Swift should I switch?

Feb 26, 20150 likes611 views

The document discusses whether Swift is ready for production use. It notes that Swift is growing in popularity and stability according to language indexes. Swift 1.2 includes improvements like faster builds and better compiler diagnostics. A new app was written in Swift for Duolingo in 3 months, and it had a low crash rate despite tooling issues. While interfacing with Objective-C and compiler bugs are still problems, the document concludes that Swift is ready for new code due to its type safety and architecture benefits. Learning functional patterns and dealing with strict typing are identified as challenges to using Swift.

@wolfgang_damm
Wolfgang Damm
CTO & Co-Founder
wolfgang@pocket-lifestyle.com
www.pocket-lifestyle.com

Current State
• TIOBE Index of language popularity
• Swift #27, increasing
• Objective-C #4, declining
• Github number of active repositories
• Swift #18, growing
• Objective-C #11, ﬂat
Data as of February 2015
http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html
http://githut.info/

Swift 1.2
• Xcode 6.3 Beta
• Faster builds & executables
• Better compiler diagnostics
• Stability
• and changes to the language!

Deferred initialisation
of let constants

Duolingo Test Center
• New App written in Swift
• 3 month 
(1 dev, design/backend inplace)
+ Value types, custom operators
+ Stronger, static type system, with
type inference
+ Generics especially for typesafe
collections

Duolingo Test Center
- Tooling: Xcode, crashes, very slow code
completion, basically no debugger, unstable/
unreliable syntax highlighting (got better)
- Swift language changes. 
Known from the beginning, in retrospect only
little time spent on keeping source up to date
- Incomprehensible compiler errors

Duolingo Test Center
• Crash rate ~0.2% (crashes/downloads) 
mostly in Objective-C third party library
• Swift eased process of building a solid
architecture. Eliminating classes of bugs by
design (e.g. Swift’s type system)

@brentsimmons
ObjC: “I am laughing out loud”
Swift: "LOL"

@brentsimmons
• Harder on 2nd look
• optionals, generics, and tuples, value vs reference
• functional design patterns
• strict type safety
• issue interoperation with Objective-C
• “Swift is happening.”

Random Thoughts from
Developers
• Common internal libraries, not rewriting just to
be Swift
• Sometimes interacting with Cocoa API’s harder
than thought
• Strict typing is a killer feature (ﬁnds bugs during
compile time)

Our take aways
• Future of iOS will be Swift
• New code written in Swift
• Rewriting only were it makes sense (lot of code changes,
restructuring)
• Know Swift AND Objective-C
• Swift uses different patterns
• Hard to follow good patterns when interfacing with
Objective-C

Experience
• Compiler bugs: crashes instead of error
• Renew Certiﬁcate, otherwise it crashes submitted
build
• At ﬁrst slower when writing code, but learning fast
• Choice between Objective-C vs Swift patterns
• Cocoapods support is still beta
• cocoapods --pre installs 1.0.36(beta)

pod 'Alamofire', :git => 'https://github.com/Alamofire/
Alamofire.git', :branch => ‘xcode-6.3'
pod 'SwiftyJSON', :git => 'https://github.com/
SwiftyJSON/SwiftyJSON.git', :branch => 'xcode6.3'

Favourite Swift Way
enum Router: URLStringConvertible {
static let baseURLString = "http://example.com"
case Root
case User(String)
case Post(Int, Int, String)
// MARK: URLStringConvertible
var URLString: String {
let path: String = {
switch self {
case .Root:
return "/"
case .User(let username):
return "/users/(username)"
case .Post(let year, let month, let title):
let slug = title.stringByReplacingOccurrencesOfString(" ", withString: "-").lowercaseString
return "/(year)/(month)/(slug)"
}
}()
return Router.baseURLString + path
}
}
Enum with associated value and computed property

Learn Swift
• Read “The Swift Programming Language” by Apple
• thatthinginswift.com
• swiftdoc.org
• learnswift.tips
• Start coding in Swift!
• github.com/raywenderlich/swift-style-guide

My experience learning
Swift
• Functional Programming is different
• Force yourself to using good practices. Make
use of strict types. Which is hard.
• Harder to deﬁne public interface (no header).
Standard access modiﬁer is internal. Also makes
testing harder.

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Tests, especially unit tests, are the developers’ superheroes. They allow us to mess around with our code and keep us safe. We often trust them with the safety of our codebase, but how do we know that we should? How do we know that this trust is well-deserved? Enter mutation testing – by intentionally injecting harmful mutations into our code and seeing if they are caught by the tests, we can evaluate the quality of the safety net they provide. By watching the watchmen, we can make sure our tests really protect us, and we aren’t just green-washing our IDEs to a false sense of security. Talk from SciFiDevCon 2025 https://www.scifidevcon.com/courses/2025-scifidevcon/contents/680efa43ae4f5

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Not So Common Memory Leaks in Java WebinarTier1 app

This SlideShare presentation is from our May webinar, “Not So Common Memory Leaks & How to Fix Them?”, where we explored lesser-known memory leak patterns in Java applications. Unlike typical leaks, subtle issues such as thread local misuse, inner class references, uncached collections, and misbehaving frameworks often go undetected and gradually degrade performance. This deck provides in-depth insights into identifying these hidden leaks using advanced heap analysis and profiling techniques, along with real-world case studies and practical solutions. Ideal for developers and performance engineers aiming to deepen their understanding of Java memory management and improve application stability.

