How do I implement async iterators in JavaScript?

How do I implement async iterators in JavaScript?

To implement async iterators in JavaScript, you can define an object with a Symbol.asyncIterator method that returns an object with a next method.

Can you show me a simple example?

Sure! Here's a basic example:

const asyncIterable = {
  [Symbol.asyncIterator]() {
    let count = 0;
    return {
      next() {
        if (count < 5) {
          return Promise.resolve({ value: count++, done: false });
        }
        return Promise.resolve({ done: true });
      }
    };
  }
};

(async () => {
  for await (const num of asyncIterable) {
    console.log(num);
  }
})();

What does the for await...of loop do?

The for await...of loop is used to iterate over async iterators, allowing you to handle asynchronous data in a synchronous-like manner.

Are there any use cases for async iterators?

Yes, async iterators are useful for handling streams of data, such as reading files, making API calls, or processing data from databases asynchronously.