Comments (3)
The main reason to consider favoring Twan's approach and the reason that I did so originally was that it gave you immedate access to the 'next' instruction at the root. If you left associate to Ørjan's version then you have to walk under /n/ Ap
nodes to figure out what you're doing next. With Twan's you can see the 'next' instruction in /O(1)/ when walking left to right, which is most common. Of course, not everything works left to right like a parser or pretty printer, but a lot of things do
from free.
Sounds fair. I'll update the article with this consideration.
I'm not too concerned about which implementation ends up in the free package — it's not a big deal to copy&paste those 15 lines when I need them.
from free.
Based on my work on Kleene Stores, I eventually settled on the Applicative instance using flip
as the "forward" version and the one with compose was "backwards". This is in part corroborated by the fact that using the compose version with the Backwards
applicative is not as lazy as using the flip
version directly. Assuming the Free Applicative is analogous to Kleene Store, then I'd argue that Twan's version is the natural direction.
from free.
Related Issues (20)
- Missing free 5 migration guide HOT 2
- Metadata revisions for 4.8 and 4.8.0.1 HOT 2
- free-5 doesn't build on old GHCs with transformers-0.4 HOT 3
- Fails with GHC-7.8.4 and installed transformers HOT 9
- Failure building free 5.0.2 with GHC 8.4.2 cross to iOS
- 'Ap' from 'Control.Applicative.Free' conflicts with 'Ap' in base-4.12
- ComonadTraced instance for CofreeT
- Add a MonadBaseControl instance for CofreeT HOT 6
- Simplify the applicative instance of Free HOT 2
- Deriving Via for several datatypes HOT 1
- Comonad f => MonadFree f (Tagged f) HOT 1
- Nu-based distributive cofree
- Add a class for free monad transformer-type things.
- Document 'Control.Monad.Free.Ap' has to work only on "commutative" monads
- Why does hoistFree have such a strict type? HOT 2
- deriving (Applicative, Monad) via GenericFreeMonad "Pure" (Free f)
- Support transformers-0.6 HOT 3
- Further simplify instances to avoid overkill *1 classes
- Dangling Links HOT 2
- `hoistFree` should be named `transFree`
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from free.