Full Stack Web Development MASTERY Course - Novice to Expert - Async / Await in JavaScript

The video tutorial explains JavaScript's async and await keywords, which simplify asynchronous programming by making code appear synchronous. It covers the syntax and usage of both keywords, providing examples to illustrate their functionality. The tutorial also highlights the benefits of using async/await, such as easier debugging, simpler error handling, and more readable code compared to traditional promises.

What is the primary advantage of using async/await over promises?

• It eliminates the need for error handling.

• It allows writing asynchronous code in a synchronous manner.

• It is compatible with all browsers.

• It makes the code run faster.

Which browser is recommended for understanding async/await?

• Safari

• Internet Explorer

• Mozilla Firefox

• Google Chrome

What does the async keyword indicate when used with a function?

• The function is deprecated.

• The function does not return any value.

• The function is asynchronous and returns a promise.

• The function is synchronous.

In the example provided, what does the function 'fun' return?

• A promise.

• An integer value.

• A string value.

• An array.

What is the role of the await keyword in an async function?

• It pauses the function until a promise is resolved or rejected.

• It converts the function into a synchronous one.

• It speeds up the execution of the function.

• It handles errors automatically.

What happens when you prepend await to a function call?

• The function call is skipped.

• The code execution continues without waiting.

• The code execution stops until the promise is resolved.

• The function call is repeated.

In the advanced example, what is the purpose of setTimeout?

• To immediately resolve a promise.

• To convert a promise into a synchronous function.

• To reject a promise after a delay.

• To delay the resolution of a promise.

What is one of the benefits of using async/await mentioned in the lecture?

• It makes error handling more complex.

• It simplifies error handling.

• It requires more lines of code.

• It is not supported in any browsers.

How does async/await improve code readability?

• By making asynchronous code look like synchronous code.

• By using fewer keywords.

• By eliminating the need for comments.

• By using more complex syntax.

What is a common issue with debugging promises that async/await helps solve?

• Debuggers cannot step over asynchronous code easily.

• Promises are too fast to debug.

• Promises are not compatible with modern browsers.

• Promises do not support error handling.