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fix: add missing MapLeft

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Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
This commit is contained in:
Dr. Carsten Leue
2024-01-15 12:04:55 +01:00
parent f3642bad60
commit a14feff1d6
6 changed files with 42 additions and 5 deletions
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9
either/either.go
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@@ -67,16 +67,17 @@ func MapTo[E, A, B any](b B) func(Either[E, A]) Either[E, B] {
return F.Bind2nd(MonadMapTo[E, A, B], b)
}
func MonadMapLeft[E, A, B any](fa Either[E, A], f func(E) B) Either[B, A] {
return MonadFold(fa, F.Flow2(f, Left[A, B]), Right[B, A])
func MonadMapLeft[E1, A, E2 any](fa Either[E1, A], f func(E1) E2) Either[E2, A] {
return MonadFold(fa, F.Flow2(f, Left[A, E2]), Right[E2, A])
}
func Map[E, A, B any](f func(a A) B) func(fa Either[E, A]) Either[E, B] {
return Chain(F.Flow2(f, Right[E, B]))
}
func MapLeft[E, A, B any](f func(E) B) func(fa Either[E, A]) Either[B, A] {
return F.Bind2nd(MonadMapLeft[E, A, B], f)
// MapLeft applies a mapping function to the error channel
func MapLeft[A, E1, E2 any](f func(E1) E2) func(fa Either[E1, A]) Either[E2, A] {
return F.Bind2nd(MonadMapLeft[E1, A, E2], f)
}
func MonadChain[E, A, B any](fa Either[E, A], f func(a A) Either[E, B]) Either[E, B] {