| Copyright | (c) 2018-2020 Kowainik |
|---|---|
| License | MIT |
| Maintainer | Kowainik <xrom.xkov@gmail.com> |
| Stability | Experimental |
| Portability | Portable |
| Safe Haskell | Safe |
| Language | Haskell2010 |
Relude.Extra.Foldable
Description
Contains utility functions for working with tuples.
Since: 0.6.0.0
Documentation
foldlSC :: forall t b a. Foldable t => (b -> a -> Either b b) -> b -> t a -> b Source #
A left-associative fold that's tail-recursive but can still short-circuit.
Returning a Left short-circuits and immediately returns the value inside.
Returning a Right continues the fold as usual with the value inside.
>>>foldlSC (\acc x -> if x == 0 then Left 0 else Right $! acc * x) 1 [1..6]720>>>foldlSC (\acc x -> if x == 0 then Left 0 else Right $! acc * x) 1 (0:error "Short-circuiting should keep this from happening")0
Since: 0.6.0.0