This module contains some extensions to Data.Map. Some of them are convenience functions.
It also contains functions to support a split-apply-combine workflow, by representing labeled, multi-dimensional data as multiply nested Maps. For instance, a two dimensional matrix with one axis indexed by 'Name's and the other axis labeled by 'Job's, we would represent such a structure with a Lookup2 Name Job Double. Such a structure is not terribly efficient (it takes O(n log(n)) space and O(log(n)) time for insert/update/delete operations with high constant factor owing to all the pointer manipulation), but it is expressive.
Here is the rough correspondence between split-apply-combine and the verbs used in this package:
split : groupBy
apply : fmap
combine : foldr/foldMap
reshape : transpose
For more information, see the examples.