GO语言用闭包实现斐波那契序列

https://tour.go-zh.org/moretypes/26

package main

import "fmt"

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

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