Question 1

How to install Then with Swift Package Manager?

Accepted Answer

Add it via Xcode: Go to File > Swift Packages > Add Package Dependency, then paste the URL https://github.com/freshOS/Then. The README notes this is now the only supported method, with others deprecated.

Question 2

Then vs PromiseKit: which is better for Swift?

Accepted Answer

Then focuses on a concise, English-like API with helpers like race and recover, while PromiseKit has a larger ecosystem and longer track record. Choose Then for readability and freshOS integration, or PromiseKit for maturity and community support.

Question 3

How to handle errors in Then promises?

Accepted Answer

Use onError blocks in chains to catch errors, or leverage recover for fallbacks. The README shows examples like .recover(with: 12) or bridging errors to custom types with .bridgeError.

Question 4

Can Then be used with SwiftUI?

Accepted Answer

Yes, it's compatible with SwiftUI as a pure Swift library, but you'll need to manage async state updates carefully, possibly using Combine or other patterns for UI binding since it doesn't provide direct SwiftUI integrations.

Question 5

How to convert callback-based code to Then promises?

Accepted Answer

Wrap callbacks in a Promise initializer: return Promise { resolve, reject in ... }, then replace nested callbacks with .then chains. The README provides a fetchUserId() example demonstrating this.

Question 6

Is Then still maintained for Swift 5.5 and above?

Accepted Answer

The README lists support up to Swift 5.1.3, but with native async/await in Swift 5.5+, maintenance might slow as the library's features become less critical. Check GitHub for recent updates.

then

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