Fibonacci closure in Go

exercise-fibonacci-closure.go

// my solution to https://go.dev/tour/moretypes/26
package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int

func fibonacci() func() int {
	a, b := -1, 0
	return func() int {
		a, b = b, a+b
		return -a
	}
}

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