Using Firebase and AngularFire2 in an Ionic Real-Time TODO application

tutorials
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In order to create a Real-Time application we have to be sure that the data are always consistent.
Firebase already handles this for us and that’s what we are going to use to create a Real-Time TODO mobile application with Ionic and AngularFire2!

https://www.javascripttuts.com/using-firebase-and-angularfire2-in-an-ionic-real-time-todo-application/