Learning Functional Programming in Go

The idiomatic parts

We have a typical if err != nil error check at the end of our pipeline:

if err != nil {   Error.Error(err)} else {   carJson = json.(string)}

This is where we should perform error checking, so having an error check is natural.

We could choose to implement an Either monad to wrap our response in a struct that might look like this:

type Either struct {   Value interface{}   Error error}

We could include a sum or union type which would return only either Success() or Failure():

type SuccessOrFailure interface {   Success() bool   Failure() bool}

Then we would have to create another interface to convert our Either to a Success or a Failure. It might look something like this:

type Either interface {   SuccessOrFailure Succeeded() StringOption ...