The Complete React Developer Course (with Hooks and Redux) - Fetching Data from Firebase

The Complete React Developer Course (with Hooks and Redux) - Fetching Data from Firebase

Assessment

Interactive Video

•

Information Technology (IT), Architecture

•

University

•

Practice Problem

•

Hard

Created by

Wayground Content

FREE Resource

This video tutorial covers how to fetch data from Firebase using two main methods: fetching data once with the 'once' method and setting up subscriptions with the 'on' method. It explains how to handle data changes and unsubscribe from them using the 'off' method. The tutorial includes a practical challenge to reinforce learning and concludes with a summary of the key concepts.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the two main methods to fetch data from Firebase discussed in the video?

Fetching data using REST API and GraphQL

Fetching data once and setting up a subscription

Using SQL queries and NoSQL queries

Using local storage and session storage

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which method is used to fetch data from Firebase a single time?

fetch

once

on

get

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the 'once' method return when fetching data?

A promise

A synchronous result

A callback function

An observable

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why are promises not suitable for handling data changes in real-time?

They require too much memory

They do not support asynchronous operations

They are too slow

They can only be resolved or rejected once

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which method allows you to listen for data changes over and over again?

fetch

once

on

listen

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of the 'off' method in Firebase?

To fetch data once

To unsubscribe from data changes

To delete data

To update data

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can you unsubscribe from a specific subscription in Firebase?

By passing the subscription ID to 'off'

By passing the exact same function to 'off'

By calling 'unsubscribe' method

By deleting the reference

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