Async-Await: Part II

The video tutorial introduces async/await in JavaScript, highlighting its advantages over traditional promise chaining. It explains how to create async functions, use the await operator, and handle errors effectively. The tutorial emphasizes the syntactical benefits of async/await, making asynchronous code easier to read and manage. Practical examples demonstrate the integration of async/await with existing promise-based code, showcasing its application in real-world scenarios.

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

• It makes asynchronous code run faster.

• It simplifies the syntax of asynchronous code.

• It eliminates the need for promises.

• It allows JavaScript to handle synchronous tasks.

What does an async function always return?

• An array

• An object

• A promise

• A string

What is the result of an async function if no value is explicitly returned?

• A promise fulfilled with undefined

• null

• undefined

• An empty string

How can you handle the result of a promise returned by an async function?

• Using a conditional statement

• Using a callback function

• Using the then method

• Using a loop

What is the purpose of the await operator in an async function?

• To pause the execution of the function until the promise is resolved

• To convert a promise into a callback

• To handle errors in the function

• To make the function synchronous

In the context of async/await, what does the await keyword do?

• It resolves a promise immediately

• It pauses the function execution until the promise is settled

• It handles errors in the promise

• It converts a promise into a synchronous function

What happens if an error is thrown inside an async function?

• The function returns undefined

• The error is ignored

• The function continues execution

• The promise is rejected

How does async/await improve code readability compared to promise chaining?

• By eliminating the need for error handling

• By allowing asynchronous code to be written in a synchronous style

• By making the code run faster

• By reducing the number of lines of code

What is a common issue with promise chaining that async/await addresses?

• Difficulty in handling multiple promises

• Lack of support for error handling

• Increased execution time

• Complexity in maintaining the same scope for variables

Why is async/await considered a significant improvement over callbacks?

• It eliminates the need for promises

• It automatically handles all errors

• It provides a cleaner and more readable syntax

• It allows for parallel execution of tasks