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99 lines
3.1 KiB
Go
99 lines
3.1 KiB
Go
// Copyright (c) 2023 - 2025 IBM Corp.
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// All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package stateless
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import (
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G "github.com/IBM/fp-go/v2/iterator/stateless/generic"
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)
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// Bind creates an empty context of type [S] to be used with the [Bind] operation
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func Do[S any](
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empty S,
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) Iterator[S] {
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return G.Do[Iterator[S]](empty)
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}
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// Bind attaches the result of a computation to a context [S1] to produce a context [S2]
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func Bind[S1, S2, T any](
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setter func(T) func(S1) S2,
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f func(S1) Iterator[T],
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) func(Iterator[S1]) Iterator[S2] {
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return G.Bind[Iterator[S1], Iterator[S2], Iterator[T], S1, S2, T](setter, f)
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}
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// Let attaches the result of a computation to a context [S1] to produce a context [S2]
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func Let[S1, S2, T any](
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setter func(T) func(S1) S2,
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f func(S1) T,
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) func(Iterator[S1]) Iterator[S2] {
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return G.Let[Iterator[S1], Iterator[S2], S1, S2, T](setter, f)
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}
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// LetTo attaches the a value to a context [S1] to produce a context [S2]
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func LetTo[S1, S2, T any](
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setter func(T) func(S1) S2,
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b T,
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) func(Iterator[S1]) Iterator[S2] {
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return G.LetTo[Iterator[S1], Iterator[S2], S1, S2, T](setter, b)
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}
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// BindTo initializes a new state [S1] from a value [T]
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func BindTo[S1, T any](
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setter func(T) S1,
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) func(Iterator[T]) Iterator[S1] {
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return G.BindTo[Iterator[S1], Iterator[T], S1, T](setter)
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}
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// ApS attaches a value to a context [S1] to produce a context [S2] by considering
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// the context and the value concurrently (using Applicative rather than Monad).
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// This allows independent computations to be combined without one depending on the result of the other.
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//
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// Unlike Bind, which sequences operations, ApS can be used when operations are independent
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// and can conceptually run in parallel.
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//
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// Example:
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//
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// type State struct {
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// X int
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// Y int
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// }
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//
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// // These operations are independent and can be combined with ApS
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// xValues := stateless.Of(1, 2, 3)
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// yValues := stateless.Of(10, 20)
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//
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// result := F.Pipe2(
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// stateless.Do(State{}),
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// stateless.ApS(
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// func(x int) func(State) State {
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// return func(s State) State { s.X = x; return s }
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// },
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// xValues,
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// ),
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// stateless.ApS(
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// func(y int) func(State) State {
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// return func(s State) State { s.Y = y; return s }
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// },
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// yValues,
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// ),
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// ) // Produces all combinations: {1,10}, {1,20}, {2,10}, {2,20}, {3,10}, {3,20}
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func ApS[S1, S2, T any](
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setter func(T) func(S1) S2,
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fa Iterator[T],
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) func(Iterator[S1]) Iterator[S2] {
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return G.ApS[Iterator[func(T) S2], Iterator[S1], Iterator[S2], Iterator[T], S1, S2, T](setter, fa)
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}
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