dlist: Difference lists

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Difference lists are a list-like type supporting O(1) append. This is particularly useful for efficient logging and pretty printing (e.g. with the Writer monad), where list append quickly becomes too expensive.


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Versions 0.2, 0.3, 0.3.1, 0.3.2, 0.4, 0.4.1, 0.5, 0.6, 0.6.0.1, 0.7, 0.7.0.1, 0.7.1, 0.7.1.1, 0.7.1.2, 0.8, 0.8.0.1, 0.8.0.2, 0.8.0.3, 0.8.0.4, 0.8.0.5
Change log ChangeLog.md
Dependencies base (==4.*), deepseq (>=1.1 && <2) [details]
License BSD-3-Clause
Copyright 2006-2009 Don Stewart, 2013-2016 Sean Leather
Author Don Stewart
Maintainer Sean Leather <sean.leather@gmail.com>
Category Data
Home page https://github.com/spl/dlist
Bug tracker https://github.com/spl/dlist/issues
Source repo head: git clone git://github.com/spl/dlist.git
Uploaded by SeanLeather at Thu Sep 13 07:03:09 UTC 2018
Distributions Arch:0.8.0.5, Debian:0.8.0.4, Fedora:0.8.0.4, FreeBSD:0.7.1.1, LTSHaskell:0.8.0.5, NixOS:0.8.0.5, Stackage:0.8.0.5, openSUSE:0.8.0.5
Downloads 344059 total (466 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2018-09-13 [all 1 reports]
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Readme for dlist-0.8.0.5

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Difference Lists in Haskell

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Summary

The Haskell dlist package defines a list-like type supporting O(1) append and snoc operations.

See ChangeLog.md for recent changes.

References

Research

  1. A novel representation of lists and its application to the function “reverse.” John Hughes. Information Processing Letters. Volume 22, Issue 3. 1986-03. Pages 141-144. [PDF]

    This is the original source for a representation of lists as first-class functions.

Basic Introduction

  1. Difference list. Wikipedia.

  2. Difference lists. Haskell.org Wiki.

  3. What is a DList?. Stack Overflow.

Blogs and Discussion

  1. Using Difference Lists. Douglas M. Auclair. 2008-08-13.

  2. A Sort of Difference. Edward Kmett. 2008-09-18.

  3. Reference for technique wanted. Richard O'Keefe, et al. 2010-10-31.

  4. 24 Days of Hackage: dlist. Oliver Charles. 2012-12-14.

  5. Constructing a list in a Monad. Joachim Breitner. 2013-11-13.

  6. Demystifying DList. (On Reddit). Tom Ellis. 2014-01-24.

  7. keepEquals with Difference Lists, Douglas M. Auclair. 2014-06-21.

Books

  1. Chapter 13. Data Structures. Real World Haskell. 2008-12-05.