There are many other frameworks that make it easy to use asynchronous code, such as Combine, RxSwift, PromiseKit and so on. They use other approaches that have some drawbacks:

There are many other frameworks that make it easy to use asynchronous code, such as Combine, RxSwift, PromiseKit and so on.**They use other approaches** that have some drawbacks:

- Similar to callbacks, you also need to create chained calls, that’s why you can’t normally use loops, exception handling, etc.

- Usually you need to learn a complex new API with hundreds of methods.

The[async/await](https://en.wikipedia.org/wiki/Async/await) pattern is an alternative that allows an asynchronous, non-blocking function to be structured in a way similar to an ordinary synchronous function.

It is already well-established in other programming languages and is an evolution in asynchronous programming. The implementation of this pattern is possible thanks to coroutines.

It is already well-established in other programming languages and is an evolution in asynchronous programming. The implementation of this pattern is possible thanks to[coroutines](https://en.wikipedia.org/wiki/Coroutine).

Let’s have a look at the example with coroutine inside of which`await()` suspends it and resumes when the result is available without blocking the thread.