#golang §45 Exercise: Fibonacci closure

A Tour of Go chapter 45

Exercise: Fibonacci closure

Let's have some fun with functions.
Implement a fibonacci function that returns a function (a closure) that returns successive fibonacci numbers.

Example

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
	pre0 := 1
	pre1 := 0
	f := func() int {
		fib := pre0 + pre1
		pre0 = pre1
		pre1 = fib
		return fib
	}
	return f
}

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