Detailed explanation of Go language class methods and object methods

In Go language, class method (type) acts on the entire structure type and is used to perform operations that do not operate on specific instances. Object methods (receiver) are bound to specific instances and used to operate instance data. In the actual case, class methods are used to create and obtain employee information, and object methods are used to update employee-specific information.

Go language: in-depth analysis of class methods and object methods

In the Go language, a method is associated with a structure Functions for accessing and manipulating structure data. Class methods and object methods are two different method types, each with its own specific purpose.

Class methods

Class methods are declared using the keyword type and are not attached to a specific instance of the structure, but act on the entire structure type. Class methods are usually used to perform structure-related operations without operating on specific structure instances.

Syntax:

func (Type_Name) MethodName(parameters) (return_types)

Instance:

type Person struct {
    Name string
    Age  int
}

// 类方法
func (p Person) Greeting() {
    fmt.Println("Hello, I'm", p.Name)
}

Object method

Object method usage func (receiver type) declaration, needs to be bound to a specific instance of the structure. Object methods are used to manipulate specific data of structure instances.

Grammar:

func (receiver Type_Name) MethodName(parameters) (return_types)

Example:

type Employee struct {
    Name     string
    Salary   int
    Position string
}

// 对象方法
func (e *Employee) Promote(newPosition string) {
    e.Position = newPosition
}

Practical case

Employee management system

Create an employee management system, in which:

• class method is used to create new employees and obtain all employee information from the database.
• Object methods are used to update employee information, such as name, salary and position.

Code:

type Employee struct {
    ID       int
    Name     string
    Salary   int
    Position string
}

func (e *Employee) NewEmployee(name, position string, salary int) error {
    // 创建新员工
}

func (e *Employee) GetAllEmployees() ([]*Employee, error) {
    // 获取所有员工信息
}

func (e *Employee) UpdateName(name string) error {
    // 更新员工姓名
}

func (e *Employee) UpdateSalary(salary int) error {
    // 更新员工工资
}

func (e *Employee) UpdatePosition(position string) error {
    // 更新员工职位
}

In this practical case, the class method is used to manage the entire employee database, while the object method is used to operate the information of a specific employee.

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