题目
Let's have some fun with functions.
Implement a fibonacci function that returns a function (a closure) that returns successive fibonacci numbers (0, 1, 1, 2, 3, 5, ...).
答案
package main
import "fmt"
// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
fib1 := 0
fib2 := 1
return func() int{
fib2 = fib1 + fib2
fib1 = fib2 - fib1
return fib2 - fib1
}
}
func main() {
f := fibonacci()
for i := 0; i < 10; i++ {
fmt.Println(f())
}
}
