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bind.go
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bind.go
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// Copyright (c) 2023 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 option
import (
A "github.com/IBM/fp-go/internal/apply"
C "github.com/IBM/fp-go/internal/chain"
F "github.com/IBM/fp-go/internal/functor"
)
// Bind creates an empty context of type [S] to be used with the [Bind] operation
func Do[S any](
empty S,
) Option[S] {
return Of(empty)
}
// Bind attaches the result of a computation to a context [S1] to produce a context [S2]
func Bind[S1, S2, A any](
setter func(A) func(S1) S2,
f func(S1) Option[A],
) func(Option[S1]) Option[S2] {
return C.Bind(
Chain[S1, S2],
Map[A, S2],
setter,
f,
)
}
// Let attaches the result of a computation to a context [S1] to produce a context [S2]
func Let[S1, S2, B any](
key func(B) func(S1) S2,
f func(S1) B,
) func(Option[S1]) Option[S2] {
return F.Let(
Map[S1, S2],
key,
f,
)
}
// LetTo attaches the a value to a context [S1] to produce a context [S2]
func LetTo[S1, S2, B any](
key func(B) func(S1) S2,
b B,
) func(Option[S1]) Option[S2] {
return F.LetTo(
Map[S1, S2],
key,
b,
)
}
// BindTo initializes a new state [S1] from a value [T]
func BindTo[S1, T any](
setter func(T) S1,
) func(Option[T]) Option[S1] {
return C.BindTo(
Map[T, S1],
setter,
)
}
// ApS attaches a value to a context [S1] to produce a context [S2] by considering the context and the value concurrently
func ApS[S1, S2, T any](
setter func(T) func(S1) S2,
fa Option[T],
) func(Option[S1]) Option[S2] {
return A.ApS(
Ap[S2, T],
Map[S1, func(T) S2],
setter,
fa,
)
}