Firebase

Question 1

How are arrays handled in Firebase?

Answer 1

Automatic numeric indexing does not work in Firebase on the server. Firebase array elements have uniquely generated keys.

Question 2

What are null locations?

Answer 2

If you navigate to a node/url where data doesn’t exist Firebase returns a null value

Question 3

What are Firebase refs?

Answer 3

var url = "www.someurl.com";
var baseRef = new Firebase(url);

Question 4

What does a child ref look like?

Answer 4

var url = "www.someurl.com";
var moviesRef = new Firebase(url + "movies/");
var starWarsRef = moviesRef.child("star_wars");

Question 5

What are data design principles for Firebase?

Answer 5

• use root branches as containers
• avoid deep nesting; requesting a URL brings back all data underneath a node
• duplicate key data in objects to avoid lookups