Stack implementation in Go

stack.go

type stack struct { //use a struct to define the stack
	data []int
}

func (s *stack) pop() int {
	popped := s.data[len(s.data)-1]
	s.data = s.data[:len(s.data)-1] //resize the internal slice
	return popped
}

func (s *stack) push(item int) {
	s.data = append(s.data, item)
}

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