golang map基础知识

var myGreeting map[string]string fmt.Println(myGreeting) // map[] fmt.Println(myGreeting == nil) //true myGreeting2 := make(map[string]string) myGreeting2["Tim"] = "Good morning." myGreeting2["Jenny"] = "Bonjour." fmt.Println(myGreeting2) //map[Jenny:Bonjour. Tim:Good morning.] myGreeting3 := map[string]string{} myGreeting3["Tim"] = "Good morning." myGreeting3["Jenny"] = "Bonjour." fmt.Println(myGreeting3) //map[Jenny:Bonjour. Tim:Good morning.] myGreeting4 := map[string]string{ "Time": "Good morning.", "Jenny": "Bonjour.", } fmt.Println(myGreeting4) //map[Jenny:Bonjour. Time:Good morning.] fmt.Println(myGreeting4["Jenny"]) //Bonjour.