Golang's iota

iota.go

package main

import (
	"fmt"
)

const zero = iota // Iota is the first in decalration scope, so it should be 0

const (
	a = -2
	b = -9
	c = 19
	d = iota // Iota is the fourth, so it should be 3.
)

const (
	e = 13
	f = 8
	g = iota // Iota is the third, so it should be 2.
)

const (
	h = iota // 0
	i = iota // 1 We can use iota string, it will increment the integer.
	j        // 2 We can leave iota string, it's equivalent.
	k        // 3
)

const (
	s = "string"
	t = iota // 1
)

func main() {
	fmt.Println("Hello, playground")

	fmt.Println(zero)

	fmt.Println(a, b, c, d)

	fmt.Println(e, f, g)

	fmt.Println(h, i, j, k)

	fmt.Println(s, t)
}