fp-go/v2

Functional programming library for golang V2

Go 1.24 introduces generic type aliases which are leveraged by V2.

⚠️ Breaking Changes

• use of generic type aliases which requires go1.24
• order of generic type arguments adjusted such that types that cannot be inferred by the method argument come first, e.g. in the Ap methods
• monadic operations for Pair operate on the second argument, to be compatible with the Haskell definition

Simplifications

• use type aliases to get rid of namespace imports for type declarations, e.g. instead of

import (
    ET "github.com/IBM/fp-go/v2/either"
)

func doSth() ET.Either[error, string] {
    ...
}

you can declare your type once

import (
    "github.com/IBM/fp-go/v2/either"
)

type Either[A any] = either.Either[error, A]

and then use it across your codebase

func doSth() Either[string] {
    ...
}

• library implementation does no longer need to use the generic subpackage, this simplifies reading and understanding of the code