package main

import (
	"fmt"
)

func main() {
	vec := Vector(string){"abc", "xyz"}

	vec.ForEach(PrintString)
	
	fmt.Println(Reduce(int, string)(0, vec, CountCharacters))

	fmt.Println(vec.Reduce(int)(0, CountCharacters))
}

func PrintString(s string) { fmt.Println(s) }

func CountCharacters(acc int, s string) int { return acc + len(s) }

type Vector(type E) []E

func (v Vector(E)) ForEach(fn func(E)) {
	for _, ele := range v {
		fn(ele)
	}
}

func (v Vector(E)) Reduce(type A)(acc A, fn func(A, E) A) A {
	for _, ele := range v {
		acc = fn(acc, ele)
	}
	return acc
}

func Reduce(type A, E)(acc A, vec Vector(E), fn func(A, E) A) A {
	for _, ele := range vec {
		acc = fn(acc, ele)
	}
	return acc
}