I built a Tic-Tac-Toe game with vanilla JavaScript, HTML5, and CSS. Writing code for a console is simple. Building logic for a user interface is different. It requires you to think about how a player ...

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Where it actually runs (it's not just an interview problem): → Google Maps & GPS — fastest route, recalculated live → Internet routing — OSPF picks the path your packets take → Flights & transit — ...