better_fib.go

package main

import "fmt"

func fibonaci(l uint) uint {
	var fibo func(arr []uint, l uint) uint
	var ret uint
	fibo = func(arr []uint, l uint) uint {
		if l > 2 {
			ret = fibo([]uint{arr[1], (arr[0] + arr[1])}, l-1)
		} else {
			ret = arr[1]
		}
		return ret
	}
	return fibo([]uint{1, 1}, l)
}

func main() {
	fmt.Println(fibonaci(8))
}