Fibonacci closure: http://tour.golang.org/#48

gistfile1.go

package main

import "fmt"

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

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

func Fibonacci() func() uint {
	var a, b uint = 1, 0
	return func() uint {
		a, b = b, a+b
		return a
	}
}

thanks for the gist,it is very much useful
I make Benchmarking for deferent Fibonacci functions and algorithms with running unit test
https://github.com/msh2050/GoFibonacciBench