Map in Golang

A simple map program in Golang on how to use it properly. 

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Program Listing

package main 

import "fmt"

func main() {
 grades := make(map[string]float32)

 grades["john"] = 42
 grades["peter"] = 55
 grades["luke"] = 45

 fmt.Println(grades)

 JohnGrade := grades["john"]
 fmt.Println(JohnGrade)

 delete(grades,"john")
 
 fmt.Println(grades)
 grades["john"] = 55
 grades["john"] = 65
 for k,v := range grades {
  fmt.Println(k,v)
 }

 // remove var if using :=
 ages := make(map[string]float32)  // need to do make since its nil

 ages["jude"] = 10

 fmt.Println(ages)

}