This function is introduced in the following blog post and helps with optimizing Haskell code:
It has the following defintion:
etaReaderT :: ReaderT r m a -> ReaderT r m a
etaReaderT = ReaderT . oneShot . runReaderT
It can be used if the code like on the snippet below is called in a loop multiple times:
step :: Instr -> ReaderT Config IO Result
step e = case e of
Add -> do stuff …
Del -> do stuff …You just do:
step :: Instr -> ReaderT Config IO Result
step e = etaReaderT $ case e of
Add -> … do stuff …
Del -> … do stuff …
This function is introduced in the following blog post and helps with optimizing Haskell code:
It has the following defintion:
It can be used if the code like on the snippet below is called in a loop multiple times:
You just do: