Creating new Go packages

1、创建一个Go package，叫： MyLib
• Let’s create a Go package called MyLib and use it in our program

2、在go_project文件夹下开启终端，输入指令创建go.mod文件。

go mod init go_project

• Assuming our program resides in go_project/, then type “go mod init go_project” to create a go.mod file

• The go.mod file tells Go that go_project is a module (a module contains one or more packages) – and that our new package can be found in the current directory

3、创建一个目录，叫：MyLib
• Next, create a directory named MyLib

4、在这个目录下，创建文件，叫：Lib1.go
• In MyLib directory, create a file named Lib1.go

Using our Go packages

5、导入MyLib到我们的程序
• Import MyLib into our program

6、调用MyLib中的方法
• Call the method(s) in MyLib

Visibility in Go packages

• A package 是最小的单位 of private encapsulation（私有封装） in Go
• All identifiers defined within a package are visible within the
package
• When a package is being imported, only its exported identifiers
can be accessed
• An identifier is exported if it begins with a Capital letter

Package (Example)

#参考网站
https://go.dev/tour/list

https://www.golang-book.com/books/intro

https://yourbasic.org/golang/

https://www.digitalocean.com/community/tutorials/how-to-use-go-modules

https://github.com/golang/tools/blob/master/gopls/doc/workspace.md