iterate_map.go

package main

import (
  "fmt"
)

type Student struct {
  FirstName string
  LastName  string
}

func main() {
  var classes = make(map[string][]Student)

  var s []Student
  t := Student{FirstName:"Harry", LastName:"Potter"}
  s = append(s,t)
  t = Student{FirstName:"Ronald", LastName:"Weasley"}
  s = append(s,t)
  classes["grade1"] = s

  s = nil
  t = Student{FirstName:"Cedric", LastName:"Diggory"}
  s = append(s,t)
  t = Student{FirstName:"George", LastName:"Weasley"}
  s = append(s,t)
  classes["grade2"] = s

  for key, value := range classes {
    fmt.Println("key=", key)
    arr := value
    for z:=0; z<len(arr); z++ {
      student := arr[z]
      fmt.Println("FirstName=", student.FirstName, "LastName=", student.LastName)
    }
  }
}