Question: Use Scala define a companion object for the Tree data type, with the following functions: (a) Three polymorphic functions -- inOrder, preOrder, and postOrder --

Use Scala

define a companion object for the Tree data type, with the following functions:

(a) Three polymorphic functions -- inOrder, preOrder, and postOrder -- to traverse the tree in-order, pre-order, and post-order. Each function takes a tree and returns a list with the contents of the tree when traversed in that order.

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