Fugue

Documentation

module Prelude

module Control.Applicative

module Control.Arrow

module Control.Category

module Control.Monad

module Data.Either

module Data.Foldable

module Data.Functor

module Data.Maybe

module Data.Monoid

module Data.Traversable

module System.Environment

module System.Exit

module Text.Printf

class IsString a where

Class for string-like datastructures; used by the overloaded string extension (-foverloaded-strings in GHC).

Methods

fromString :: String -> a

Instances

IsString [Char]

on :: (b -> b -> c) -> (a -> b) -> a -> a -> c

(*) `on` f = \x y -> f x * f y.

Typical usage: sortBy (compare `on` fst).

Algebraic properties:

• (*) `on` id = (*) (if (*) ∉ {⊥, const ⊥})

• ((*) `on` f) `on` g = (*) `on` (f . g)

• flip on f . flip on g = flip on (g . f)