Contents

Go Tutorial Part 10 - Struct

hasnain2808 included in Go Tutorial

2021-04-04 232 words 2 minutes

Contents

1 Introduction

like a js object
like hash in ruby
like dict in python

2 Define a `struct`

type person struct {
	firstName string
	lastName  string
}

3 Initialize a `struct`

3.1 The not recommended way

alex_not_recommended := person{"Alex", "Anderson"}
fmt.Println(alex_not_recommended)

3.2 The recommended way

alex := person{firstName: "Alex" lastName:"Anderson"}
fmt.Println(alex)

3.3 Empty initialization

3.3.1 Initialization

var alex person
fmt.Println(alex)
fmt.Printf("%+v", alex)

this will initialize the struct with Zero Values

Type	Zero value
string	""
int	0
bool	false

3.3.2 Updating

alex.firstName = "Alex"
alex.lastName = "Anderson"

4 Struct Composition

4.1 Syntax 1

package main

import "fmt"

type contactInfo struct {
	email   string
	zipCode int
}

type person struct {
	firstName string
	lastName  string
	contact   contactInfo
}

func main() {
	jim := person{
		firstName: "Jim",
		lastName:  "Party",
		contact: contactInfo{
			email:   "jim@gmail.com",
			zipCode: 9400,
		},
	}
	fmt.Printf("%+v", jim)
}

4.2 Syntax 2

Embed one struct into another

type person struct {
	firstName string
	lastName  string
	contactInfo
}

func main() {
	jim := person{
		firstName: "Jim",
		lastName:  "Party",
		contactInfo: contactInfo{
			email:   "jim@gmail.com",
			zipCode: 9400,
		},
	}
	fmt.Printf("%+v", jim)
}

5 Struct Receiver

package main

import "fmt"

type contactInfo struct {
	email   string
	zipCode int
}

type person struct {
	firstName string
	lastName  string
	contactInfo
}

func main() {
	jim := person{
		firstName: "Jim",
		lastName:  "Party",
		contactInfo: contactInfo{
			email:   "jim@gmail.com",
			zipCode: 9400,
		},
	}
	jim.print()
}

//receiver
func (p person) print() {
	fmt.Printf("%+v", p)
}