"golang struct" Code Answer's
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go create new instance of struct
type Person struct {
Name string
}
func main() {
var me Person
me.name = "mattalui"
}
golang struct
package main
import (
"encoding/json"
"fmt"
"log"
)
// sigle struct
type Contact struct {
id int
name string
phone int
}
// nested struct
type ShowRoom struct {
address string
location string
postalcode int
}
// sub nested struct
type Car struct {
id int
name string
price float32
showroom ShowRoom
}
// same struct type defination
type Person struct {
Firstname, Lastname string
}
// json struct
type Book struct {
Name string `json:"name"`
Price float32 `json:"price"`
Author string `json:"author"`
}
// struct as parameter
func GetContact(contact Contact) {
fmt.Println("get struct with as parameter", contact)
}
// read struct with method
func (supercar Car) GetSuperCar() {
fmt.Println("read struct with method", supercar)
}
func main() {
var ContactPerson Contact
var SuperCar Car
var Biodata Person
abstractStruct := struct {
Name string
Age int
}{
Name: "john doe",
Age: 23,
}
var MyBook Book
ContactPerson.id = 1
ContactPerson.name = "john doe"
ContactPerson.phone = 87887242895
NewContactPerson := Contact{2, "jane doe", 8777888555666}
GetContactPointer := &ContactPerson
SuperCar.id = 1
SuperCar.name = "lambogini"
SuperCar.price = 1.500000000
SuperCar.showroom.address = "jl.nusantara kap 50 - 51"
SuperCar.showroom.location = "depok"
SuperCar.showroom.postalcode = 163353
Biodata.Firstname = "aldi"
Biodata.Lastname = "khan"
MyBook.Name = "hary potter"
MyBook.Price = 50.000
MyBook.Author = "jk.rolling"
json, err := json.Marshal(MyBook)
fmt.Println("read struct step one", ContactPerson)
fmt.Println("read struct step two", NewContactPerson)
fmt.Printf("read struct by key %v\n", ContactPerson.name)
GetContact(ContactPerson)
fmt.Println("read struct with pointer", *GetContactPointer)
fmt.Println("read struct by key with pointer", (*GetContactPointer).phone)
fmt.Println("read nested struct", SuperCar)
fmt.Println("read nested struct with key", SuperCar.showroom.location)
SuperCar.GetSuperCar()
fmt.Println("read struct with same type defination", Biodata)
fmt.Println("read abstract struct", abstractStruct)
if err != nil {
log.Fatal(err)
} else {
fmt.Println("read struct with json style", string(json))
}
}
go structs
// A struct is a type. It's also a collection of fields
// Declaration
type Vertex struct {
X, Y int
}
// Creating
var v = Vertex{1, 2}
var v = Vertex{X: 1, Y: 2} // Creates a struct by defining values with keys
var v = []Vertex{{1,2},{5,2},{5,5}} // Initialize a slice of structs
// Accessing members
v.X = 4
// You can declare methods on structs. The struct you want to declare the
// method on (the receiving type) comes between the the func keyword and
// the method name. The struct is copied on each method call(!)
func (v Vertex) Abs() float64 {
return math.Sqrt(v.X*v.X + v.Y*v.Y)
}
// Call method
v.Abs()
// For mutating methods, you need to use a pointer (see below) to the Struct
// as the type. With this, the struct value is not copied for the method call.
func (v *Vertex) add(n float64) {
v.X += n
v.Y += n
}
init struct go
type Student struct {
Name string
Age int
}
var a Student // a == Student{"", 0}
a.Name = "Alice" // a == Student{"Alice", 0}
Source: yourbasic.org
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