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55 lines
1.8 KiB
Go
55 lines
1.8 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 result
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import (
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"github.com/IBM/fp-go/v2/either"
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M "github.com/IBM/fp-go/v2/monoid"
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)
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// AlternativeMonoid creates a monoid for Either using applicative semantics.
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// The empty value is Right with the monoid's empty value.
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// Combines values using applicative operations.
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//
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// Example:
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//
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// import "github.com/IBM/fp-go/v2/monoid"
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// intAdd := monoid.MakeMonoid(0, func(a, b int) int { return a + b })
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// m := either.AlternativeMonoid[error](intAdd)
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// result := m.Concat(either.Right[error](1), either.Right[error](2))
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// // result is Right(3)
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//
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//go:inline
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func AlternativeMonoid[A any](m M.Monoid[A]) Monoid[A] {
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return either.AlternativeMonoid[error](m)
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}
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// AltMonoid creates a monoid for Either using the Alt operation.
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// The empty value is provided as a lazy computation.
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// When combining, returns the first Right value, or the second if the first is Left.
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//
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// Example:
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//
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// zero := func() either.Result[int] { return either.Left[int](errors.New("empty")) }
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// m := either.AltMonoid[error, int](zero)
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// result := m.Concat(either.Left[int](errors.New("err1")), either.Right[error](42))
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// // result is Right(42)
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//
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//go:inline
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func AltMonoid[A any](zero Lazy[Result[A]]) Monoid[A] {
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return either.AltMonoid(zero)
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}
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