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This is also one of my favorites, but it can get even more verbose. However this is how the go type system is designed to work with covariance. Without the `~` operator these funct…

1) I would argue that with fp style you might want to structure your code into small, pure functions, anyway, for testability reasons. Also many functions from the go library are a…

Because in some cases the aspect whether or not the language is functional is not the only decision criteria for the choice of language. If it was, I would absolutely recommend to …

Unfortunately there is no way to use variadic arguments in a type safe way in go (yet) - except for the special case that all arguments are of the same type. This is why some of th…

The example actually does handle all errors, because the values are of type `Either` and the composition functions take this into account. If you would like to handle a particular …

I agree that the code will become unreadable as soon as you try to use inline functions (since there are no lambda expressions). However, the fp style (independent of this library)…

One of the design aspects is to make a distinction between functions with and without side effects (pure). In a way to tell these apart by looking at the function signature without…

There exist at least some examples as part of the go docs, e.g. here https://pkg.go.dev/github.com/IBM/fp-go/either#pkg-examples or https://pkg.go.dev/github.com/IBM/fp-go@v1.0.19/…