You might assume this pattern is inherent to streaming. It isn't. The reader acquisition, the lock management, and the { value, done } protocol are all just design choices, not requirements. They are artifacts of how and when the Web streams spec was written. Async iteration exists precisely to handle sequences that arrive over time, but async iteration did not yet exist when the streams specification was written. The complexity here is pure API overhead, not fundamental necessity.
2. 分区：小于pivot的放左边，大于的放右边
"dispense cash" command. Any user input, such as reading a card or entry of a
Paige, 27, who works for the ambulance service, said her "anxiety levels are definitely through the roof" when she leaves her dogs at home in the day.