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GitHub Actions (GA) has become the de facto tool that developers use to automate software workflows, seamlessly building, testing, and deploying code. Yet when GA fails, it disrupts development, causing delays and driving up costs. Diagnosing failures becomes especially challenging because error logs are often long, complex and unstructured. Given these difficulties, this study explores the potential of large language models (LLMs) to generate correct, clear, concise, and actionable contextual descriptions (or summaries) for GA failures, focusing on developers’ perceptions of their feasibility and usefulness. Our results show that over 80% of developers rated LLM explanations positively in terms of correctness for simpler/small logs. Overall, our findings suggest that LLMs can feasibly assist developers in understanding common GA errors, thus, potentially reducing manual analysis. However, we also found that improved reasoning abilities are needed to support more complex CI/CD scenarios. For instance, less experienced developers tend to be more positive on the described context, while seasoned developers prefer concise summaries. Overall, our work offers key insights for researchers enhancing LLM reasoning, particularly in adapting explanations to user expertise. https://arxiv.org/abs/2501.16495

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Swift should I switch?

2. @wolfgang_damm Wolfgang Damm CTO & Co-Founder [email protected] www.pocket-lifestyle.com

3. Swift Should I use it for production?

4. Current State • TIOBE Index of language popularity • Swift #27, increasing • Objective-C #4, declining • Github number of active repositories • Swift #18, growing • Objective-C #11, ﬂat Data as of February 2015 http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html http://githut.info/

5. Swift 1.2 • Xcode 6.3 Beta • Faster builds & executables • Better compiler diagnostics • Stability • and changes to the language!

6. as! for failable casts

7. if let a = a, b = b, c = c {

8. Nullability Annotations

9. enums export to Objective-C

10. Deferred initialisation of let constants

11. Set

12. So is it ready for prime time?

13. Duolingo Test Center • New App written in Swift • 3 month  (1 dev, design/backend inplace) + Value types, custom operators + Stronger, static type system, with type inference + Generics especially for typesafe collections

14. Duolingo Test Center - Tooling: Xcode, crashes, very slow code completion, basically no debugger, unstable/ unreliable syntax highlighting (got better) - Swift language changes.  Known from the beginning, in retrospect only little time spent on keeping source up to date - Incomprehensible compiler errors

15. Duolingo Test Center • Crash rate ~0.2% (crashes/downloads)  mostly in Objective-C third party library • Swift eased process of building a solid architecture. Eliminating classes of bugs by design (e.g. Swift’s type system)

16. @brentsimmons ObjC: “I am laughing out loud” Swift: "LOL"

17. @brentsimmons • Harder on 2nd look • optionals, generics, and tuples, value vs reference • functional design patterns • strict type safety • issue interoperation with Objective-C • “Swift is happening.”

18. Random Thoughts from Developers • Common internal libraries, not rewriting just to be Swift • Sometimes interacting with Cocoa API’s harder than thought • Strict typing is a killer feature (ﬁnds bugs during compile time)

19. So is it ready for prime time?

20. Yes it is!

21. Our take aways • Future of iOS will be Swift • New code written in Swift • Rewriting only were it makes sense (lot of code changes, restructuring) • Know Swift AND Objective-C • Swift uses different patterns • Hard to follow good patterns when interfacing with Objective-C

22. Experience

23. Experience • Compiler bugs: crashes instead of error • Renew Certiﬁcate, otherwise it crashes submitted build • At ﬁrst slower when writing code, but learning fast • Choice between Objective-C vs Swift patterns • Cocoapods support is still beta • cocoapods --pre installs 1.0.36(beta)

24. pod 'Alamofire', :git => 'https://github.com/Alamofire/ Alamofire.git', :branch => ‘xcode-6.3' pod 'SwiftyJSON', :git => 'https://github.com/ SwiftyJSON/SwiftyJSON.git', :branch => 'xcode6.3'

25. Favourite Swift Way enum Router: URLStringConvertible { static let baseURLString = "http://example.com" case Root case User(String) case Post(Int, Int, String) // MARK: URLStringConvertible var URLString: String { let path: String = { switch self { case .Root: return "/" case .User(let username): return "/users/(username)" case .Post(let year, let month, let title): let slug = title.stringByReplacingOccurrencesOfString(" ", withString: "-").lowercaseString return "/(year)/(month)/(slug)" } }() return Router.baseURLString + path } } Enum with associated value and computed property

26. Learn Swift • Read “The Swift Programming Language” by Apple • thatthinginswift.com • swiftdoc.org • learnswift.tips • Start coding in Swift! • github.com/raywenderlich/swift-style-guide

27. My experience learning Swift • Functional Programming is different • Force yourself to using good practices. Make use of strict types. Which is hard. • Harder to deﬁne public interface (no header). Standard access modiﬁer is internal. Also makes testing harder.

28. Single most hardest thing in Swift?

29. ;

31. @wolfgang_damm Wolfgang Damm CTO & Co-Founder [email protected] www.pocket-lifestyle.com

Swift should I switch?

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