How do async iterators compare in performance to traditional iterators?

How do async iterators compare in performance to traditional iterators?

Async iterators are designed for handling asynchronous data streams, while traditional iterators work with synchronous data. In terms of performance, async iterators can be more efficient when dealing with I/O-bound operations, as they allow for non-blocking execution.

Can you give me an example of when to use async iterators?

Sure! If you're fetching data from an API in a loop, using an async iterator allows you to process each response as it arrives without waiting for all requests to complete.

Are there any downsides to using async iterators?

One downside is that async iterators can introduce complexity in error handling and may not be as performant for CPU-bound tasks compared to traditional iterators.

How do I implement an async iterator in JavaScript?

You can implement an async iterator by defining an object with a next method that returns a promise. Here's a simple example:

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