iiinova — where your digital self keeps evolving

Alex Ozun @alexozun.com · 25/09/2026

I had a privilege of writing this week's issue of iOS Dev Weekly. It's now live and should be making its way into your inboxes. I hope you enjoy it! iosdevweekly.com/issues/769/

iosdevweekly.com

Issue 769 – iOS Dev Weekly

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Alex Ozun @alexozun.com · 10/09/2026

I have to say, using an electric guitar whammy bar as an example of the iPhone Duo hinge API was bloody genius! youtu.be/Biqw19XiqQY?...

youtu.be

Leverage multiple displays and scenes on iPhone Duo | Apple

YouTube video by Apple Developer

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Alex Ozun @alexozun.com · 28/08/2026

This week's issue of iOS Dev Weekly is now live and making its way into your inboxes. Happy Friday! iosdevweekly.com/issues/765/

iosdevweekly.com

Issue 765 – iOS Dev Weekly

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Alex Ozun @alexozun.com · 15/08/2026

Just registered a domain nomeatproxy.net that redirects to the original article "Don't be a meat proxy" by Niklas Gruhn - which gives name to the new pervasive behaviour that plagues workspaces. I wanted a short domain that I could put it on my Slack status, where I'd previously have nohello.net

nomeatproxy.net

Don't be a meat proxy

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Alex Ozun @alexozun.com · 03/08/2026

As some of you may have noticed, I've joined the editorial team of the legendary iOS Dev Weekly newsletter. It's a huge responsibility and an opportunity to contribute to the Apple developer community, one I don't take for granted.

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Alex Ozun @alexozun.com · 28/07/2026

Why does this sound like a threat? 😅 #WWDC26

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Scott Smith @scottsmithdev.bsky.social · 27/05/2026

A major part of my CLAUDE md file is always all of @alexozun.com’s teachings on Type-Driven Design in Swift. It remains, to this day, the most powerful Swift content I’ve ever read. Your agents will output MUCH better code with it. swiftology.io/collections/...

swiftology.io

Type-Driven Design with Swift | Swiftology

Learn how to use Swift's flexible type system to design high-quality, robust, and correct programs.

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Alex Ozun @alexozun.com · 16/02/2026

Make the AI agent’s job easy (warning: this may be hard), then give it an easy job.

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Alex Ozun @alexozun.com · 08/02/2026

I initially planned this as a short post on socials, but it quickly evolved into a blog. Here’s my recommended reading list to get you from Zero to Hero in Swift Concurrency. It’s based on my own learning journey, with adjustments that work better for 2026. swiftology.io/articles/swi... #swiftlang

swiftology.io

Swift Concurrency from Zero to Hero | Reading List | Swiftology

In this short post I want to recommend an ordered reading list that will get you from Zero to Hero in Swift Concurrency

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Alex Ozun @alexozun.com · 30/01/2026

Today at #fosdem #swiftlang in Brussels. Greeted with a perfect swag for a nippy winter day.

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Alex Ozun @alexozun.com · 05/01/2026

Swift Effect is now in public preview! it is an architecture-agnostic effect system that makes side effects (such as I/O, networking, randomness, concurrency) controllable, composable, and testable without forcing structural changes to your application code. github.com/Alex-Ozun/sw... #swiftlang

github.com

GitHub - Alex-Ozun/swift-effect: Algebraic Effects and Effect Handlers for Swift

Algebraic Effects and Effect Handlers for Swift. Contribute to Alex-Ozun/swift-effect development by creating an account on GitHub.

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Alex Ozun @alexozun.com · 18/12/2025

Dijkstra predicted in 1978 how people would feel about #Swift Strict Concurrency checking in 2025.

Text in the image: some people found error messages they couldn't ignore more annoying than wrong results, and, when judging the relative merits of programming languages, some still seem to equate "the ease of programming" with the ease of making undetected mistakes.

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Alex Ozun @alexozun.com · 11/11/2025

Hey friend, I've got a new article on Swift Testing for you! 📝 I share my insights on avoiding common pitfalls of Parameterized Tests, gained from overseeing the migration of tens of thousands of tests from XCTest to Swift Testing. swiftology.io/articles/pit... #swiftlang #swift

swiftology.io

Pitfalls of Parameterized Tests | Swiftology

In this article, I share my experience adopting Swift Testing at scale and the lessons I learned about **Parameterized Tests**, including five common pitfalls teams may encounter. I also recommend bes...

