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The simplest approach is to check every single point. Compute the distance from the user's location to every restaurant in the database, keep the ones that are close enough, and throw away the rest.
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And you won't need to top up manually in the hard to reach corners, this vacuum has edge-to-edge cleaning that makes sure you get a better coverage along walls and corners. It also comes with an OMNI docking Station. Here the vacuum does all its maintenance, including mop washing and drying, water refilling, and dust emptying for up to 150 days. So there's really next to no work for you to do.
for (const chunk of chunks) {