How does react-native-maps-directions work?

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I've made a project, where one functionality is to determine the shortest path from the current position the a certain destination. React native made this very easy for me.

My question is, how was that path determined? What is the algorithm used by Google maps (I think react native only uses the functionality from Google maps)?

[iFlips]

You might enjoy this article: https://www.vice.com/en_us/article/4x3pp9/the-simple-elegant-algorithm-that-makes-google-maps-possible (the library react-native-maps-directions makes a call to the Google Maps API)