The Modern JavaScript Bootcamp (2019) - Async/Await

The video tutorial covers the concept of async/await in JavaScript, explaining how it simplifies working with promises. It starts with an introduction to async functions and the await operator, demonstrating their use through examples. The tutorial highlights the benefits of using async/await for handling promises, making code more readable and maintainable. It also includes practical examples and a step-by-step guide on converting existing promise-based code to async/await, emphasizing the ease of handling asynchronous operations.

What is the primary benefit of using async/await in JavaScript?

• It makes code run faster.

• It simplifies working with promises.

• It eliminates the need for error handling.

• It allows synchronous execution of code.

What does an async function always return?

• An object

• An array

• A string

• A promise

How can you handle errors in an async function?

• Using a switch statement

• Using a for loop

• Using a finally block

• Using a try-catch block

What is the role of the await operator in async functions?

• To speed up the execution of code

• To handle errors automatically

• To pause execution until a promise is resolved

• To convert synchronous code to asynchronous

In the context of async/await, what does the await operator require?

• A loop

• A callback function

• A promise

• A synchronous function

What happens if a promise is rejected when using await?

• The function returns undefined

• The promise is ignored

• An error is thrown

• The function continues execution

How does async/await improve code readability?

• By making asynchronous code look like synchronous code

• By eliminating the need for comments

• By reducing the number of lines

• By using fewer variables

What is a key advantage of using async/await over promise chaining?

• It is easier to read and maintain

• It is faster to execute

• It eliminates the need for promises

• It requires less memory

When converting a function to use async/await, what is the first step?

• Add the async keyword to the function

• Add the await keyword

• Change all variables to constants

• Remove all promises

What is the result of using async/await in terms of code structure?

• Code becomes more readable and maintainable

• Code becomes less efficient

• Code becomes more complex

• Code becomes harder to debug