The Other Prelude

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Call for Contribution

This fun project, called "The Other Prelude", and is a creative reconstruction of the standard Prelude. By disregarding history and compatibility, we get a clean sheet.

Naming Conventions

The principal is to make the names very readable for both beginners and category theorists (if any).


  • The prelude should not contain any "projection" functions (like fst and snd. They go to the Extension module.


  • Should alphanumeric names be preferred over symbols when defining a class?

The Hierarchy

  • TheOtherPrelude - Minimalistic module.
  • TheOtherPrelude.Extension - Convenient definitions.

The Code

Currently, the code is in Wiki form. If people do agree that the collaborative decisions begot something pretty, we'll have a group of files in some time.

The imaginery Prelude as it stands,

import Prelude ()    -- hide everything

-- the idea is to remove 'fmap' 
-- and map :: (a -> b) -> [a] -> [b] to be a special case

class Functor f where
  map :: (a -> b) -> f a -> f b

-- should the Functor hierarchy proposal be adopted?
class Monad m where
  (>>=) :: m a -> (a -> m b) -> m b
  (>>) :: m a -> m b -> m b
  return :: a -> m a
  fail :: String -> m a

How to use it, as it stands,

import Prelude ()                            -- hide everything
import TheOtherPrelude                       -- get everything
import qualified TheOtherPrelude.Monad as M  -- standard convention

See Also