golang入门小记

不知道为什么，今天突然来了兴致，我要看看golang。

我忽然想起了苏轼，原来我想起了他的那首《记承天寺夜游》
　　元丰六年十月十二日夜，解衣欲睡，月色入户，欣然起行。念无与为乐者，遂至承天寺寻张怀民。怀民亦未寝，相与步于中庭。庭下如积水空明，水中藻、荇交横，盖竹柏影也。何夜无月？何处无竹柏？但少闲人如吾两人者耳。

1.初始化

go mod init example.com/hello

go mod tidy

go run .

2.创建一个go module

https://golang.google.cn/doc/tutorial/create-module

In Go, the := operator is a shortcut for declaring and initializing a variable in one line

In Go, code executed as an application must be in a main package.

3.Call your code from another module

从本地目录导入模块的一种方法
go mod edit -replace example.com/greetings=…/greetings

go mod tidy

4.异常处理

That’s common error handling in Go: Return an error as a value so the caller can check for it.

5. Return a random greeting

go lang对大小写是有要求的
小写，只能在本包内访问，大写，则可以被导出
go 的init是自动执行的
go slice

formats :=[]string{
}

go map

messages := make(map[string]string)

Add a test

The go test command executes test functions (whose names begin with Test) in test files (whose names end with _test.go). You can add the -v flag to get verbose output that lists all of the tests and their results.

Compile and install the application

go build
go install

同一个package名可以有多个文件