Golang, Gin: Struct

Use a Struct (like Class) to encapsulate dependencies, methods, and functionality.

Here's an example of a single struct with attributes and methods in Go to demonstrate how a struct can encapsulate both data (attributes) and behavior (methods).

Example: Single Struct with Attributes and Methods

package main

import (
	"fmt"
)

=================================
// User struct with attributes and methods
type User struct {
	ID   int
	Name string
	Age  int
}

=================================
// Method: Displays user details
func (u *User) DisplayDetails() {
	fmt.Printf("User ID: %d\n", u.ID)
	fmt.Printf("Name: %s\n", u.Name)
	fmt.Printf("Age: %d\n", u.Age)
}

=================================
// Method: Updates the user's name
func (u *User) UpdateName(newName string) {
	u.Name = newName
	fmt.Println("Name updated successfully!")
}

=================================
// Method: Checks if the user is an adult
func (u *User) IsAdult() bool {
	return u.Age >= 18
}

=================================
func main() {
	// Create a new User instance
	user := User{
		ID:   1,
		Name: "John Doe",
		Age:  25,
	}

	// Call methods on the User struct
	fmt.Println("Initial User Details:")
	user.DisplayDetails()

	// Update the user's name
	user.UpdateName("Jane Doe")
	fmt.Println("\nUpdated User Details:")
	user.DisplayDetails()

	// Check if the user is an adult
	if user.IsAdult() {
		fmt.Println("\nThe user is an adult.")
	} else {
		fmt.Println("\nThe user is not an adult.")
	}
}

Explanation of the Code

1. Struct Definition:

   • The User struct represents a user with three attributes: ID, Name, and Age.

2. Methods:

   • DisplayDetails: Prints the user's details to the console.
   • UpdateName: Updates the user's name to a new value.
   • IsAdult: Checks if the user's age is 18 or older and returns a boolean.

3. Creating and Using the Struct:

   • An instance of User is created with initial values.
   • Methods are called to interact with the instance, modifying its attributes and performing operations.

Output of the Program

Initial User Details:
User ID: 1
Name: John Doe
Age: 25

Name updated successfully!

Updated User Details:
User ID: 1
Name: Jane Doe
Age: 25

The user is an adult.

Summary

This is how you can use a single struct in Go to encapsulate both data (attributes) and behavior (methods), similar to a class in PHP.