Async/await is a feature introduced in ES2017 that simplifies the handling of asynchronous operations in JavaScript. It allows developers to write asynchronous code that looks and behaves like synchronous code, making it easier to read and write.
The basic idea behind async/await is to use the async keyword to mark a function as asynchronous and the await keyword to pause the execution of the function until an asynchronous operation is complete. When an async function is called, it returns a promise that resolves to the return value of the function.
Here's an example that demonstrates how async/await can be used to simplify the handling of asynchronous code:
In this example, the getData() function is marked as async, which means it returns a promise. The function makes an asynchronous HTTP request to the JSONPlaceholder API using the fetch() function. The await keyword is used to pause the execution of the function until the response is received. Once the response is received, the data is parsed using the response.json() method, and the resulting data is logged to the console.
Here's another example that demonstrates how async/await can be used to simplify the handling of asynchronous code:
In this example, the doTasks() function is marked as async and performs three asynchronous tasks in sequence using the await keyword. The function returns a promise that resolves to the result of the third task. The promise is handled using the then() method, which logs the result to the console.
One important thing to keep in mind when using async/await is error handling. Since async/await makes asynchronous code look and behave like synchronous code, errors can be handled using try/catch blocks, just like with synchronous code.
Here's an example that demonstrates how to handle errors with async/await:
In this example, a try/catch block is used to handle any errors that may occur during the execution of the async function. If an error occurs, it is caught and logged to the console using console.error().
Overall, async/await is a powerful feature that simplifies the handling of asynchronous code in JavaScript. By making asynchronous code look and behave like synchronous code, async/await makes it easier to read and write, and reduces the likelihood of errors.
Thanks for reading and learning!