React JS Masterclass - Go From Zero To Job Ready - Snapshots / 258

The lecture discusses the use of the onSnapshot method in Firebase to automatically update data in real-time when changes occur, such as adding or deleting movies. It explains how to use onSnapshot to access and manipulate data, create a movie array, and log changes. The lecture also highlights the snapshot callback function and previews the next lecture on querying and filtering data.

What is the primary purpose of using snapshots in Firebase?

• To create static data arrays

• To delete data from the database

• To automatically update data when changes occur

• To manually refresh the database

How does the onsnapshot method differ from get docs?

• It requires manual invocation

• It does not support real-time updates

• It automatically updates on data changes

• It only works with static data

What is the role of the second argument in the onsnapshot method?

• To specify the database URL

• To define the callback function for data changes

• To limit the number of documents retrieved

• To set the data refresh interval

What is the purpose of using the forEach method with onsnapshot?

• To refresh the entire database

• To create a new database collection

• To iterate over and manipulate each document

• To delete documents from the database

What is the benefit of creating an array with document data in onsnapshot?

• To store static data permanently

• To easily manipulate and display updated data

• To delete data from the database

• To prevent data changes

What is a potential alternative to using onsnapshot for data updates?

• Manually refreshing the page

• Converting it into a function and calling it on changes

• Using static arrays

• Using a different database

What will be covered in the next lecture following this one?

• How to create new collections

• How to use static data arrays

• How to query and filter data

• How to delete data from Firebase