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Matching Blood Donors by GPS: The Geospatial Query Design Behind GeoBlood

The naive version, and exactly how it fails Every geospatial feature starts life like this: ` js // do not ship this const donors = await Donor.find({ bloodType: 'B-', isAvailable: true }); const…

  • Naive approach scans entire collection, poor performance with growing registry
  • Ignores multiple blood types, matches only single type
  • Sorts by proximity and stops, may miss most suitable donor

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