Async Await is a great way to simplify asynchronous code and make it easier to read and understand. It also helps to reduce the amount of code that needs to be written, as the asynchronous components are handled automatically. Async Await is becoming increasingly popular and is now supported by all major browsers.
Benefits of Using Async Await
The benefit of using Async Await is that it makes writing asynchronous code easier. The code is easier to read, because it appears to be synchronous code and can be written as a single block of code, instead of having multiple lines of callback functions. It also simplifies error handling, because errors can be handled using traditional try-catch blocks instead of having to handle and propagate errors through callbacks.
Async Await also lends itself to simpler debugging, because the stack trace is easy to read. Additionally, it’s easy to keep track of where the code is in its execution, because you don’t have to think about when callbacks will fire or what value will be passed. Finally, Async Await can improve performance because it allows for more efficient use of time by letting asynchronous operations run in parallel, so that you don’t have to wait for each function to finish before continuing.
Another benefit of using Async Await is that it allows for better code organization. By using Async Await, you can break up your code into smaller, more manageable chunks, which makes it easier to debug and maintain. Additionally, it can help reduce the amount of code you need to write, since you don’t have to write multiple lines of callback functions.
Writing an Async Await Function
An async function is denoted by using the keyword async before the function keyword. This signals to the browser that this is an asynchronous function. Your return value within an async function must be either a promise or a value. A promise is returned when an asynchronous operation needs to occur, while a value is returned when a synchronous task has finished.
An await keyword is used within an async function to pause execution and wait for an asynchronous operation to complete. The await keyword must be preceded by the keyword async. The keyword await can only be used inside an async function. This means that if you are writing code inside a regular function, you must wrap it in an async function.
When using the await keyword, it is important to remember that the code will not continue to execute until the asynchronous operation has completed. This means that if you are waiting for a response from an API, your code will not continue until the response has been received. This can be beneficial in some cases, as it allows you to ensure that all of the necessary data has been received before continuing with the code.
Error Handling with Async Await
It is important to note that errors thrown within an async function will not be caught by the try-catch block, and must be handled separately. Additionally, errors thrown within an async function can be handled by using the .catch() method, which allows you to specify a callback function to be executed when an error is thrown.
How Async Await Improves Performance
Another way that Async Await improves performance is by allowing for more efficient use of time. By using Async Await, you can start multiple asynchronous operations in parallel and handle them all without having to wait for each operation to finish before continuing with the next one.
Async Await also helps to reduce the amount of code that needs to be written. By using Async Await, you can write code that is more concise and easier to read. This makes it easier to debug and maintain your code, which can lead to improved performance.
Working with Promises and Async Await Together
Async Await can work with promises in cases where an asynchronous operation needs to start before the await keyword is used. For example, if you need to fetch data from somewhere before using it, you can wrap your fetch call in a promise and then wait for it to resolve before awaiting it. Alternatively, you can directly use promises inside an async function by wrapping them in an await statement.
It is important to note that when using promises and async await together, the promise must be resolved before the await keyword is used. If the promise is not resolved, the await keyword will not work and the code will not execute as expected. Additionally, it is important to ensure that the promise is properly handled and any errors are caught and handled appropriately.