Firebase creates lexicographically ordered random-looking UUIDs so you can always check relative entry order: https://firebase.googleblog.com/2015/02/the-2120-w

Firebase creates lexicographically ordered random-looking UUIDs so you can always check relative entry order: https://firebase.googleblog.com/2015/02/the-2120-ways-to-ensure-unique_68.html https://firebase.googleblog.com/2015/02/the-2120-ways-to-ens...