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There is a fairly large amount of beginner material available for Haskell. Real World Haskell and Learn You a Haskell each provide a great foundation in the language, and by now the plethora of monad tutorials has become infamous. There are also a great quantity of research papers and blog posts focusing on advanced features of the language.

What's missing is that intermediate stepping stone. Many of the newer language extensions provided by GHC are of practical use on many projects, but knowledge of them is not immediately available. While we have many high performance libraries, it is not always apparent which is the right choice for a specific task.

The goal of this book is to provide that stepping stone. It is intended to be a community-driven effort, consisting of writings by many members of the community. Writing this book is a project which will consist of a few steps:

  1. Brainstorming on what should be covered.

  2. Organizing the content into a consistent outline.

  3. Gathering content from various members of the community.

  4. Reviewing and improving the content: both to improve its technical accuracy, and to make it more accessible to newcomers.

As it stands now, there are no plans to publish this book, though that may become relevant. I suppose one issue we should address is how licensing and book royalties would be worked out. I would recommend that all content have copyright assigned to a central organization (, that it be licensed under a Creative Commons license, and any profit made from it be donated back to


We still need to determine how the book will flow. The breakdown given below is not intended to provide an actual outline of the book, but merely to organize the concepts. It is very likely that we will be introducing language features (e.g., OverloadedStrings) at the same time as we introduce libraries (e.g., text).


  • Exception handling
  • Asynchronous exceptions
  • Basic typeclasses (Monoid, Applicative, Alternative)

Common techniques

  • Monad transformers
    • monad-control
  • CPS

Language extensions

  • OverloadedStrings
  • ViewPatterns
  • PatternGuards
  • TypeFamilies
  • FunDeps
  • MPTC
  • GADT
  • TemplateHaskell
  • QuasiQuotes

Data structures

  • vector
  • containers
  • unordered-containers
  • text
  • bytestring


  • binary/cereal
  • blaze-builder
  • blaze-html
  • attoparsec
  • aeson
  • yaml
  • xml-conduit

Other libraries

  • system-filepath

Open debates

  • Streaming data
    • conduit
    • iteratee/enumerator
    • pipes
  • Typeclasses versus records
  • "Good" use of typeclass extensions
  • Proper error reporting (Either, Maybe, ErrorT)


  • cabal
  • cabal-dev/virthualenv
  • Test framework


  • hlint
  • Debugging
  • Profiling
  • Finding space leaks
  • Strictness annotations
  • Pragmas (UNPACK, INLINE, ...)
  • Heap profiling

Organizational questions

  • Should the book be kept on Github?

  • What format should we use for the content? Markdown, Literate Haskell, LaTeX?

  • Should the book have its own Github organization with lots of committers, or should everyone create their own fork?