mirror of
https://github.com/IBM/fp-go.git
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88 lines
2.2 KiB
Go
88 lines
2.2 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 ioresult
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import (
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"fmt"
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E "github.com/IBM/fp-go/v2/either"
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)
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func ExampleIOResult_creation() {
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// Build an IOResult
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leftValue := Left[string](fmt.Errorf("some error"))
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rightValue := Right("value")
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// Convert from Either
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eitherValue := E.Of[error](42)
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ioFromEither := FromEither(eitherValue)
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// some predicate
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isEven := func(num int) (int, error) {
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if num%2 == 0 {
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return num, nil
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}
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return 0, fmt.Errorf("%d is an odd number", num)
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}
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fromEven := Eitherize1(isEven)
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leftFromPred := fromEven(3)
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rightFromPred := fromEven(4)
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// Convert results to Either for display
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val1, err1 := leftValue()
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if err1 != nil {
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fmt.Printf("Left[*errors.errorString](%s)\n", err1.Error())
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} else {
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fmt.Printf("Right[string](%s)\n", val1)
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}
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val2, err2 := rightValue()
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if err2 != nil {
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fmt.Printf("Left[*errors.errorString](%s)\n", err2.Error())
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} else {
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fmt.Printf("Right[string](%s)\n", val2)
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}
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val3, err3 := ioFromEither()
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if err3 != nil {
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fmt.Printf("Left[*errors.errorString](%s)\n", err3.Error())
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} else {
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fmt.Printf("Right[int](%d)\n", val3)
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}
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val4, err4 := leftFromPred()
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if err4 != nil {
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fmt.Printf("Left[*errors.errorString](%s)\n", err4.Error())
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} else {
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fmt.Printf("Right[int](%d)\n", val4)
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}
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val5, err5 := rightFromPred()
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if err5 != nil {
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fmt.Printf("Left[*errors.errorString](%s)\n", err5.Error())
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} else {
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fmt.Printf("Right[int](%d)\n", val5)
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}
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// Output:
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// Left[*errors.errorString](some error)
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// Right[string](value)
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// Right[int](42)
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// Left[*errors.errorString](3 is an odd number)
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// Right[int](4)
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}
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