bubunyo / go-result

[Experimental] rust `Result<T,Err>` implementation in Go

go-result Experimental

This is an attempt to implement the rust Result<T, Error> Type in go. This is purely experimental. Do not use it in production.

Use Case

if you define a method ReadFile that returns a Result? eg

func ReadFile(input string) result.Result[[]string] {
	file, err := ioutil.ReadFile(input)
	if err != nil {
		return result.Error[[]string](err)
	}
	fileContent := string(file)
	return result.Ok(strings.Split(fileContent, "\n"))
}

You can read the contents of a file using

for l := range ReadFile("./rick-roll-1").Result() {
  fmt.Println(l)
}

/* 
Output:  

Never gonna give you up
Never gonna let you down
Never gonna run around and desert you
*/

You can also chain results like this

song := ReadFile("./rick-roll-1").
  Then(func(p1 []string) result.Resolver[[]string] {
    return result.Ok(append(p1, ReadFile("./rick-roll-2").Result()...))
  }).Result()


/* 
Output:

Never gonna give you up
Never gonna let you down
Never gonna run around and desert you

Never gonna make you cry
Never gonna say goodbye
Never gonna tell a lie and hurt you
*/