Javascript Async Functions

Javascript async functions

Created By: chatGPT

In JavaScript, async functions provide a way to work with promises more conveniently. An async function is a function declared with the async keyword, and it ensures that the function always returns a promise. If the return value is not already a promise, it gets wrapped in a resolved promise. This allows for a more synchronous style of code when dealing with asynchronous operations.

async function fetchData() {
    return 'Data fetched';
}

To handle values returned by an async function, you can use the await keyword. The await expression pauses the execution of the async function and waits for the promise to be resolved. It can only be used inside async functions.

async function getData() {
    let data = await fetchData();
    console.log(data);
}

It's essential to handle errors correctly when working with async/await. You can use try...catch blocks to manage any errors that might be thrown during the execution of the asynchronous code.

async function fetchWithErrorHandling() {
    try {
        let data = await fetchData();
        console.log(data);
    } catch (error) {
        console.error('Error fetching data:', error);
    }
}

When working with multiple async operations, you can use Promise.all() to wait for all promises to resolve. This method returns a single promise that resolves when all of the promises in the iterable have resolved, or rejects if any promise is rejected.

async function fetchMultipleData() {
    const promises = [fetchData(), fetchData()];
    try {
        const results = await Promise.all(promises);
        console.log('All data fetched:', results);
    } catch (error) {
        console.error('Error fetching data:', error);
    }
}

Lastly, keep in mind that using async functions can help you avoid the infamous callback hell, making your code cleaner and easier to read. They provide a powerful way to handle asynchronous JavaScript programming with a more consistent flow.

// Example of using async functions in practice
async function main() {
    await fetchMultipleData();
}

main();