package main

import "fmt"

//this calls itself until it reaches the base case of fact(0)
func fact(n int) int {
	if n == 0 {
		return 1
	}
	return n * fact(n-1)
}

func main() {
	fmt.Println(fact(7))

	// closures can also be recursive,
	// but this requires the closure to be declared with
	// a typed var explicitly before its defined
	var fib func(n int) int

	fib = func(n int) int {
		if n < 2 {
			return n
		}
		return fib(n-1) + fib(n-2)
	}

	//simce fib was previously declared in main Go knows which function to call with fib here
	fmt.Println(fib(7))
}