preorder, postorder, foldTree, mapTree for binary trees #57
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preordergets the preorder traversal of a binary search treepostordergets the postorder traversal of a binary search treefoldTreeis an exercise from haskellbook.com that folds/accumulates a binary tree into a valuemapTreemaps a function over each value in a binary tree. Sort of likefmapfor any binary tree.This is the draft of the PR. If it is OK so far, then I will write tests for all these functions to complete the PR.
Suggestions welcome.