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59 lines
1.7 KiB
Go
59 lines
1.7 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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"fmt"
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"github.com/IBM/fp-go/v2/errors"
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)
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func Example_creation() {
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// Build an Either
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leftValue, leftErr := Left[string](fmt.Errorf("some error"))
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rightValue, rightErr := Right("value")
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// Build from a value
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fromNillable := FromNillable[string](fmt.Errorf("value was nil"))
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leftFromNil, nilErr := fromNillable(nil)
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value := "value"
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rightFromPointer, ptrErr := fromNillable(&value)
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// some predicate
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isEven := func(num int) bool {
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return num%2 == 0
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}
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fromEven := FromPredicate(isEven, errors.OnSome[int]("%d is an odd number"))
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leftFromPred, predErrOdd := fromEven(3)
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rightFromPred, predErrEven := fromEven(4)
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fmt.Println(ToString(leftValue, leftErr))
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fmt.Println(ToString(rightValue, rightErr))
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fmt.Println(ToString(leftFromNil, nilErr))
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fmt.Println(IsRight(rightFromPointer, ptrErr))
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fmt.Println(ToString(leftFromPred, predErrOdd))
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fmt.Println(ToString(rightFromPred, predErrEven))
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// Output:
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// Left(some error)
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// Right[string](value)
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// Left(value was nil)
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// true
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// Left(3 is an odd number)
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// Right[int](4)
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}
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