hello-algo/codes/go/chapter_stack_and_queue/array_stack.go

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// File: array_stack.go
// Created Time: 2022-11-26
// Author: Reanon (793584285@qq.com)
package chapter_stack_and_queue
import (
"fmt"
"strconv"
"strings"
)
// ArrayStack 基于数组实现的栈
type ArrayStack struct {
data []int // 数据
}
func NewArrayStack() *ArrayStack {
return &ArrayStack{
// 设置栈的长度为 0容量为 16
data: make([]int, 0, 16),
}
}
// Size 栈的长度
func (s *ArrayStack) Size() int {
return len(s.data)
}
// IsEmpty 栈是否为空
func (s *ArrayStack) IsEmpty() bool {
return s.Size() == 0
}
// Push 入栈
func (s *ArrayStack) Push(v int) {
// 切片会自动扩容
s.data = append(s.data, v)
}
func (s *ArrayStack) Pop() any {
// 弹出栈前,先判断是否为空
if s.IsEmpty() {
return nil
}
val := s.Peek()
s.data = s.data[:len(s.data)-1]
return val
}
func (s *ArrayStack) Peek() any {
if s.IsEmpty() {
return nil
}
val := s.data[len(s.data)-1]
return val
}
func (s *ArrayStack) Print() {
fmt.Println(s.toString())
}
func (s *ArrayStack) toString() string {
var builder strings.Builder
if s.IsEmpty() {
return "empty stack"
}
for i := len(s.data) - 1; i > 0; i-- {
builder.WriteString(strconv.Itoa(s.data[i]) + " -> ")
}
builder.WriteString(strconv.Itoa(s.data[0]))
return builder.String()
}