I have written a Go program while I was learning interface
Here is the program:
package main
import (
“fmt”
)
type person struct {
name string
age int
}
func (p *person) speak() {
// we have to use p.name & p.age instead of name and age
// to let compiler know that speak wants name and age
// value from person type
// receiver are given to attach a method to a type so that
// the method can use it’s identifiers
// it can be of pointer type and non pointer type
fmt.Printf(“My name is %s and I am %d years old\n”, p.name, p.age)
}
type human interface {
//
speak()
}
func saySomething(h human) {
h.speak()
}
func main() {
p1 := person{
name: “James Bond”,
age: 32,
}
// We have to pass the address of person type variable because
// the speak method which is attached to a pointer type person
// expects the address of person type identifier
saySomething(&p1) // this will work
//saySomething(p1) // this won’t work
}
i want to know how does interface works, i mean how does the compiler reads it.
I have tried many time to read it my self. But i always get stuck at interface.
