Update value in map based on Enum.member? check

[JupiterIO1]

The solution was solved in another topic:

Update a map that is outside scope of an iterator

map_A = Enum.reduce(map_A, %{}, fn {k, v}, out -> if Enum.member?(Map.keys(map_B), x) == true) do Map.put(out, k, “yes”) else Map.put(out, k, “no”) end end) You need to remember that whatever way you do it you need to assign the output of the function to your variable.