Methods

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In Go, Methods are similar to func except that they have a receiver to operate on. To get full_name of a person we would love to define a method to Person struct like

func(p Person) full_name() {
  fmt.Println(p.first_name, p.last_name)
}
p.full_name()
//=> "John Lego"

Well done Jack! But problem with this method is, it is printing full_name to standard output. But in real world we would need our full_name to return full name of a person. Here is how

func(p Person) full_name() string {
  s := p.first_name + " " + p.last_name
  return s
}
fmt.Println(p.full_name())
//=> "John Lego"

Just FYI Jack, struct can also have embedded types, not just legacy types. Here is an example of struct Employee

type Employee struct{
  Person
  employee_id string
}

Now to initilize it we need to follow same way, but first argument should be of type person, like

e :=  Employee{Person{"Pankaj", "Bagwan", 26}, "emp101"}
fmt.Println(e.Person.full_name())
fmt.Println(e.full_name())
fmt.Println(e.employee_id)

Note that method defined on struct Person is alo available directly and indirectly to employee.