Go2Funk
Go2Funk is a pet project to test Go2 Generics and see how this new feature help us to implement some functional
structures easily.
The idea is to keep this repo as much as possible dependency free.
How to compile
Golang 1.18
has been release with type parameters.
You can now, compile and test your code as usual (go build
, go test
...)
You can also use Docker Dev Environments to develop this project:
- Open Docker Desktop
- Go to Dev Environments view
- Copy/Paste the git repo URL to start working!
Check the configuration of the base image in the .docker/config.json
config file
Build
use go build ./...
or if you
use Goland then configure external tools
Run tests
use go test -v ./...
or if you
use Goland then configure external tools
Usage
Collection types
List
myIntArray := []int{1, 2, 3, 4, 5}
myList := OfSlice[int](myIntArray)
myList = myList.Append(6)
fmt.Println(myList.Length())
var mapper = func (value int) string { return strconv.Itoa(value) }
var evenPredicate = func (value int) bool { return value % 2 == 0 }
myList = MapList[int, string](myList.Filter(evenPredicate), mapper);
For more usage details check tests.
Control types
Option
empytOption := Empty[int]()
someOption := Of[int](10)
fmt.Println(emptyOption.GetOrElse(5)) // Print 5
fmt.Println(someOption.GetOrElse(5)) // Print 10
var evenPredicate = func (value int) bool { return value % 2 == 0 }
fmt.Println(some.Filter(eventPredicate).IsEmpty()) #Print false
var mapper = func (value int) string { return strconv.Itoa(value) }
fmt.Println(MapOption(someOption, mapper)) // Print "10"
For more usage details check tests.
Try
defaultTryError := errors.New("default Try error")
failure := FailureOf[int](defaultTryError)
success := SuccessOf[int](10)
fmt.Println(failure.GetOrElse(5)) // Print 5
fmt.Println(someOption.GetOrElse(5)) // Print 10
fmt.Println(failure.GetOrElseCause()) // Print "default Try error"
fmt.Println(someOption.GetOrElseCause()) // Print 10
successLambda := func ()(int, error) { return 10, nil})
failureLambda := func ()(int, error) {return 0, defaultTryError }
fmt.Println(TryOf(failureLambda).IsFailure()) // Print true
fmt.Println(TryOf(successLambda).IsFailure()) // Print false
For more usage details check tests.
Either
defaultEitherError = errors.New("default Either error")
right = RightOf[error, int](10)
left = LeftOf[error, int](defaultEitherError)
fmt.Println(right.GetOrElse(20)) // Print 10
fmt.Println(left.GetOrElse(20)) // Print 20
fmt.Println(right.GetLeftOrElse(error.New("new error"))) // Print "new error"
fmt.Println(left.GetOrElse(error.New("new error"))) // Print "default Either error"
var mapper = func (value int) string { return strconv.Itoa(value) }
var mapRight Either[error, string] = MapEither(right, mapper)
fmt.Println(mapRight.GetOrElse("good")) // Print "10"
For more usage details check tests.