Stack in Go

// Stack in Go
package main

import "fmt"

type stack []int

func (s stack) Empty() bool { return len(s) == 0 }
func (s stack) Peek() int   { return s[len(s)-1] }
func (s *stack) Put(i int)  { *s = append(*s, i) }
func (s *stack) Pop() int {
        d := (*s)[len(*s)-1]
        *s = (*s)[:len(*s)-1]
        return d
}

func main() {
        var s stack

        for i := 0; i < 3; i++ {
                s.Put(i)
                fmt.Printf("len=%d\n", len(s))
                fmt.Printf("peek=%d\n\n", s.Peek())
        }

        for !s.Empty() {
                i := s.Pop()
                fmt.Printf("len=%d\n", len(s))
                fmt.Printf("pop=%d\n\n", i)
        }
}