A brief analysis of the declaration and usage of methods in golang
Golang is an open source programming language developed by Google and released in 2009. It has the characteristics of simplicity, clarity, efficiency, and parallelism, and is widely used to build high-performance Web applications, network services, etc. Among them, method is one of the important concepts that supports object-oriented programming in Golang.
Methods in Golang are functions that act on the receiver. They can be thought of as functions of a certain type, used to operate on objects of that type. Let's introduce Golang's method declaration and its use.
The Golang method declaration format is as follows:
func (receiver_name ReceiverType) MethodName(parameter_list) (return_type_list) { // method body }
Among them, receiver_name is the name of the receiver, ReceiverType is the type of the receiver, parameter_list is the parameter list, and return_type_list is the return value list. The format of the method name, parameter list, and return value list is the same as that of an ordinary function.
In Golang, there are two ways to set receivers: value receivers and pointer receivers.
The declaration format of the value receiver is:
func (v ValueTypeName) MethodName(parameter_list) (return_type_list) { // method body }
The declaration format of the pointer receiver is:
func (v *ValueTypeName) MethodName(parameter_list) (return_type_list) { // method body }
Among them, ValueTypeName is the type name of the receiver. Value receivers and pointer receivers have different characteristics when used. Modifications of the receiving object by the value receiver will not affect the original object, while the pointer receiver can modify the value of the original object.
The example is as follows:
type Person struct { name string age int } func (p Person) sayHello() { fmt.Println("Hello, my name is", p.name) } func (p *Person) setAge(newAge int) { p.age = newAge } func main() { p1 := Person{"John", 25} p1.sayHello() // Hello, my name is John p1.setAge(30) fmt.Println(p1.age) // 输出:30 }
In this example, two methods are defined in the Person structure: sayHello and setAge. sayHello uses a value receiver, which simply prints out its name; setAge uses a pointer receiver, which can modify the age attribute of the receiver.
The selection of value receivers and pointer receivers requires attention to some details. One of the main differences is that when the value of the receiver needs to be modified, a pointer receiver must be used. Otherwise, once the method is executed, the receiver The value of the controller will be discarded and the original value will not be affected.
In general, Golang's method is a very convenient and flexible object-oriented programming method. We can use methods to manipulate types and implement convenient functionality. Whether to use a value receiver or a pointer receiver needs to be chosen based on specific needs. I believe that if you master the use of methods, you can better take advantage of Golang.
The above is the detailed content of A brief analysis of the declaration and usage of methods in golang. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

This article explains Go's package import mechanisms: named imports (e.g., import "fmt") and blank imports (e.g., import _ "fmt"). Named imports make package contents accessible, while blank imports only execute t

This article details efficient conversion of MySQL query results into Go struct slices. It emphasizes using database/sql's Scan method for optimal performance, avoiding manual parsing. Best practices for struct field mapping using db tags and robus

This article explains Beego's NewFlash() function for inter-page data transfer in web applications. It focuses on using NewFlash() to display temporary messages (success, error, warning) between controllers, leveraging the session mechanism. Limita

This article explores Go's custom type constraints for generics. It details how interfaces define minimum type requirements for generic functions, improving type safety and code reusability. The article also discusses limitations and best practices

This article demonstrates creating mocks and stubs in Go for unit testing. It emphasizes using interfaces, provides examples of mock implementations, and discusses best practices like keeping mocks focused and using assertion libraries. The articl

This article details efficient file writing in Go, comparing os.WriteFile (suitable for small files) with os.OpenFile and buffered writes (optimal for large files). It emphasizes robust error handling, using defer, and checking for specific errors.

The article discusses writing unit tests in Go, covering best practices, mocking techniques, and tools for efficient test management.

This article explores using tracing tools to analyze Go application execution flow. It discusses manual and automatic instrumentation techniques, comparing tools like Jaeger, Zipkin, and OpenTelemetry, and highlighting effective data visualization
