An Either type for golang with generics
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
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 resultMIT