# Cookbook/Compilers and interpreters

### From HaskellWiki

< Cookbook(Difference between revisions)

(→GHCi) |
(→GHCi) |
||

Line 14: | Line 14: | ||

| :i | | :i | ||

|<haskell> | |<haskell> | ||

− | Prelude> :i | + | Prelude> :i Monad |

− | + | 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 | ||

+ | -- Defined in GHC.Base | ||

instance Monad Maybe -- Defined in Data.Maybe | instance Monad Maybe -- Defined in Data.Maybe | ||

− | instance | + | instance Monad IO -- Defined in GHC.IOBase |

− | instance ( | + | instance Monad ((->) r) -- Defined in Control.Monad.Instances |

− | + | instance Monad [] -- Defined in GHC.Base | |

− | instance | + | |

</haskell> | </haskell> | ||

|- | |- |

## Revision as of 08:28, 31 August 2009

## 1 GHC

TODO

## 2 GHCi

Problem | Solution | Examples |
---|---|---|

checking definitions | :i | Prelude> :i Monad 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 -- Defined in GHC.Base instance Monad Maybe -- Defined in Data.Maybe instance Monad IO -- Defined in GHC.IOBase instance Monad ((->) r) -- Defined in Control.Monad.Instances instance Monad [] -- Defined in GHC.Base |

checking types | :t | Prelude> :t "Hello" "Hello" :: [Char] |

## 3 Hugs

TODO