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// File: array_stack.go
// Created Time: 2022-11-26
// Author: Reanon (793584285@qq.com)
package chapter_stack_and_queue
/* 基于数组实现的栈 */
type arrayStack struct {
data [ ] int // 数据
}
/* 初始化栈 */
func newArrayStack ( ) * arrayStack {
return & arrayStack {
// 设置栈的长度为 0，
data : make ( [ ] int , 0 , 16 ) ,
}
}
/* 栈的长度 */
func ( s * arrayStack ) size ( ) int {
return len ( s . data )
}
/* 栈是否为空 */
func ( s * arrayStack ) isEmpty ( ) bool {
return s . size ( ) == 0
}
/* 入栈 */
func ( s * arrayStack ) push ( v int ) {
// 切片会自动扩容
s . data = append ( s . data , v )
}
/* 出栈 */
func ( s * arrayStack ) pop ( ) any {
val := s . peek ( )
s . data = s . data [ : len ( s . data ) - 1 ]
return val
}
/* 获取栈顶元素 */
func ( s * arrayStack ) peek ( ) any {
if s . isEmpty ( ) {
return nil
}
val := s . data [ len ( s . data ) - 1 ]
return val
}
/* 获取 Slice 用于打印 */
func ( s * arrayStack ) toSlice ( ) [ ] int {
return s . data
}
