Exercise: Fibonacci closure
package main
import "fmt"
// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
idx, beforeLastN, lastN := 0, 0, 1
return func() int {
if (idx == 0) {
idx++
return beforeLastN
}
if (idx == 1) {
idx++
return lastN
}
sum := beforeLastN + lastN
beforeLastN = lastN
lastN = sum
return sum
}
}
func main() {
f := fibonacci()
for i := 0; i < 10; i++ {
fmt.Println(f())
}
}