Nested Structure in Golang

This updated guide explores nested structure in golang with practical details, clear explanations, and useful takeaways. A structure or struct in Golang is a user-defined type that allows us to create a group of elements of different types into a single unit. Any real-world entity that has some set of properties or fields can be represented as a struct.

How to Use Nested Structures in Golang

Go language allows nested structures. A structure that is a field of another structure is called a Nested Structure. In other words, a structure inside another structure is called a Nested Structure. Syntax:

type struct_name_1 struct{ // Các trường } type struct_name_2 struct{ variable_name struct_name_1 }

Consider these example to understand nested structure in Golang:

Example 1:

// Chương trình Go minh hoạc // cấu trúc lồng nhau package main import "fmt" // Tạo cấu trúc type Author struct { name string branch string year int } // Tạo cấu trúc lòng nhau type HR struct { // cấu trúc là một trường details Author } func main() { // Khởi tạo các trường // của cấu trúc result := HR{ details: Author{"Sona", "ECE", 2013}, } // Hiện giá trị fmt.Println("nDetails of Author") fmt.Println(result) } 

Result:

Details of Author {{Sona ECE 2013}}

Example 2:

// Chương trình Golang minh họa // cấu trúc lồng nhau package main import "fmt" // Tạo cấu trúc type Student struct { name string branch string year int } // Tạo cấu trúc lồng nhau type Teacher struct { name string subject string exp int details Student } func main() { // Khởi tạo các trường // của cấu trúc result := Teacher{ name: "Suman", subject: "Java", exp: 5, details: Student{"Bongo", "CSE", 2}, } // Hiện giá trị fmt.Println("Details of the Teacher") fmt.Println("Teacher's name: ", result.name) fmt.Println("Subject: ", result.subject) fmt.Println("Experience: ", result.exp) fmt.Println("nDetails of Student") fmt.Println("Student's name: ", result.details.name) fmt.Println("Student's branch name: ", result.details.branch) fmt.Println("Year: ", result.details.year) } 

Result:

Details of the Teacher Teacher's name: Suman Subject: Java Experience: 5 Details of Student Student's name: Bongo Student's branch name: CSE Year: 2

Example 3:

In Go, a structure can have fields that are themselves structures, called nested structures. Here is an example of a structure that has a nested structure:

package main import ( "fmt" ) type Address struct { Street string City string State string PostalCode string } type Person struct { FirstName string LastName string Age int Address Address } func main() { p := Person{ FirstName: "John", LastName: "Doe", Age: 30, Address: Address{ Street: "123 Main St", City: "Anytown", State: "CA", PostalCode: "12345", }, } fmt.Println(p.FirstName, p.LastName) fmt.Println("Age:", p.Age) fmt.Println("Address:") fmt.Println("Street:", p.Address.Street) fmt.Println("City:", p.Address.City) fmt.Println("State:", p.Address.State) fmt.Println("Postal Code:", p.Address.PostalCode) } 

Result:

John Doe Age: 30 Address: Street: 123 Main St City: Anytown State: CA Postal Code: 12345

Here, we define two struct types: Person and Address. Person has a nested struct field called Address. In the main function, we create a new instance of Person with an Address field. Then, we print the values of various fields of the Person and Address structs using dot notation to access the nested fields.