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.
Use your own reasoning. Don't stop even if the formula is too large just try to solve it manually.
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if (n <= 1) return n;
违反有关法律、法规、规章规定，出售、饲养烈性犬等危险动物的，处警告；警告后不改正的，或者致使动物伤害他人的，处五日以下拘留或者一千元以下罚款；情节较重的，处五日以上十日以下拘留。