Fibo Closure Function in Go

fibo.go

package main

import "fmt"

func fibonacci() func() int {
    beforeLast, last := 0, -1
	
	return func () int {
		if last < 1 {
			last += 1
		} else {
			newLast := beforeLast + last
			beforeLast = last
			last = newLast
		}
		
		return last
	}
}

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