Golang Gin: Composition Instead of Inheritance

Composition Instead of Inheritance

In Go, you can "extend" functionality by embedding structs. When a struct embeds another struct, it inherits its methods and fields.

Example of Composition (Struct Embedding):

package main

===========================
import "fmt"

// Base struct
type Base struct {
	ID int
}

// Method of Base struct
func (b *Base) PrintID() {
	fmt.Printf("ID: %d\n", b.ID)
}

===========================
// Extended struct using composition
type Extended struct {
	Base          // Embedding Base struct
	Name string
}

===========================
func main() {
	// Initialize Extended
	ext := Extended{
		Base: Base{ID: 42},
		Name: "Le Giang",
	}

	// Access methods from Base
	ext.PrintID()

	// Access field from Extended
	fmt.Println("Name:", ext.Name)
}

Output:

ID: 42
Name: Le Giang

Thank