dogs

Make Go functional with dogs

Caution

This is a highly-experimental package. Any changes will be made in a backward-incompatible manner.

This package will not compile without gotip since type parameters are not supported currently in any of Go releases.

Probably you don't need this even after type parameters becomes GA. Even if you feel you do, maybe you shouldn't use this. It's against Go's philosophy.

Features

We will continue to implement more utility types and functions.

Type classes

• Eq
• Ord
• Semigroup
• Monoid

Data types

• Pair
• List
• Slice
• Map
• Set
• Iterator

Examples

More examples here.

FizzBuzz

func main() {
    monoid := option.DeriveMonoid[string](algebra.DeriveAdditiveSemigroup[string]())
    fizzBuzz := func(i int) string {
        fizz := option.Filter(option.Some[string]("Fizz"), func(_ string) bool { return i%3 == 0 })
        buzz := option.Filter(option.Some[string]("Buzz"), func(_ string) bool { return i%5 == 0 })
        return option.UnwrapOr(monoid.Combine(fizz, buzz), fmt.Sprint(i))
    }
    it := iterator.Map(iterator.Range[int](1, 15), fizzBuzz)
    iterator.ForEach(it, func(s string) { fmt.Println(s) })
}

Fibonacci

func main() {
    type Pair = pair.Pair[int, int]
    it := iterator.Unfold(
        Pair{1, 1},
        func(p Pair) (Pair, int, bool) {
            a, b := p.Values()
            return Pair{b, a + b}, a, true
        },
    )
    iterator.ForEach(
        iterator.Take(it, 5),
        func(i int) { fmt.Println(i) },
    )
}

Acknowledgements

This library is inspired mainly by:

• Haskell standard library
• Scala Cats

and many other functional languages.

License

Distributed under the Apache License, Version 2.0. See LICENSE for more information.