Go 定义一个Map

package main



import "fmt"



func main() {

   var countryCapitalMap map[string]string

   /* create a map*/

   countryCapitalMap = make(map[string]string)



   /* insert key-value pairs in the map*/

   countryCapitalMap["France"] = "Paris"

   countryCapitalMap["Italy"] = "Rome"

   countryCapitalMap["Japan"] = "Tokyo"

   countryCapitalMap["India"] = "New Delhi"



   /* print map using keys*/

   for country := range countryCapitalMap {

      fmt.Println("Capital of",country,"is",countryCapitalMap[country])

   }



   /* test if entry is present in the map or not*/

   capital, ok := countryCapitalMap["United States"]



   /* if ok is true, entry is present otherwise entry is absent*/

   if(ok){

      fmt.Println("Capital of United States is", capital)  

   } else {

      fmt.Println("Capital of United States is not present")

   }

}