Golang括号语法解释

Question

我不知道这段代码中这些括号的作用是什么:

func main() {
    router := gin.Default()

    v1 := router.Group("/v1")
    { // <- these brackets
        v1.POST("/login", loginEndpoint)
        v1.POST("/submit", submitEndpoint)
        v1.POST("/read", readEndpoint)
    } // <- and these

    v2 := router.Group("/v2")
    { // <- and these
        v2.POST("/login", loginEndpoint)
        v2.POST("/submit", submitEndpoint)
        v2.POST("/read", readEndpoint)
    } // <- and these

    router.Run(":8080")
}

从这里得到这个代码:https://github.com/gin-gonic/gin#grouping-routes 你能解释一下吗？

Answer 1

由于词法作用域(如评论的那样)没有任何作用域，所以它在这里更像是一种“编码风格”，如 gin-gonic/gin issue 108 中所表达的那样

I, personally, like to use the brackets because it gives a sense of group, and makes the routes easier to read.

// notify the "test" variable
test := r.Group("/", TestHandle())
{
    test.GET("/test", func(c *gin.Context) {
        fmt.Printf("test")
        c.String(200, "ok")
    })
}