Golang Fibonnaci

fibo.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {

	var n, f_n_1, f_n_2 = -1, 1, 1

	return func() int {
		n++
		if n == 0 {
			return f_n_2
		} else if n == 1 {
			return f_n_1
		}

		f_n_2, f_n_1 = f_n_1, f_n_2 + f_n_1

		return f_n_1
	}
}

func main() {
	next := fibonacci()
	for i := 0; i < 10; i++ {
		fmt.Println(next())
	}
}