flux-monoid: A monoid for tracking changes

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A monoid which counts changing values in a sequence

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- Monoid
  - Data.Monoid.Flux

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flux-monoid-1.0.0.0.tar.gz [browse] (Cabal source package)
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Versions [RSS]	0.1.0.0, 0.1.0.1, 0.1.0.2, 1.0.0.0
Dependencies	base (>=4.7 && <5) [details]
License	BSD-3-Clause
Copyright	2018 Chris Penner
Author	Chris Penner
Maintainer	Chris Penner
Category	Data Structures
Home page	https://github.com/ChrisPenner/flux-monoid#readme
Source repo	head: git clone https://github.com/ChrisPenner/flux-monoid
Uploaded	by ChrisPenner at 2025-08-13T02:17:54Z
Distributions	NixOS:1.0.0.0
Reverse Dependencies	1 direct, 0 indirect [details]
Downloads	889 total (5 in the last 30 days)
Rating	(no votes yet) [estimated by Bayesian average]
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Status	Docs available [build log] Last success reported on 2025-08-13 [all 1 reports]

Readme for flux-monoid-1.0.0.0

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flux-monoid

Flux is a monoid which counts the number of times an element changes (according to its Eq instance) This is useful for gaining associativity (and its associated performance improvements) for tasks where you'd otherwise use group or groupBy

It also allows usage of change-detection semantics in situations where a Monoid is required; e.g. in a FingerTree

> getFlux $ foldMap flux ["a", "b", "b", "a"]
2
> getFlux $ foldMap flux ["a", "b", "b", "a", "c", "c", "c"]
3