A Tour of Go 44 연습: 피보나치 클로져

package main

import "fmt"

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

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