Async Iterators
Explore the concept of async iterators in Node.js and how they enable asynchronous iteration over data sources such as HTTP requests and database queries. Learn to implement async iterators using the async function next() method and the for await of loop to handle asynchronous control flow effectively.
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The iterators we’ve seen so far return a value synchronously from their next() method. However, in JavaScript and especially in Node.js, it’s very common to have iterations over items that require an asynchronous operation to be produced.
Imagine, for example, to iterate over the requests received by an HTTP server, over the results of an SQL query, or over the elements of a paginated REST API. In all those situations, it’d be handy to be able to return a promise from the next() method of an iterator, or even better, use the async/await construct.
Well, that’s exactly what async iterators are; they’re iterators returning a promise, and since that’s the only extra requirement, it means that we can also use an async function to define the ...