Cookbook/Compilers and interpreters: Difference between revisions
< Cookbook
No edit summary |
(→GHCi) |
||
| Line 20: | Line 20: | ||
! Examples | ! Examples | ||
|- | |- | ||
| checking | | checking a definition | ||
| :i | | :i | ||
|<haskell> | |<haskell> | ||
| Line 36: | Line 36: | ||
</haskell> | </haskell> | ||
|- | |- | ||
| checking | | checking a type | ||
| :t | | :t | ||
|<haskell> | |<haskell> | ||
Revision as of 08:35, 31 August 2009
GHC
| Problem | Solution | Examples |
|---|---|---|
| compile a file, but don't link | -c | ghc -c Foo.hs |
GHCi
| Problem | Solution | Examples |
|---|---|---|
| checking a definition | :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 a type | :t | Prelude> :t "Hello"
"Hello" :: [Char]
Prelude> :t length
length :: [a] -> Int |
Hugs
TODO