lens-3.7.3: Lenses, Folds and Traversals

PortabilityMTPCs
Stabilityprovisional
MaintainerEdward Kmett <[email protected]>
Safe HaskellNone

Data.Tree.Lens

Description

 

Synopsis

Documentation

root :: SimpleLens (Tree a) aSource

A Lens that focuses on the root of a Tree. 

>>> view root $ Node 42 []
42

branches :: SimpleLens (Tree a) [Tree a]Source

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

view branches ≡ subForest