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fp-go/v2/identity/identity.go
Dr. Carsten Leue aa5e908810 fix: introduce Kleisli type
Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
2025-11-07 14:35:46 +01:00

75 lines
1.8 KiB
Go

// Copyright (c) 2023 - 2025 IBM Corp.
// All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package identity
import (
"github.com/IBM/fp-go/v2/function"
"github.com/IBM/fp-go/v2/internal/chain"
"github.com/IBM/fp-go/v2/internal/functor"
)
func MonadAp[B, A any](fab func(A) B, fa A) B {
return fab(fa)
}
func Ap[B, A any](fa A) Operator[func(A) B, B] {
return function.Bind2nd(MonadAp[B, A], fa)
}
func MonadMap[A, B any](fa A, f func(A) B) B {
return f(fa)
}
func Map[A, B any](f func(A) B) Operator[A, B] {
return f
}
func MonadMapTo[A, B any](_ A, b B) B {
return b
}
func MapTo[A, B any](b B) func(A) B {
return function.Constant1[A](b)
}
func Of[A any](a A) A {
return a
}
func MonadChain[A, B any](ma A, f Kleisli[A, B]) B {
return f(ma)
}
func Chain[A, B any](f Kleisli[A, B]) Operator[A, B] {
return f
}
func MonadChainFirst[A, B any](fa A, f Kleisli[A, B]) A {
return chain.MonadChainFirst(MonadChain[A, A], MonadMap[B, A], fa, f)
}
func ChainFirst[A, B any](f Kleisli[A, B]) Operator[A, A] {
return chain.ChainFirst(Chain[A, A], Map[B, A], f)
}
func MonadFlap[B, A any](fab func(A) B, a A) B {
return functor.MonadFlap(MonadMap[func(A) B, B], fab, a)
}
func Flap[B, A any](a A) Operator[func(A) B, B] {
return functor.Flap(Map[func(A) B, B], a)
}