JavaScript Masterclass - Zero to Job-Ready with Hands-On Projects - Async and Await / 187

The video tutorial explains the concepts of async and await in JavaScript, focusing on how to create asynchronous functions using the async keyword and handle promises with the await keyword. It provides a practical example of using these concepts to manage data flow, emphasizing the importance of waiting for promises to resolve before proceeding. The tutorial also covers error handling using try and catch blocks, ensuring robust code execution. The video concludes with a preview of handling APIs using these techniques.

What is the primary purpose of the 'async' keyword in JavaScript?

• To handle errors in functions

• To create asynchronous functions

• To pause the execution of a function

• To create synchronous functions

Which keyword is used to pause the execution of a function until a promise is resolved?

• await

• async

• pause

• stop

Why is it important to use 'await' only with functions that return a promise?

• Because it prevents errors in non-promise functions

• Because it ensures the function is synchronous

• Because it pauses execution until the promise is settled

• Because it speeds up the function execution

What analogy is used to explain the sequence of operations in async/await?

• A book reading sequence

• A social media platform

• A cooking recipe

• A car assembly line

In the context of async/await, what is the role of the 'try' block?

• To log errors to the console

• To execute code that might throw an error

• To reject promises

• To catch errors and handle them

What happens when a promise is rejected in a try block?

• The code execution stops immediately

• The error is caught in the catch block

• The promise is automatically resolved

• The error is ignored

What should you be careful about when passing messages in a reject argument?

• The message should be an object

• The message can be any type of data

• The message should be a string

• The message should be a number