map-exts: Extensions to Data.Map

[ bsd3, data-structures, library, program ] [ Propose Tags ]
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Dependencies base (>=4.7 && <5), bytestring, cassava, containers (>= && <0.6) [details]
License BSD-3-Clause
Copyright 2016 Elsen, Inc
Author Charles Cooper
Category Data Structures
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Source repo head: git clone
Uploaded by coopercm at Wed Jan 10 00:05:13 UTC 2018
Distributions NixOS:
Executables titanic-example, example
Downloads 506 total (16 in the last 30 days)
Rating 2.0 (votes: 1) [estimated by rule of succession]
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Status Docs available [build log]
Last success reported on 2018-01-10 [all 1 reports]
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Extensions to Data.Map

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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.