Different behavior between List.flatten() and Enum/Stream.flat_map()

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10

that’s why its called differently.

flat_map is very handy when you map over something and you get results that you just want to omit.

> Enum.flat_map([1,2,3,4,5], fn n -> if rem(n,2)==0, do: [n], else: [] end)
[2, 4]