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.
I'm not saying any of this through any sort of Apple-loving bias. I typically use a MacBook Pro for work, but I'm a Windows user at heart. Windows was my gateway to computing in the '90s, back when Macs were far more expensive than PCs. These days, I spend more time on my Windows desktop making podcasts, playing PC games and bumming around the internet than I do working on Macs.
。关于这个话题，safew官方版本下载提供了深入分析
If a player gets all four words in a set correct, those words are removed from the board. Guess wrong and it counts as a mistake—players get up to four mistakes until the game ends.
Not Equal: Everything in this space must be different. The answer is 2-2, placed horizontally; 4-4, placed vertically; 0-0, placed vertically.