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map-exts: Extensions to Data.Map

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Extensions to Data.Map

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Versions 0.1.0.0, 0.1.0.1, 0.1.0.1, 0.1.1.0, 0.2.0.0
Change log CHANGELOG.md
Dependencies base (>=4.7 && <5), bytestring, cassava, containers (>=0.5 && <0.6) [details]
License BSD-3-Clause
Copyright 2016 Elsen, Inc
Author Charles Cooper
Maintainer cooper.charles.m@gmail.com
Category Data Structures
Home page http://github.com/elsen-trading/map-extensions#readme
Source repo head: git clone https://github.com/elsen-trading/map-extensions
Uploaded by coopercm at 2016-04-16T16:32:52Z

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Readme for map-exts-0.1.0.1

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map-extensions

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.