reducers

Semigroups, specialized containers and a general map/reduce framework

http://github.com/ekmett/reducers/

Version on this page:3.12.4@rev:6
LTS Haskell 24.24:3.12.5@rev:1
Stackage Nightly 2025-12-18:3.12.5@rev:1
Latest on Hackage:3.12.5@rev:1

See all snapshots reducers appears in

BSD-3-Clause licensed by Edward A. Kmett
Maintained by Edward A. Kmett
This version can be pinned in stack with:reducers-3.12.4@sha256:2bb029cacf13a9d53fc74def7958d45b44cd0113189c533df20bfda4cf36880a,2587

Module documentation for 3.12.4

  • Data
    • Data.Generator
      • Data.Generator.Combinators
    • Data.Semigroup
      • Data.Semigroup.Alt
      • Data.Semigroup.Alternative
      • Data.Semigroup.Applicative
      • Data.Semigroup.Apply
      • Data.Semigroup.Generator
      • Data.Semigroup.Instances
      • Data.Semigroup.Monad
      • Data.Semigroup.MonadPlus
      • Data.Semigroup.Reducer
        • Data.Semigroup.Reducer.With
      • Data.Semigroup.Self
      • Data.Semigroup.Union
Used by 2 packages in nightly-2024-01-10(full list with versions):
tdigest, trifecta

reducers

Hackage Build Status

This package provides a number of semigroup-based containers and reductions.

Contact Information

Contributions and bug reports are welcome!

Please feel free to contact me through github or on the #haskell IRC channel on irc.freenode.net.

-Edward Kmett

Changes

3.12.4 [2021.11.01]

  • Allow building with GHC 9.2.
  • Allow building with transformers-0.6.*.

3.12.3 [2018.07.03]

  • Fix some RULES warnings.
  • Allow building with containers-0.6.

3.12.2

  • Fix the build with fingertree-0.1.2 or later. Since fingertree-0.1.2 now provides a Semigroup instance for FingerTree, as a result Data.Semigroup.Instances no longer exports anything if building against fingertree-0.1.2 or later with base-4.9 or later.
  • Removed a couple of redundant instance constraints
  • GHC 8 compatibility
  • transformers 0.5 compatibility

3.12.1

  • Restored support for semigroups < 0.17.

3.12

  • semigroups 0.17 support

3.11

  • Fixed the name of the field accessor for Ap
  • semigroupoids 5 support
  • Builds without warnings on GHC 7.10

3.10

  • Updated dependencies

3.0.2.1

  • Updated array dependency for compatibility with GHC 7.8

3.0.2

  • Claim to be Trustworthy

3.0.1

  • Removed the upper bounds on my other package dependencies