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| author | Chris Martin <ch.martin@gmail.com> | 2016-04-10 18:55:45 +0200 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2016-04-10 20:09:03 +0200 |
| commit | 90d66dedc3a2d9b03dfd3dc3314d380e2adcf2ea (patch) | |
| tree | ee072de893f7929253fe5644b05bb76fc1d9fec2 /libraries/base | |
| parent | c4a7520ef3a0b5e0e33d66ae1d628af93e0d7590 (diff) | |
| download | haskell-90d66dedc3a2d9b03dfd3dc3314d380e2adcf2ea.tar.gz | |
Add doc to (<=<) comparing its type to (.)
This is another documentation addition similar to D1989, this time
comparing the type of the Kleisli composition operator (<=<) to that
of plain function composition (.).
Reviewers: hvr, austin, bgamari
Reviewed By: bgamari
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D2100
Diffstat (limited to 'libraries/base')
| -rw-r--r-- | libraries/base/Control/Monad.hs | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/libraries/base/Control/Monad.hs b/libraries/base/Control/Monad.hs index 9d858bd332..a964581fef 100644 --- a/libraries/base/Control/Monad.hs +++ b/libraries/base/Control/Monad.hs @@ -104,7 +104,12 @@ infixr 1 <=<, >=> (>=>) :: Monad m => (a -> m b) -> (b -> m c) -> (a -> m c) f >=> g = \x -> f x >>= g --- | Right-to-left Kleisli composition of monads. @('>=>')@, with the arguments flipped +-- | Right-to-left Kleisli composition of monads. @('>=>')@, with the arguments flipped. +-- +-- Note how this operator resembles function composition @('.')@: +-- +-- > (.) :: (b -> c) -> (a -> b) -> a -> c +-- > (<=<) :: Monad m => (b -> m c) -> (a -> m b) -> a -> m c (<=<) :: Monad m => (b -> m c) -> (a -> m b) -> (a -> m c) (<=<) = flip (>=>) |