Skip to content

Unfoldable1 support #29

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

Merged
garyb merged 1 commit into from
May 13, 2018
Merged

Unfoldable1 support #29

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
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
3 changes: 2 additions & 1 deletion bower.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,8 @@
],
"dependencies": {
"purescript-foldable-traversable": "^3.4.0",
"purescript-prelude": "^3.0.0"
"purescript-prelude": "^3.0.0",
"purescript-unfoldable": "^3.2.0"
},
"devDependencies": {
"purescript-assert": "^3.0.0",
Expand Down
6 changes: 6 additions & 0 deletions src/Data/NonEmpty.purs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,9 @@ import Data.Ord (class Ord1, compare1)
import Data.Semigroup.Foldable as F1
import Data.Traversable (class Traversable, traverse, sequence)
import Data.TraversableWithIndex (class TraversableWithIndex, traverseWithIndex)
import Data.Tuple (uncurry)
import Data.Unfoldable (class Unfoldable, unfoldr)
import Data.Unfoldable1 (class Unfoldable1)

-- | A non-empty container of elements of type a.
-- |
Expand Down Expand Up @@ -122,3 +125,6 @@ instance traversableWithIndexNonEmpty
instance foldable1NonEmpty :: Foldable f => F1.Foldable1 (NonEmpty f) where
fold1 = foldMap1 id
foldMap1 f (a :| fa) = foldl (\s a1 -> s <> f a1) (f a) fa

instance unfoldable1NonEmpty :: Unfoldable f => Unfoldable1 (NonEmpty f) where
unfoldr1 f b = uncurry (:|) $ unfoldr (map f) <$> f b
2 changes: 2 additions & 0 deletions test/Main.purs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ import Control.Monad.Eff (Eff)
import Data.Foldable (fold, foldl)
import Data.Maybe (Maybe(..))
import Data.NonEmpty (NonEmpty(), (:|), fold1, foldl1, oneOf, head, tail, singleton)
import Data.Unfoldable1 as U1
import Test.Assert (ASSERT, assert)

type AtLeastTwo f a = NonEmpty (NonEmpty f) a
Expand All @@ -23,3 +24,4 @@ main = do
assert $ fold ("Hello" :| [" ", "World"]) == "Hello World"
assert $ oneOf (0 :| Nothing) == oneOf (0 :| Just 1)
assert $ second (1 :| 2 :| [3, 4]) == 2
assert $ U1.range 0 9 == (0 :| [1, 2, 3, 4, 5, 6, 7, 8, 9])