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Alex Ozun @alexozun.com · 22/10/2025

Hey look what just dropped! A recording of my recent talk from iOSKonf25! The recording didn't capture the stage camera's feed, but that's totally fine because I have a radio face anyway 🫥 youtu.be/AnUS_zmSnVg #swiftlang #swiftui #ios

youtu.be

Make Invalid States Impossible in Your App | iOSKonf25 | Alex Ozun

YouTube video by iOSKonf

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Matt Massicotte @massicotte.org · 13/06/2025

Finally got around to watching @alexozun.com‘s talk here. Truly fascinating stuff, and I learned something about non-Copyable types too! youtu.be/qPHjDlqHsUQ?...

youtu.be

Typestate - the new Design Pattern in Swift 5.9 | Swift Heroes 2024 Talk

YouTube video by Swift Heroes

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Alex Ozun @alexozun.com · 09/06/2025

RIP Google's #Flutter team who will have to replicate the Liquid Glass look and feel for their Cupertino widgets. #wwdc

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Oliver Binns @oliverbinns.co.uk · 20/05/2025

This is the second time I’ve seen @alexozun.com’s talk on making invalid state impossible and it’s a really cool approach to improved software safety!

Alex presenting a slide with a QR code on labeled “let’s connect!”

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Alex Ozun @alexozun.com · 20/05/2025

Doug Gregor takes the stage of @swiftcraft.bsky.social with a keynote talk On Progressive Disclosure in #swiftlang

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Alex Ozun @alexozun.com · 16/05/2025

I had a blast presenting at #iOSKonf25 this week! I heard great things about this conference and I now can say that the praise was well-deserved! It was pretty scary to be on the lineup with so many accomplished engineers and speakers, but the vibe was really good and everyone was easy to be around.

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Reposted by Alex Ozun

Daniel Saidi @danielsaidi.bsky.social · 14/05/2025

Next up: @alexozun.com on how to make invalid states impossible in your app.

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Alex Ozun @alexozun.com · 10/04/2025

The secret to introducing people to scary-sounding concepts like Free Monads in #swiftlang is in never mentioning these two words until the very end of the presentation.

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Alex Ozun @alexozun.com · 08/04/2025

Tiers of Swift development sins by Pietro Messineo at @swiftheroes.bsky.social

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Alex Ozun @alexozun.com · 27/03/2025

Good software design is about adding the necessary amount of indirection without compromising performance too much. Good performance optimization is about removing unnecessary indirection without compromising software design too much.

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Alex Ozun @alexozun.com · 26/03/2025

Now, that it's official, I'm sharing my 2025 #swiftlang conference schedule, so far: 1. Swift Heroes (April 8-9): Controlling Side Effects with Swift. 2. iOSKonf (May 13-15): Make invalid state impossible in your apps. 3. Swift Craft (May 20-21): Swift Abstractions Demystified.

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Alex Ozun @alexozun.com · 13/03/2025

Feedback like this is what keeps me going (even at my snail's pace 😅)

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Alex Ozun @alexozun.com · 17/02/2025

My 2025 #swiftlang conference schedule is shaping up 🗓️ This year, I'm bringing not one, not two, but *three* brand new talks to the community! So far, these are confirmed: 1. Controlling side effects with Swift 2. Make invalid states impossible in your app 3. Swift abstractions demystified

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Alex Ozun @alexozun.com · 12/02/2025

Caffeinated and ready to learn how to build fast and efficient apps from #Apple engineers at the new Dev Center in Battersea Power Plant.

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Alex Ozun @alexozun.com · 02/02/2025

I've been putting off reading #brandonsanderson books for a few years, but finally got to them. Now that I've finished the Mistborn trilogy and started the Stormlight Archive, he's quickly becoming my favourite modern fantasy author - on par with Sapkowski (while having a more pleasant personality).

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Alex Ozun @alexozun.com · 29/01/2025

It's great to see #Apple bringing these in-person sessions to local dev centers around the world. I look forward to hearing about "Building faster and more efficient apps" in two weeks.

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Alex Ozun @alexozun.com · 28/01/2025

My talk from Swift Heroes 2024 has just been published. If you're interested in Noncopyable types, type-level programming, and State Machines, check it out. I had a lot of fun researching Typestate programming in #swiftlang, and I'm happy with how this talk turned out. youtu.be/qPHjDlqHsUQ

youtu.be

Typestate - the new Design Pattern in Swift 5.9 | Swift Heroes 2024 Talk

YouTube video by Swift Heroes

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Alex Ozun @alexozun.com · 25/01/2025

I'm a weird type of an application developer because when it comes to customer support I absolutely hate any sort of automation or self-service like chat bots or phone robots. If I'm performing a BAU operation, like changing a PIN number, I just want a button that's directly hooked up to API.

