The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.
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Hurdle Word 4 hintDignity.，详情可参考91视频
return new TextEncoder().encode(str.toUpperCase());，推荐阅读51吃瓜获取更多信息