Solution to Golang tour Fibonacci closure exercise

fibonacci_closure.go

// go tour fibonacci closure exercise solution
// https://tour.golang.org/moretypes/26

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
	a := 1
	b := 0
	
	return func() int {
		a, b = b, a + b
		return a
	}
}

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