search
HomeBackend DevelopmentGolangTwo ways for Golang to determine whether a method exists in a structure (with code examples)

This article will teach you Golang and talk about how Golang determines whether a structure has a certain method. I hope it will be helpful to everyone.

Two ways for Golang to determine whether a method exists in a structure (with code examples)

go Determine whether a structure has a certain method

go Sometimes it is necessary to determine whether a certain structure has a certain method , but you may suddenly feel confused. Go can also determine

like PHP. Yes, although go does not provide a ready-made method, it can be encapsulated and implemented using existing logic. [Recommended learning: go video tutorial]

There are currently two methods that can be used. One is to know the complete method and can use the interface assertion method to judge, and the second is to use reflection. Complete judgment.

Prepare the structure that needs to be judged:

type  RefData  struct  {}

func  (this  *RefData)  Show(data  any,  name  string)  string  {
  data2  :=  data.(string)  +  "==="  +  name

  return  data2
}

Interface assertion judgment:

refDataExists := false
var refDataOb any = &RefData{}
if _, ok := refDataOb.(interface {
    Show(any, string) string
}); ok {
    refDataExists = true
}

Reflection judgment:

import(
  "reflect"
)
// 判断结构体方法是否存在
func MethodExists(in any, method string) bool {
    if method == "" {
        return false
    }
    p := reflect.TypeOf(in)
    if p.Kind() == reflect.Pointer {
        p = p.Elem()
    }
    // 不是结构体时
    if p.Kind() != reflect.Struct {
        return false
    }
    object := reflect.ValueOf(in)
    // 获取到方法
    newMethod := object.MethodByName(method)
    if !newMethod.IsValid() {
        return false
    }
    return true
}
// 使用
refDataExists := MethodExists(&RefData{},  "Show")

The above is the detailed content of Two ways for Golang to determine whether a method exists in a structure (with code examples). For more information, please follow other related articles on the PHP Chinese website!

Statement
This article is reproduced at:learnku. If there is any infringement, please contact admin@php.cn delete
go语言有没有缩进go语言有没有缩进Dec 01, 2022 pm 06:54 PM

go语言有缩进。在go语言中,缩进直接使用gofmt工具格式化即可(gofmt使用tab进行缩进);gofmt工具会以标准样式的缩进和垂直对齐方式对源代码进行格式化,甚至必要情况下注释也会重新格式化。

聊聊Golang中的几种常用基本数据类型聊聊Golang中的几种常用基本数据类型Jun 30, 2022 am 11:34 AM

本篇文章带大家了解一下golang 的几种常用的基本数据类型,如整型,浮点型,字符,字符串,布尔型等,并介绍了一些常用的类型转换操作。

go语言为什么叫gogo语言为什么叫goNov 28, 2022 pm 06:19 PM

go语言叫go的原因:想表达这门语言的运行速度、开发速度、学习速度(develop)都像gopher一样快。gopher是一种生活在加拿大的小动物,go的吉祥物就是这个小动物,它的中文名叫做囊地鼠,它们最大的特点就是挖洞速度特别快,当然可能不止是挖洞啦。

一文详解Go中的并发【20 张动图演示】一文详解Go中的并发【20 张动图演示】Sep 08, 2022 am 10:48 AM

Go语言中各种并发模式看起来是怎样的?下面本篇文章就通过20 张动图为你演示 Go 并发,希望对大家有所帮助!

tidb是go语言么tidb是go语言么Dec 02, 2022 pm 06:24 PM

是,TiDB采用go语言编写。TiDB是一个分布式NewSQL数据库;它支持水平弹性扩展、ACID事务、标准SQL、MySQL语法和MySQL协议,具有数据强一致的高可用特性。TiDB架构中的PD储存了集群的元信息,如key在哪个TiKV节点;PD还负责集群的负载均衡以及数据分片等。PD通过内嵌etcd来支持数据分布和容错;PD采用go语言编写。

聊聊Golang自带的HttpClient超时机制聊聊Golang自带的HttpClient超时机制Nov 18, 2022 pm 08:25 PM

​在写 Go 的过程中经常对比这两种语言的特性,踩了不少坑,也发现了不少有意思的地方,下面本篇就来聊聊 Go 自带的 HttpClient 的超时机制,希望对大家有所帮助。

go语言是否需要编译go语言是否需要编译Dec 01, 2022 pm 07:06 PM

go语言需要编译。Go语言是编译型的静态语言,是一门需要编译才能运行的编程语言,也就说Go语言程序在运行之前需要通过编译器生成二进制机器码(二进制的可执行文件),随后二进制文件才能在目标机器上运行。

golang map怎么删除元素golang map怎么删除元素Dec 08, 2022 pm 06:26 PM

删除map元素的两种方法:1、使用delete()函数从map中删除指定键值对,语法“delete(map, 键名)”;2、重新创建一个新的map对象,可以清空map中的所有元素,语法“var mapname map[keytype]valuetype”。

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment