Duplicate const values in #golang with iota

duplicate-const-values-with-iota.go

package main

import "fmt"

// iota is reset to 0 at every const declaration
const (
  Zero = iota  // within a const declaration, iota is incremented for every line
  One          // default value is set to iota, which is now 1
  Two = 2      // exlicitly set to 2
  TwoAgain     // default value is set to iota, which is now 2 creating a duplicate 2
)

func main() {
  fmt.Printf("Zero: %d\n", Zero)
  fmt.Printf("One: %d\n", One)
  fmt.Printf("Two: %d\n", Two)
  fmt.Printf("TwoAgain: %d\n", TwoAgain)
}