Learning Functional Programming in Go

main.go

We'll manipulate strings and some JSON, as well as a car functor:

package mainimport (   "encoding/json"   "fmt"   "functor"   "strings")

Create a cars variable to hold a Car type and initialize it with two cars. Since we annotated our Make and Model fields with 'json', we can easily unmarshal a Toyota Highlander into a car:

func main() {   cars := []functor.Car{      {"Honda", "Accord"},      {"Lexus", "IS250"}}   str := `{"make": "Toyota", "model": "Highlander"}`   highlander := functor.Car{}   json.Unmarshal([]byte(str), &highlander)   cars = append(cars, highlander)

Now, let's exercise our car functor and verify that it works properly:

fmt.Println("initial state   :", functor.Wrap(cars))fmt.Println("unit application:", functor.Wrap(cars).Map(functor.Unit)) ...