map-exts: Extensions to Data.Map

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Extensions to Data.Map

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Dependenciesbase (>=4.7 && <5), bytestring, cassava, containers (>=0.5 && < [details]
Copyright2016 Elsen, Inc
AuthorCharles Cooper
CategoryData Structures
Home page
Source repositoryhead: git clone
Executablestitanic-example, example
UploadedTue Jan 9 23:55:07 UTC 2018 by coopercm




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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.