Map type

A map is an unordered group of elements of one type, called the element type, indexed by a set of unique keys of another type, called the key type. The value of an uninitialized map is nil.

Here is a simple go lang example that shows how to use of a map.

Source: (example.go)

package main
 
import "fmt"
 
func main() {
 
  colors := make(map[int]string)
  colors[1] = "Red"
  colors[2] = "Orange"
  colors[3] = "Yellow"
 
  fmt.Println(colors)
  fmt.Println(colors[1])
}
 

Output:

$ go run example.go
map[1:Red 2:Orange 3:Yellow]
Red