exercise-fibonacci-closure.go

exercise-fibonacci-closure.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
  n := 0
  fn2 := 1
  fn1 := 1
  return func() int{
	switch n {
	case 0:
	  n += 1
	  return 0
	case 1, 2:
	  n += 1
	  return 1
	}
	
	fn := fn2 + fn1
	fn2 = fn1
	fn1 = fn
	return fn
  }
}

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