Implementing Infinite Scroll (Lazy Loading) With FlatList Using React Native + Firebase Cloud Firestore

Notes: Infinite Scroll allows your app to query/retrieve data as needed. What that means is when a user scrolls down to the bottom of the list, an additional query is made and the data is appended. There are isn't a "Load More" or "Next Page" button, the query is automatically made in the background, which is where the name infinite scroll comes from.