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The tree-traversals package defines in-order, pre-order, post-order, level-order, and reversed level-order traversals for tree-like types:
inorder, preorder, postorder, levelorder, rlevelorder :: (TreeLike tree, Applicative f) => (a -> f b) -> tree a -> f (tree b)
The package also provides newtype wrappers for the various traversals so they
may be used with
traverse f (InOrder tree) = inorder f tree traverse f (PreOrder tree) = preorder f tree traverse f (PostOrder tree) = postorder f tree traverse f (LevelOrder tree) = levelorder f tree traverse f (RLevelOrder tree) = rlevelorder f tree
To implement the various orders, the tree-traversals package provides the
Phases applicative transformer for organizing effects into distinct phases.
TreeLike are provided for rose trees (
Data.Tree), binary trees (
BinaryTree from this package's
Data.BinaryTree), forests (
Forest from this package's
and algebraic combinations of trees (
Compose outerTree innerTree,
Product fstTree sndTree,
Sum leftTree rightTree).