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Add Do notation support and Bind to Monads (#100)

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* fix: implement bind, let, apS for serveral monads

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

* fix: implement bind for maps

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

* fix: implement do notation for more monads

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

* fix: add bind to more monads

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

* fix: add Do and Bind support to Monads

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>

---------

Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
This commit is contained in:
Carsten Leue
2024-01-31 21:34:46 +01:00
committed by GitHub
parent c73467caf5
commit 7d3759619c
77 changed files with 3665 additions and 174 deletions
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18
writer/writer.go
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@@ -16,23 +16,35 @@
package writer
import (
EM "github.com/IBM/fp-go/endomorphism"
IO "github.com/IBM/fp-go/io"
M "github.com/IBM/fp-go/monoid"
S "github.com/IBM/fp-go/semigroup"
T "github.com/IBM/fp-go/tuple"
G "github.com/IBM/fp-go/writer/generic"
)
type Writer[W, A any] func() T.Tuple2[A, W]
type Writer[W, A any] IO.IO[T.Tuple2[A, W]]
func Of[A, W any](m M.Monoid[W]) func(A) Writer[W, A] {
return G.Of[Writer[W, A]](m)
}
// Listen modifies the result to include the changes to the accumulator
func Listen[W, A any](fa Writer[W, A]) Writer[W, T.Tuple2[A, W]] {
return G.Listen[Writer[W, A], Writer[W, T.Tuple2[A, W]], W, A](fa)
}
// Pass applies the returned function to the accumulator
func Pass[W, A any](fa Writer[W, T.Tuple2[A, EM.Endomorphism[W]]]) Writer[W, A] {
return G.Pass[Writer[W, T.Tuple2[A, EM.Endomorphism[W]]], Writer[W, A]](fa)
}
func MonadMap[FCT ~func(A) B, W, A, B any](fa Writer[W, A], f FCT) Writer[W, B] {
return G.MonadMap[Writer[W, B], Writer[W, A]](fa, f)
}
func Map[FCT ~func(A) B, W, A, B any](f FCT) func(Writer[W, A]) Writer[W, B] {
func Map[W any, FCT ~func(A) B, A, B any](f FCT) func(Writer[W, A]) Writer[W, B] {
return G.Map[Writer[W, B], Writer[W, A]](f)
}
@@ -64,10 +76,12 @@ func Flatten[W, A any](s S.Semigroup[W]) func(Writer[W, Writer[W, A]]) Writer[W,
return G.Flatten[Writer[W, Writer[W, A]], Writer[W, A]](s)
}
// Execute extracts the accumulator
func Execute[W, A any](fa Writer[W, A]) W {
return G.Execute(fa)
}
// Evaluate extracts the value
func Evaluate[W, A any](fa Writer[W, A]) A {
return G.Evaluate(fa)
}