]
           }
IO.inspect (update_in my_data, ["TopKey", Access.all(), "StringKey"], &String.upcase/1)

%{"TopKey" => [%{"StringKey" => "FOO"}, %{"StringKey" => "BAR"}]}

From Access behaviour

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