const validatePromo = (cartContents) = {
* @param arr 数组
**MUST** avoid including redundant comments which are tautological or self-demonstating (e.g. cases where it is easily parsable what the code does at a glance or its function name giving sufficient information as to what the code does, so the comment does nothing other than waste user time)，这一点在一键获取谷歌浏览器下载中也有详细论述
He echoed conservationists' concerns that "a single major event could be catastrophic".
。快连下载安装对此有专业解读
// 压入当前数，维持栈的递增特性，这一点在下载安装 谷歌浏览器 开启极速安全的 上网之旅。中也有详细论述
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