are to copy and to extend (append), with "slicing" being common enough that
Design principles
。下载安装 谷歌浏览器 开启极速安全的 上网之旅。是该领域的重要参考
再有就是闷，时间长了没意思：船上没啥大型娱乐设施，有人调侃“哪怕放几台PS5都超级可玩”，但偏偏没有。
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arr[j + 1] = arr[j]; // 元素后移