https://github.com/leavez/go-either

An Either type for golang with generics
https://github.com/leavez/go-either

Last synced: about 1 month ago
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An Either type for golang with generics

• Host: GitHub
• URL: https://github.com/leavez/go-either
• Owner: leavez
• License: mit
• Created: 2022-04-08T12:51:18.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2022-04-08T13:52:58.000Z (over 2 years ago)
• Last Synced: 2024-06-20T02:04:33.966Z (5 months ago)
• Language: Go
• Size: 2.93 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: LICENSE

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README

        
# go-either

An Either type for golang with generics

```golang

e := either.NewLeft[int, string](1) // either.Type[int, string]

l, r, isLeft := e.Unwrap()

if isLeft {  // true

  print(l)   // l is 1

} else {

  print(r)

}

e.EitherDo(func(l int) {

  print(l)

}, func(r string) {

  print(r)

})

either.MapLeft(e, func(left int) *int {

  return &left

}) // either.Type[*int, string]

// either.MapRight

// either.Map

```

and the Result type, based on `either.Type`

```golang

r := result.New(123) // result.Type[int]

r.IsError() // false

if w, err := r.Unwrap(); err != nil {

  print(w) // 123

}

result.Map(r, func(t int) string {

  return "123"

}) // result.Type[string]

r.MapError(func(err error) error {

  return fmt.Errorf("faile: %w", err)

}) // equals r, as MapError will only execute when r is error result

```

# License

MIT