Methods are just like functions in that they can be used as values, and passed to other functions as parameters.
Let me show you an example:
type T struct {
a int
}
func (t T) print(message string) {
fmt.Println(message, t.a)
}
func (T) hello(message string) {
fmt.Println("Hello!", message)
}
func callMethod(t T, method func(T, string)) {
method(t, "A message")
}
func main() {
t1 := T{10}
t2 := T{20}
var f func(T, string) = T.print
callMethod(t1, f)
callMethod(t2, f)
callMethod(t1, T.hello)
}
>>> A message 10
>>> A message 20
>>> Hello! A message
The part to notice is the type of such variable that holds reference to the method:
var f func(T, string) = T.print
It has first argument of same type, and others are regular arguments needed by that method.
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