How does asynchronous array iteration work in JavaScript?

How does asynchronous array iteration work in JavaScript?

Asynchronous array iteration allows you to process elements of an array without blocking the execution of other code. This is often done using methods like forEach, map, or reduce in combination with async/await.

Can you give me an example of using async/await with array iteration?

Sure! Here's a simple example:

const fetchData = async (url) => {
    const response = await fetch(url);
    return response.json();
};

const urls = ['url1', 'url2', 'url3'];

const processUrls = async () => {
    for (const url of urls) {
        const data = await fetchData(url);
        console.log(data);
    }
};

processUrls();

What happens if I use a regular for loop instead?

If you use a regular for loop without await, the requests will be sent out simultaneously, which can lead to performance issues or rate limiting. Using await ensures that each request completes before the next one starts.

Are there any performance considerations I should be aware of?

Yes, using async/await can lead to better readability, but if you have many asynchronous operations, consider using Promise.all() to run them concurrently for better performance.