Tree traversal in elixir, pre-order, in-order, post-order What am I doing wrong?

[NobbZ]

A common approach is to use either an atom that represents the empty tree, eg. nil or :empty, or to just use a empty map (%{}).

[OvermindDL1]

@NobbZ

A common approach is to use either an atom that represents the empty tree, eg. nil or :empty , or to just use a empty map ( %{} ).

Usually what I see is either a [] for an empty/nil value and a [something] for a something value, it’s unambiguous and fast in all cases.