golang快速入门-12-golang的Map使用

1 package main2 3 import fmt4 5 func printMap(cityMap map[string]string) {6 //cityMap 是一个引用传递7 for key, value := range cityMap {8 fmt.Println(key = , key)9 fmt.Print...

 1 package main
 2 
 3 import "fmt"
 4 
 5 func printMap(cityMap map[string]string) {
 6     //cityMap 是一个引用传递
 7     for key, value := range cityMap {
 8         fmt.Println("key = ", key)
 9         fmt.Println("value = ", value)
10     }
11 }
12 
13 func ChangeValue(cityMap map[string]string) {
14     cityMap["England"] = "London"
15 }
16 
17 func main() {
18     cityMap := make(map[string]string)
19 
20     //添加
21     cityMap["China"] = "Beijing"
22     cityMap["Japan"] = "Tokyo"
23     cityMap["USA"] = "NewYork"
24 
25     //遍历
26     printMap(cityMap)
27 
28     //删除
29     delete(cityMap, "China")
30 
31     //修改
32     cityMap["USA"] = "DC"
33     ChangeValue(cityMap)
34 
35     fmt.Println("-------")
36 
37     //遍历
38     printMap(cityMap)
39 }