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Add extra functions #25

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merged 2 commits into from
Sep 13, 2020
Merged

Add extra functions #25

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2392557
Add extra functions
th-awake Sep 12, 2020
a243354
Update These.purs
thomashoneyman Sep 13, 2020
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21 changes: 20 additions & 1 deletion src/Data/These.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ import Control.Extend (class Extend)
import Data.Bifunctor (class Bifunctor)
import Data.Bitraversable (class Bitraversable, class Bifoldable, bitraverse)
import Data.Functor.Invariant (class Invariant, imapF)
import Data.Maybe (Maybe(..))
import Data.Maybe (Maybe(..), isJust)
import Data.Traversable (class Traversable, class Foldable, foldMap, foldl, foldr)
import Data.Tuple (Tuple(..))

Expand Down Expand Up @@ -147,3 +147,22 @@ that :: forall a b. These a b -> Maybe b
that = case _ of
That x -> Just x
_ -> Nothing

-- | Returns the `a` and `b` values if and only if they are constructed
-- | with `Both`.
both :: forall a b. These a b -> Maybe (Tuple a b)
both = case _ of
Both a x -> Just (Tuple a x)
_ -> Nothing

-- | Returns `true` when the `These` value is `This`
isThis :: forall a b. These a b -> Boolean
isThis = isJust <<< this

-- | Returns `true` when the `These` value is `That`
isThat :: forall a b. These a b -> Boolean
isThat = isJust <<< that

-- | Returns `true` when the `These` value is `Both`
isBoth :: forall a b. These a b -> Boolean
isBoth = isJust <<< both