title: Using Geofences with React Native
body: <p>I found this plugin: <em><a href="https://www.npmjs.com/package/react-native-geo-fencing" rel="nofollow noreferrer">react-native-geo-fencing</a></em></p>
  <p>That will basically take your longitude and latitude and determine if you are in the polygon, but say you have 100 different polygons. It seems to result in really poor performance to loop through all those until you find the polygon you are in.</p>
  <p>Is there a more elegant way to do this?</p>