Question 1

How do I chain multiple async operations with Google Promises?

Accepted Answer

Use the `then` method to sequentially chain promises, allowing each operation to depend on the previous result. The README's Basics section provides examples for creating and observing promises to avoid nested callbacks.

Question 2

Google Promises vs Combine: which is better for iOS development?

Accepted Answer

Promises is focused on structured async task management with a simpler API, while Combine is a reactive framework for handling streams of values. Choose Promises for straightforward async chains, and Combine for event-driven data flows with publishers and subscribers.

Question 3

How to implement retry logic for a network request using Promises?

Accepted Answer

Use the `retry` extension to automatically retry a failed promise a specified number of times. This is useful for unreliable operations like network calls, and it's documented in the Extensions section of the README.

Question 4

Can I use Promises with both Swift and Objective-C in the same app?

Accepted Answer

Yes, Promises is designed for full interoperability, allowing you to create promises in Objective-C and consume them in Swift, or vice versa. The README covers this in the Objective-C <-> Swift interoperability section.

Question 5

What are the performance costs of using Google Promises?

Accepted Answer

Promises adds minimal overhead compared to manual dispatch queue management, but it involves some memory and CPU usage for promise objects. The README's Benchmark section provides details, showing it's efficient for typical async workloads.

Question 6

How to handle errors in Promises without breaking the chain?

Accepted Answer

Use the `catch` method to observe rejections and handle errors gracefully, allowing the chain to continue or recover. The README explains error propagation in the Observing rejection section, with examples for cleanup or fallback actions.

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