A Tour of Go exercise

fibonacci-closure.go

// generates a series of fibonacci numbers

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
// my solution here
func fibonacci() func() int {
	var pre = -2
	var sum = 1
	return func() int {
		switch pre {
			case -2:
				pre++
				return 0
			case -1:
				pre++
				return 1	
			default:
				var tmp = sum
				sum += pre
				pre = tmp
				return sum
		}
	}
}

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