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fix: add match example

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Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
This commit is contained in:
Dr. Carsten Leue
2023-09-24 22:15:01 +02:00
parent 7b82e87bf3
commit 7ef6eb524b
5 changed files with 75 additions and 10 deletions
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6
either/either.go
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@@ -92,11 +92,11 @@ func MonadChainTo[E, A, B any](ma Either[E, A], mb Either[E, B]) Either[E, B] {
}
func MonadChainOptionK[A, B, E any](onNone func() E, ma Either[E, A], f func(A) O.Option[B]) Either[E, B] {
return MonadChain(ma, F.Flow2(f, FromOption[E, B](onNone)))
return MonadChain(ma, F.Flow2(f, FromOption[B](onNone)))
}
func ChainOptionK[A, B, E any](onNone func() E) func(func(A) O.Option[B]) func(Either[E, A]) Either[E, B] {
from := FromOption[E, B](onNone)
from := FromOption[B](onNone)
return func(f func(A) O.Option[B]) func(Either[E, A]) Either[E, B] {
return Chain(F.Flow2(f, from))
}
@@ -142,7 +142,7 @@ func Sequence3[E, T1, T2, T3, R any](f func(T1, T2, T3) Either[E, R]) func(Eithe
}
}
func FromOption[E, A any](onNone func() E) func(O.Option[A]) Either[E, A] {
func FromOption[A, E any](onNone func() E) func(O.Option[A]) Either[E, A] {
return O.Fold(F.Nullary2(onNone, Left[A, E]), Right[E, A])
}

4
either/either_test.go
View File

@@ -112,6 +112,6 @@ func TestChainOptionK(t *testing.T) {
}
func TestFromOption(t *testing.T) {
assert.Equal(t, Left[int]("none"), FromOption[string, int](F.Constant("none"))(O.None[int]()))
assert.Equal(t, Right[string](1), FromOption[string, int](F.Constant("none"))(O.Some(1)))
assert.Equal(t, Left[int]("none"), FromOption[int](F.Constant("none"))(O.None[int]()))
assert.Equal(t, Right[string](1), FromOption[int](F.Constant("none"))(O.Some(1)))
}