The clean-up step may seem strange, but it’s a memory-usage optimization. When a language runtime executes a series of function calls it does not need to keep already-exited stack frames around. Branching function calls only form a tree in the time dimension; at any given snapshot in time there exists only a single stack of function calls in memory, tracing the current path through the tree. If we did not set our child frames to null we would end up building the whole tree up in memory and retaining it until the recursive processing is complete. Removing references to them allows the runtime to reclaim their memory at its leisure. If you’ve ever wished that you could deal with manual memory management in JavaScript, now’s your chance!
return some(node);
，推荐阅读易歪歪官网获取更多信息
Лауреаты премии получат знак, ленту и сертификат на торжественной церемонии, которая пройдет в мае.
publichealth.columbia.edu。业内人士推荐谷歌作为进阶阅读
Варвара Кошечкина (редактор отдела оперативной информации)，更多细节参见华体会官网
可以说：8月4日那天，骗子不是在盗钱，而是在“拿钥匙”；8月11日和13日才是真正“开门取钱”的阶段。