Full Stack Web Development MASTERY Course - Novice to Expert - Promises in JavaScript

Full Stack Web Development MASTERY Course - Novice to Expert - Promises in JavaScript

Assessment

Interactive Video

Information Technology (IT), Architecture

University

Practice Problem

Hard

Created by

Wayground Content

FREE Resource

This video tutorial introduces JavaScript promises, explaining their role in handling asynchronous operations. It covers the limitations of callbacks, the states of promises, and provides a practical example of creating and handling promises using resolve and reject. The tutorial concludes with the advantages of using promises over callbacks, highlighting improved error handling and code readability.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary purpose of promises in JavaScript?

To handle synchronous operations

To manage asynchronous operations

To replace all functions

To simplify variable declarations

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is NOT a state of a JavaScript promise?

Pending

Fulfilled

Rejected

Completed

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the 'resolve' function signify in a promise?

The promise is rejected

The promise is fulfilled

The promise is undefined

The promise is pending

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the context of promises, what does the 'reject' function indicate?

The promise is pending

The promise is undefined

The promise is fulfilled

The promise is rejected

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the role of the setTimeout function in the promise example?

To simulate an asynchronous operation

To reject the promise instantly

To handle synchronous operations

To immediately resolve the promise

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What message is displayed if the promise operation is successful?

Promise operation was unsuccessful

No thanks

Mission failed

Promise operation is successful

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the 'then' method do in a promise?

It is called when the promise is undefined

It is called when the promise is pending

It is called when the promise is rejected

It is called when the promise is fulfilled

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