Fibonacci using closure in Go - Excercise

exercise-fibonacci-closure.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
	x := 0
	y := 1
	return func() int{
		if x == 0 && y ==1{
			x = y
			return 0
		}
		fib := x
		x = y
		y += fib
		//fmt.Println("X ", y)
		return fib
	}
}

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