package learning

import "fmt"

func adder() func(int) int {
	sum := 0
	return func(x int) int {
		fmt.Println("-------")
		fmt.Printf("Current sum= %d\n", sum)
		fmt.Printf("i= %d\n", x)
		sum += x
		fmt.Printf("New sum= %d\n", sum)
		fmt.Println("-------")
		return sum
	}
}

func ClosuresLearning() {
	pos := adder()
	for i := 0; i < 10; i++ {
		fmt.Println(
			pos(i),
		)
	}
}

func FibonacciLearning() func() int {
	fib_sequence := []int{0, 1}
	var last_element int
	return func() int {
		fmt.Println(fib_sequence)

		if len(fib_sequence) >= 2 {
			// Get first sum element
			sumOne := fib_sequence[len(fib_sequence)-1]
			// Get second sum element
			sumTwo := fib_sequence[len(fib_sequence)-2]
			fmt.Println(sumOne)
			fmt.Println(sumTwo)
			// sum them up
			last_element = sumOne + sumTwo
			fib_sequence = append(fib_sequence, last_element)
		}
		last_element = fib_sequence[len(fib_sequence)-1]
		return last_element
	}
}