list-duplicate: Group and delete duplicates from a list

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Dependencies base (>=4.7 && <5) [details]
License BSD-3-Clause
Copyright 2020 Preetham Gujjula
Author Preetham Gujjula
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Uploaded by pgujjula at 2020-05-02T22:04:39Z
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Readme for list-duplicate-

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list-duplicate is a library for working with duplicates in lists.


list-duplicate is a new project, but the following features have been implemented and extensively tested:

  • group, groupBy: Group duplicate elements
  • groupAdj, groupAdj: Group duplicate adjacent elements in a list. Also useful for grouping the elements of a sorted list.
  • deleteDups, deleteDupsBy: Delete duplicates from a list.
  • deleteAdjDups, deleteAdjDupsBy: Delete adjacent duplicates from a list. Also useful for deleting duplicates from a sorted list.

Full documentation can be built with Haddock (see instructions below), and is also available on Hackage.


Build and install with Stack:

git clone
cd list-utilities/list-duplicate
stack build list-duplicate           # build the project
stack haddock list-duplicate --open  # build and view documentation
stack test                           # run the test suite


If you want to report a bug, request a feature, or suggest improvements, feel free to email me at preetham (dot) gujjula (at) protonmail (dot) com!

-- Preetham