数组的 Array.prototype.forEach() 虽然方便,但默认只能从左向右遍历。当需要倒序处理数组元素时,常见的思路是使用 for 循环,但更优雅的做法是利用 Array.prototype.slice()、Array.prototype.reverse() 与 Array.prototype.forEach() 的组合,一步完成“不修改原数组的逆序遍历”。
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