// Async — when source or transforms may be asynchronous
谁也无法断言未来，但颠覆发生之前，我们依然需要一台更好用的手机。
，详情可参考51吃瓜
// 从后向前扫描，大于key的元素后移
Offline navigation is a lifeline for travelers, adventurers, and everyday commuters. We demand speed, accuracy, and the flexibility to tailor routes to our specific needs. For years, OsmAnd has championed powerful, feature-rich offline maps that fit in your pocket. But as maps grew more detailed and user demands for complex routing increased, our trusty A* algorithm, despite its flexibility, started hitting a performance wall. How could we deliver a 100x speed boost without bloating map sizes or sacrificing the deep customization our users love?
ITmedia �r�W�l�X�I�����C���̍ŐV���������͂