go-tour-44.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
    i1 := 0
    i2 := 1
    return func() int {
        i := i1 + i2
        i1 = i2
        i2 = i
        return i
    }    
}

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