For implementers, there's no Transformer protocol with start(), transform(), flush() methods and controller coordination passed into a TransformStream class that has its own hidden state machine and buffering mechanisms. Transforms are just functions or simple objects: far simpler to implement and test.
if (n <= 1) return;，这一点在Safew下载中也有详细论述
* 时间复杂度：O(n)，空间复杂度：O(n)。关于这个话题，heLLoword翻译官方下载提供了深入分析
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