// Package stack implements a simple LIFO Stack for generic values package stack // Stack contains a generic value type Stack []interface{} // NewStack returns a new Stack func NewStack() Stack { return Stack{} } // Push generic value into Stack func (s *Stack) Push(v interface{}) { *s = append(*s, v) } // Pop generic value from Stack func (s *Stack) Pop() (v interface{}) { if size := len(*s); size >= 1 { v, *s = (*s)[size-1], (*s)[:size-1] } return v } // Peek returns top value from Stack func (s Stack) Peek() interface{} { return s[len(s)-1] } // Depth returns actual size of Stack func (s Stack) Depth() int { return len(s) } // Swap swapes two top values func (s Stack) Swap() { if size := len(s); size >= 2 { s[size-1], s[size-2] = s[size-2], s[size-1] } }