lens-3.2: Lenses, Folds and Traversals

PortabilityMTPCs
Stabilityprovisional
MaintainerEdward Kmett <[email protected]>
Safe HaskellSafe-Inferred

Data.Tree.Lens

Description

 

Synopsis

Documentation

root :: Simple Lens (Tree a) aSource

A Lens that focuses on the root of a Tree. 

>>> view root $ Node 42 []
42

branches :: SimpleIndexedTraversal Int (Tree a) (Tree a)Source

A Traversal of the direct descendants of the root of a Tree indexed by its position in the list of children 

toListOf branches ≡ subForest