First try of Generics types in Go

The long wanted Generics feature is finally available in Go 1.18!

package main

import "fmt"

type NumberOrString interface {
	int64 | string
}

func Swap[V NumberOrString](a, b V) (V, V) {
	return b, a
}

func main() {
	var n1, n2 int64 = 123, 456
	n3, n4 := Swap(n1, n2)
	fmt.Println(n3, n4)

	var s1, s2 string = "Mike", "Lin"
	s3, s4 := Swap(s1, s2)
	fmt.Println(s3, s4)
}

And the Go Playground link. Will dig more into the new feature and I believe that it will be so fun!!! Also check the official tutorial if you can't wait.