Skip to content

add unwrapF and unF #15

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 7 commits into
base: master
Choose a base branch
from
Open

add unwrapF and unF #15

Changes from all commits
Commits
Show all changes
7 commits
Select commit Hold shift + click to select a range
df9ef6d
update package.json deps
safareli Feb 12, 2018
fe029d5
add unwrapF and unF
safareli Feb 12, 2018
927a2f6
remove functor constraint
safareli Jun 20, 2018
42e4a18
Merge branch 'master' into unwrapF
safareli Jun 20, 2018
a0c474f
Add Functor constraint back
safareli Apr 30, 2019
da4aa81
Merge branch 'master' into unwrapF
JordanMartinez Sep 22, 2021
b387adc
Add functor class import
thomashoneyman Sep 22, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 10 additions & 0 deletions src/Data/Newtype.purs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
module Data.Newtype where

import Data.Functor (class Functor)
import Data.Monoid.Additive (Additive(..))
import Data.Monoid.Conj (Conj(..))
import Data.Monoid.Disj (Disj(..))
Expand Down Expand Up @@ -56,6 +57,15 @@ instance newtypeLast :: Newtype (Last a) a
un :: forall t a. Newtype t a => (a -> t) -> t -> a
un _ = unwrap

-- | Cheap version of `map unwrap`.
unwrapF :: forall f t a. Functor f => Newtype t a => f t -> f a
unwrapF = coerce

-- | Given a constructor for a `Newtype`, this returns the appropriate `unwrapF`
-- | function.
unF :: forall f t a. Functor f => Newtype t a => (a -> t) -> f t -> f a
unF _ = unwrapF

-- | This combinator is for when you have a higher order function that you want
-- | to use in the context of some newtype - `foldMap` being a common example:
-- |
Expand Down