Mobile apps have to permanently deal with asynchronous events - notifications, network status, database updates, user input, and more. The way how we have dealt with asynchronous events has changed significantly over time - from callback delegates to closures, and now AsyncSequence.

In this talk, we will take a deep dive into how AsyncStream works, how to use it in your apps, and how to use it to build ergonomic APIs. We will also take a trip down memory lane to understand where we’re coming from, and how asynchronous APIs have evolved over the years.

You will learn:

- All the ways to listen to asynchronous events
- How AsyncStream helps to make your apps more robust
- What’s the difference between AsyncSequence and AsyncStream
- How to use AsyncStream to implement modern APIs that are easy to use

I will provide real-world examples to explain the underlying concepts, and we’ll take a look at how the Firebase team implemented asynchronous APIs over the span of almost a decade and several iterations of Objective-C and Swift.