Stack implementation using array

stack_array.go

package main

import "fmt"

type Stack struct {
	data []int
}

func (s *Stack) Push(element int) {
	s.data = append(s.data, element)
}

func (s *Stack) Pop() {
	s.data = s.data[:len(s.data)-1]
}

func (s *Stack) Peek() int {
	return s.data[len(s.data)-1]
}

func (s *Stack) Lookup(pos int) int {
	return s.data[pos]
}

func (s *Stack) Display() {
	for _, v := range s.data {
		fmt.Printf(" %d ->", v)
	}
	fmt.Println()
}

func main() {
	s := Stack{}

	s.Push(1)
	s.Push(2)
	s.Push(3)
	s.Display()
	s.Pop()
	s.Display()
	fmt.Println(s.Peek())
	fmt.Println(s.Lookup(0))
}