Fibonacci in GO

main.go

package main

import "fmt"

func fibonacci() func() int {
    first, second := 0, 1
    return func() int {
        ret := first
        first, second = second, first+second
        return ret
    }
}

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