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fix: order of parameters on Ap

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Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
This commit is contained in:
Dr. Carsten Leue
2023-07-14 13:20:00 +02:00
parent e42d399509
commit e350f70659
31 changed files with 373 additions and 231 deletions
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17
either/core.go
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@@ -1,9 +1,11 @@
package either
import "fmt"
import (
"fmt"
)
// Either defines a data structure that logically holds either an E or an A. The flag discriminates the cases
type (
// Either defines a data structure that logically holds either an E or an A. The flag discriminates the cases
Either[E, A any] struct {
isLeft bool
left E
@@ -29,30 +31,35 @@ func (s Either[E, A]) Format(f fmt.State, c rune) {
}
}
// IsLeft tests if the either is a left value. Rather use [Fold] if you need to access the values. Inverse is [IsRight].
func IsLeft[E, A any](val Either[E, A]) bool {
return val.isLeft
}
// IsLeft tests if the either is a right value. Rather use [Fold] if you need to access the values. Inverse is [IsLeft].
func IsRight[E, A any](val Either[E, A]) bool {
return !val.isLeft
}
func Left[E, A any](value E) Either[E, A] {
// Left creates a new instance of an [Either] representing the left value.
func Left[A, E any](value E) Either[E, A] {
return Either[E, A]{isLeft: true, left: value}
}
// Right creates a new instance of an [Either] representing the right value.
func Right[E, A any](value A) Either[E, A] {
return Either[E, A]{isLeft: false, right: value}
}
// MonadFold extracts the values from an [Either] by invoking the [onLeft] callback or the [onRight] callback depending on the case
func MonadFold[E, A, B any](ma Either[E, A], onLeft func(e E) B, onRight func(a A) B) B {
if IsLeft(ma) {
if ma.isLeft {
return onLeft(ma.left)
}
return onRight(ma.right)
}
// Unwrap converts an Either into the idiomatic tuple
// Unwrap converts an [Either] into the idiomatic tuple
func Unwrap[E, A any](ma Either[E, A]) (A, E) {
return ma.right, ma.left
}