lens-4.3: Lenses, Folds and Traversals

PortabilityMTPCs
Stabilityprovisional
MaintainerEdward Kmett <ekmett@gmail.com>
Safe HaskellSafe-Inferred

Data.Tree.Lens

Description

 

Synopsis

Documentation

root :: Lens' (Tree a) aSource

A Lens that focuses on the root of a Tree. 

>>> view root $ Node 42 []
42

branches :: Lens' (Tree a) [Tree a]Source

A Lens returning the direct descendants of the root of a Tree 

view branches ≡ subForest