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66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
// Copyright (c) 2023 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 match
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import (
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"fmt"
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E "github.com/IBM/fp-go/either"
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"github.com/IBM/fp-go/errors"
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F "github.com/IBM/fp-go/function"
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O "github.com/IBM/fp-go/option"
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S "github.com/IBM/fp-go/string"
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)
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type Thing struct {
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Name string
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}
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func (t Thing) GetName() string {
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return t.Name
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}
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var (
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// func(Thing) Either[error, string]
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getName = F.Flow2(
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Thing.GetName,
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E.FromPredicate(S.IsNonEmpty, errors.OnSome[string]("value [%s] is empty")),
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)
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// func(option.Option[Thing]) Either[error, string]
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GetName = F.Flow2(
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E.FromOption[Thing](errors.OnNone("value is none")),
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E.Chain(getName),
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)
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)
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func ExampleEither_match() {
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oThing := O.Of(Thing{"Carsten"})
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res := F.Pipe2(
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oThing,
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GetName,
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E.Fold(S.Format[error]("failed with error %v"), S.Format[string]("get value %s")),
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)
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fmt.Println(res)
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// Output:
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// get value Carsten
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}
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