Video source ：B standing 《golang Introduction to project practice [2021 newest Go Language course , There is no nonsense , Dry only ！ Ongoing update ...]》

Organize the teacher's course content and test notes while studying , And share it with you , Infringement is deleted , Thank you for your support ！

Attach summary sticker ：Go Language self-study series | Summary _COCOgsta The blog of -CSDN Blog

go The language has no object-oriented features , There is no concept of class objects . however , You can use structures to simulate these properties , We all know that there are concepts such as class methods in object-oriented . We can also declare some methods , Belong to a structure .

go Grammar of pre research method

Go The method in , It's a special function , Domain of definition struct above （ And struct relation 、 binding ）, go by the name of struct The recipient of （receiver）. Generally speaking , The method is a function with a receiver .

The syntax is as follows ：

type mytype struct{}

func (recv mytype) my_method(para) retrun_type {}
func (recv *mytype) my_method(para) return_type {}

mytype： Define a structure

recv： The structure that accepts the method （receiver）

my_method： Method name

para： parameter list

return_type： return type

As can be seen from the grammatical format , A method is very similar to a function , One more acceptance type .

example

package main

import "fmt"

type Person struct {
    name string
}

func (per Person) eat() {
    fmt.Println(per.name + " eating....")
}

func (per Person) sleep() {
    fmt.Println(per.name + " sleep....")
}

func main() {
    var per Person
    per.name = "tom"
    per.eat()
    per.sleep()
}

Running results

[Running] go run "d:\SynologyDrive\ software development \go\golang Introduction to project practice \goproject\360duote.com\pro01\test.go"
tom eating....
tom sleep....

go Precautions for language methods

1. Methodical receiver type Not necessarily struct type ,type Defined type alias 、slice、map、channel、func All types are OK .
2. struct The method combined with it is equivalent to the class in object-oriented . It's just struct It can be separated from its method , It doesn't have to belong to the same file , But it must belong to the same package .
3. Methods have two types of reception ：（T Type） and （T *Type）, There is a difference between them .
4. The method is the function , therefore Go There is no method overload in （overload） That's what I'm saying , That is, all method names in the same type must be unique .
5. If receiver It's a pointer type , Will automatically dereference .
6. Methods and type It's separate. , Means the behavior of the instance （behavior） And data storage （field） It's separate. , But they go through receiver Build relationships .