golang dynamic type

gistfile1.go

package main

type I interface {
  Foo()
}

type A struct {

}

func (p *A) Foo() {}

type B struct {

}

func (p *B) Foo() {}

func F(i I) {
  i.Foo() // dynamic type
}

func main() {
  a := A{}
  b := B{}

  F(a)
  F(b)
}