Structs / Basic declaration / Essential Go
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package main
import (
"fmt"
)
// User describes a user
type User struct {
FirstName, LastName string
Email string
Age int
userID int
}
// FullName returns full name of a user
func (u *User) FullName() string {
return fmt.Sprintf("%s %s", u.FirstName, u.LastName)
}
func main() {
// zero value of struct
var u User
fmt.Printf("u: %#v\n\n", u)
// pu is *User i.e. a pointer to User struct
pu := new(User)
pu.Age = 33
fmt.Printf("*pu: %#v\n", *pu)
// &User{} is the same as new(User)
pu = &User{}
pu.Age = 18
fmt.Printf("*pu: %#v\n", *pu)
pu.FirstName, pu.LastName = "Jane", "Doe"
fmt.Printf("pu.FullName(): %s\n", pu.FullName())
}
Go
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