Go lo 使用 go get github.com/samber/lo 使用 // 将切片中的重复元素去掉，只保留第一个出现的元素。 names := lo.Uniq([]string{"Samuel", "John", "Samuel"}) // []string{"Samuel", "John"} // 生成map // 将切片或数组转换为map，key是call

Go Set 集合 Github地址：https://github.com/deckarep/golang-set 使用： go get github.com/deckarep/golang-set/v2 集合里的元素不会重复 示例：

Goose 数据库版本管理 集成 package main import ( "context" "flag" "log" "os" "github.com/pressly/goose/v3" _ "modernc.org/sqlite" ) var ( flags = flag.NewFlagSet("goose", flag.ExitOnError) dir = flags.String("dir", ".", "directory with migration files") ) func main() { flags.Parse(os.Args[1:]) args := flags.Args() if len(args) < 3 { flags.Usage() return } dbstring, command := args[1], args[2] db, err := goose.OpenDBWithDriver("sqlite", dbstring) if err != nil { log.Fatalf("goose: failed to

Java 一、基础 1、helloworld public class Hello { public static void main(String[] args) { System.out.println("Hello, world!"); } } [root@Sugar j1]🐳 java Hello.java Hello, world! 2、变量定义 int n = 100; n = 200; // 变量n赋值为200 int i2 = -2147483648; int i3 =

cloud-init https://hmli.ustc.edu.cn/doc/linux/ubuntu-autoinstall/ubuntu-autoinstall.html ubuntu 安装后获取当前的user-data: /var/log/installer/autoinstall-user-data 示例： #cloud-config autoinstall: version: 1 apt: disable_components: [] fallback: offline-install geoip: true mirror-selection: primary: - uri: http://mirrors.ustc.edu.cn/ubuntu-ports - country-mirror - arches: &id001 - amd64 - i386 uri: http://mirrors.ustc.edu.cn/ubuntu/ - arches: &id002 - s390x - arm64 - armhf - powerpc - ppc64el - riscv64 uri: http://mirrors.ustc.edu.cn/ubuntu-ports preserve_sources_list:

Go conc 参考链接 https://www.liwenzhou.com/posts/Go/conc/ go package main import ( "fmt" "time" ) func main() { for i := 0; i < 5; i++ { go func(num int) { fmt.Println(num) }(i) } time.Sleep(5 * time.Second) } sync.WaitGroup 控制并发 package main import ( "fmt" "sync" ) var wg sync.WaitGroup func hello(i int) { defer wg.Done() fmt.Println("Hello Goroutine!", i) } func main() { for i := 0;