What are some examples of async iteration in JavaScript?

What are some examples of async iteration in JavaScript?

Async iteration in JavaScript allows you to work with asynchronous data sources using the for await...of loop. For example, you can iterate over an async generator.

Can you show me a code example of an async generator?

Sure! Here's a simple async generator:

async function* asyncGenerator() {
    for (let i = 0; i < 5; i++) {
        await new Promise(resolve => setTimeout(resolve, 1000)); // Simulate async operation
        yield i;
    }
}

(async () => {
    for await (const value of asyncGenerator()) {
        console.log(value);
    }
})();

What happens if I try to use a regular for...of loop with an async generator?

Using a regular for...of loop with an async generator will throw an error because for...of is not designed to handle promises. You need to use for await...of instead.

Are there any built-in async iterable objects in JavaScript?

Yes, the ReadableStream and AsyncIterableIterator are examples of built-in async iterable objects in JavaScript.