Go入门之map

map类型是引用类型，必须初始化才能使用，为key-value形式

var userinfo = make(map[string]string) userinfo["username"] = "zhangsan" var user = map[string]string{ "username": "张三", "age": "20", } for k, v := range user { fmt.Printf("%v %v\n", k, v) }

初始化方式可以通过make方法，遍历通过range

v, ok := user["username"] fmt.Println(v, ok)

此为查找map中key对应的值是否存在，存在ok返回true，v返回对应的值，否决ok返回false，v返回空

删除用delete函数()

delete(user, "username")

map类型的切片

var userinfo = make([]map[string]string, 2, 2) if userinfo[0] == nil { userinfo[0] = make(map[string]string) userinfo[0]["username"] = "张三" userinfo[0]["age"] = "20" } if userinfo[1] == nil { userinfo[1] = make(map[string]string) userinfo[1]["username"] = "张si" userinfo[1]["age"] = "209" } fmt.Println(userinfo)

map类型的值可以是切片

var userinfo = make(map[string][]string) userinfo["hobby"] = []string{ "吃饭", "睡觉", } fmt.Println(userinfo)