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

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

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





OpenSSL, as an open source library widely used in secure communications, provides encryption algorithms, keys and certificate management functions. However, there are some known security vulnerabilities in its historical version, some of which are extremely harmful. This article will focus on common vulnerabilities and response measures for OpenSSL in Debian systems. DebianOpenSSL known vulnerabilities: OpenSSL has experienced several serious vulnerabilities, such as: Heart Bleeding Vulnerability (CVE-2014-0160): This vulnerability affects OpenSSL 1.0.1 to 1.0.1f and 1.0.2 to 1.0.2 beta versions. An attacker can use this vulnerability to unauthorized read sensitive information on the server, including encryption keys, etc.

The library used for floating-point number operation in Go language introduces how to ensure the accuracy is...

Queue threading problem in Go crawler Colly explores the problem of using the Colly crawler library in Go language, developers often encounter problems with threads and request queues. �...

Backend learning path: The exploration journey from front-end to back-end As a back-end beginner who transforms from front-end development, you already have the foundation of nodejs,...

This article introduces a variety of methods and tools to monitor PostgreSQL databases under the Debian system, helping you to fully grasp database performance monitoring. 1. Use PostgreSQL to build-in monitoring view PostgreSQL itself provides multiple views for monitoring database activities: pg_stat_activity: displays database activities in real time, including connections, queries, transactions and other information. pg_stat_replication: Monitors replication status, especially suitable for stream replication clusters. pg_stat_database: Provides database statistics, such as database size, transaction commit/rollback times and other key indicators. 2. Use log analysis tool pgBadg

The problem of using RedisStream to implement message queues in Go language is using Go language and Redis...

The difference between string printing in Go language: The difference in the effect of using Println and string() functions is in Go...

Under the BeegoORM framework, how to specify the database associated with the model? Many Beego projects require multiple databases to be operated simultaneously. When using Beego...
