package main

import "fmt"

func SlicesIndex[S []E, E int](s []string, v string) int {
	for i := range s {
		if v == s[i] {
			return i
		}
	}
	return -1
}

type List struct {
	head, tail *element
}

type element struct {
	next *element
	val  int
}

func (lst *List) Push(v int) {
	if lst.tail == nil {
		lst.head = &element{val: v}
		lst.tail = lst.head
	} else {
		lst.tail.next = &element{val: v}
		lst.tail = lst.tail.next
	}
}

func (lst *List) AllElements() []int {
	var elems []int
	for e := lst.head; e != nil; e = e.next {
		elems = append(elems, e.val)
	}
	return elems
}

func main() {
	var s = []string{"foo", "bar", "zoo"}

	fmt.Println("index of zoo:", SlicesIndex(s, "zoo"))

	lst := List{}
	lst.Push(10)
	lst.Push(13)
	lst.Push(23)
	fmt.Println("list:", lst.AllElements())
}