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Refactor functors and related packages #17

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Merged
thomashoneyman merged 1 commit into from
Feb 4, 2021
Merged

Refactor functors and related packages #17

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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -14,6 +14,7 @@ Bugfixes:
Other improvements:
- Migrated CI to GitHub Actions and updated installation instructions to use Spago (#14)
- Added a CHANGELOG.md file and pull request template (#15, #16)
- This package now depends on the `purescript-tuples` and `purescript-type-equality` packages, and contains an instance previously in `purescript-tuples` (#17)

## [v4.0.0](https://github.com/purescript/purescript-distributive/releases/tag/v4.0.0) - 2018-05-23

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4 changes: 3 additions & 1 deletion bower.json
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Expand Up @@ -23,6 +23,8 @@
"dependencies": {
"purescript-identity": "master",
"purescript-newtype": "master",
"purescript-prelude": "master"
"purescript-prelude": "master",
"purescript-tuples": "master",
"purescript-type-equality": "master"
}
}
6 changes: 6 additions & 0 deletions src/Data/Distributive.purs
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Expand Up @@ -4,6 +4,8 @@ import Prelude

import Data.Identity (Identity(..))
import Data.Newtype (unwrap)
import Data.Tuple (Tuple(..), snd)
import Type.Equality (class TypeEquals, from)

-- | Categorical dual of `Traversable`:
-- |
Expand Down Expand Up @@ -31,6 +33,10 @@ instance distributiveFunction :: Distributive ((->) e) where
distribute a e = map (_ $ e) a
collect f = distribute <<< map f

instance distributiveTuple :: TypeEquals a Unit => Distributive (Tuple a) where
collect = collectDefault
distribute = Tuple (from unit) <<< map snd

-- | A default implementation of `distribute`, based on `collect`.
distributeDefault
:: forall a f g
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