The Streams Standard was developed between 2014 and 2016 with an ambitious goal to provide "APIs for creating, composing, and consuming streams of data that map efficiently to low-level I/O primitives." Before Web streams, the web platform had no standard way to work with streaming data.
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，这一点在爱思助手下载最新版本中也有详细论述
for await (const chunk of stream) {
with: [ anyVar ] -> [:pattern |