Golang: iota

 //iota -- similar to enum

package main
import (
"fmt"
)
const(
 _ = iota //_ means dummy variable which will be ignored.
 TrafficLightStateRedLight 
 TrafficLightStateGreenLight
 TrafficLightStateYellowLight
)
func main(){
 fmt.Println("Red Light Status Code: ",TrafficLightStateRedLight)
 fmt.Println("Green Light Status Code: ",TrafficLightStateGreenLight)
 fmt.Println("Yellow Light Status Code: ",TrafficLightStateYellowLight)
} 

package main
import (
"fmt"
)
func main(){
const(
 LosAngeles = 1984+(iota * 4)
 Seoul 
 Barcelona
 Atlanta
 Sydney
 Athens
 Beijing
 London
 Rio
 Tokyo
)

fmt.Println("These cities hosted or will host the Summer Olympics in the provided year...")
fmt.Printf("%-18s %-18s \n","City","Year")
fmt.Printf("%-18s %-18v \n","Los Angeles",LosAngeles)
fmt.Printf("%-18s %-18v \n","Atlanta",Atlanta)
fmt.Printf("%-18s %-18v \n","Tokyo",Tokyo)
fmt.Printf("%-18s %-18v \n","London",London)
}