# Cookbook/Compilers and interpreters

### From HaskellWiki

< Cookbook(Difference between revisions)

(→GHCi) |
(→GHCi) |
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Prelude> :t "Hello" |
Prelude> :t "Hello" |
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"Hello" :: [Char] |
"Hello" :: [Char] |
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+ | |||

+ | Prelude> :t length |
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+ | length :: [a] -> Int |
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</haskell> |
</haskell> |
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|} |
|} |

## Revision as of 08:29, 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] Prelude> :t length length :: [a] -> Int |

## 3 Hugs

TODO