samber
Either: Add Map helper function
Hi @CorentinClabaut
Why do you need a mo.Map() helper, instead of mo.Either[A, B].Match() ?
It is to be able to map the either to a different type.
That's why I added an helper function instead of a new method.
This helper would be helpful for cases like this:
type Authentification struct { mo.Either[BearerToken, BasicAuth] }
func (a Authentification) GetHeader() string {
mo.Map(a,
func(token BearerToken) string { return BuildBearerAuthHeader(string(token)) },
func(cred BasicAuth) string { return BuildBasicAuthHeader(cred.Username, cred.Password)} })
So far what we can do is:
type Authentification struct { mo.Either[BearerToken, BasicAuth] }
func (a Authentification) GetHeader() string {
if a.IsLeft() {
return BuildBearerAuthHeader(string(a.MustLeft()))
} else {
basicAuth := a.MustRight()
return BuildBasicAuthHeader(basicAuth.Username, basicAuth.Password)}
}
}
Which is less readable, more error prone.
Hi @CorentinClabaut and sorry for the late reply.
I wonder if we could build a proper implementation of monads, with Applicative, Foldable, Traversable...
We must be able to run a Map() on any data structure of this repository.
Any idea how to do that? 🤔
I can't think of a way of doing it with a single function.
What about creating multiple functions MapOption, MapResult, MapEitherX ?