| Portability | MPTCs, Rank2Types, LiberalTypeSynonyms |
|---|---|
| Stability | provisional |
| Maintainer | Edward Kmett <ekmett@gmail.com> |
| Safe Haskell | Safe-Infered |
Data.Array.Lens
Description
Indexing
ix :: (IArray a e, Ix i) => i -> Simple Lens (a i e) eSource
Access an element of an array.
Note: The indexed element is assumed to exist in the target array.
arr ! i = arr^.ix i arr // [(i,e)] = ix i ^= e $ arr
ghci> ix 2 ^= 9 $ listArray (1,5) [4,5,6,7,8] array (1,5) [4,9,6,7,8]
Setters
amapped :: (IArray a c, IArray a d, Ix i) => Setter (a i c) (a i d) c dSource
This setter can be used to map over all of the values in an array.
Note: traverseArray is strictly more general and permits more operations
amap = adjust amapped amapped = sets amap
ixmapped :: (IArray a e, Ix i, Ix j) => (i, i) -> Setter (a j e) (a i e) i jSource
This setter can be used to derive a new array from an old array by applying a function to each of the indices.
ixmap = adjust . ixmapped ixmapped = sets . ixmap