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Alex Ozun @alexozun.com · 21/01/2025

It was nice visiting #apple developer center in Singapore the other day

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Alex Ozun @alexozun.com · 16/01/2025

Yes, they really flew me all the way from London to Singapore just so I could show a photo of an elephant to #iosconfsg audience.

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Alex Ozun @alexozun.com · 13/01/2025

Heading out to my first conference of the year at #iOSConfSG If you happen to be around, drop me a message and let's have a coffee ☕️ P.S. I prefer to travel light and only pack essentials.

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Alex Ozun @alexozun.com · 22/12/2024

Holy smokes🤯! I think I was just able to create a proof-of-concept of #swiftlang effect system that allows to write direct style imperative code and then test it WITHOUT mocks by stepping through each suspension point and directly feeding input arguments to effects (e.g. readline).

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Alex Ozun @alexozun.com · 22/12/2024

I'm having a "do I even know Swift?" moment. I understand that #swiftlang generics are invariant, i.e. F<Dog> is not a subtype of F<Animal>, even though Dog is a subtype of Animal. But some stdlib generic types like Optional and Array do track subtyping (see pic), while others, like Result, don't.

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Alex Ozun @alexozun.com · 19/12/2024

I like this Onboarding UX from Mozi where each step reveals a new tab on the tab bar #ios #ux

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Alex Ozun @alexozun.com · 18/12/2024

A/B testing is one of the most overused and misused engineering techniques ever. And what's worse, the majority of dev teams are pretty oblivious to the immense complexity even the simplest A/B test brings to their mobile systems. It's crazy how we got here. youtu.be/cTbTZ-uShr8 #ios #swiftlang

youtu.be

Hidden engineering challenges of A/B Testing - Anastasia Petrova | SwiftLeeds 2024

YouTube video by SwiftLeeds

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Alex Ozun @alexozun.com · 13/12/2024

A procrastinating conference speaker's equivalent of an indie dev "spending an entire day designing the app icon before writing a single line of code" is "spending an entire day designing the title slide before adding any content." And I'll redo the title slide 15 mins before the talk anyhow. Twice

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Alex Ozun @alexozun.com · 11/12/2024

With #swiftlang It's easy to forget that the diff between a point-free and pointed styles of function argument passing is not just syntactic but semantic. It's normal to consider these to be equivalent: 1. [1, 2].map(String.init) 2. [1, 2].map { String($0) } But we shouldn't forget that: 1/4

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Alex Ozun @alexozun.com · 07/12/2024

Loving this "unlock, generously" paywall option 😁

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Alex Ozun @alexozun.com · 07/12/2024

Honestly, craftinginterpreters.com is the funniest technical book I read in a while. @munificent.bsky.social writing style is 😙🤌

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Alex Ozun @alexozun.com · 06/12/2024

A problematic little #swiftlang pattern I often see is "unwrap-then-nullify" for optional values that hold some temp state. This oft comes up when dealing with local caches or scrollOffsets or in-flight tasks, etc. Forgetting to nullify a value to "reset" state is a common mistake. Use take method.

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Alex Ozun @alexozun.com · 05/12/2024

This might be my favorite new warning in #Xcode 16! I totally missed SE-0364, so it was a pleasant surprise to see that #swiftlang compiler nows warn about potentially conflicting protocol conformances. This is super helpful for any highly-modularized project (aka freaking all of them these days!).

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Alex Ozun @alexozun.com · 03/12/2024

It's my annual learning week at Amex, and I'm building a small programming language using #swiftlang, following a fantastic book craftinginterpreters.com by @munificent.bsky.social Super pumped about this challenge, I already know I'm gonna have a great time!

craftinginterpreters.com

Crafting Interpreters

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Alex Ozun @alexozun.com · 01/12/2024

Semi-accidentally found Slava Pestov's book "Compiling Swift Generics". It looks demanding, but def not as dense as a typical compilers textbook. And being based on #swiftlang, the lang I more/less know, gives me some hope. This might be my next big reading project download.swift.org/docs/assets/...

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Alex Ozun @alexozun.com · 28/11/2024

Last week, our #iOS engineering team at #amex in London had the privilege of hosting a #SwiftUI Workshop by the highly regarded objc.io team, @chriseidhof.bsky.social and Florian Kugler.

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Alex Ozun @alexozun.com · 25/11/2024

Good read! Though, some points went over my head since I haven't had a chance to dig deep into Swift 6. I'll take another pass, but here are my immediate thoughts:

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Alex Ozun @alexozun.com · 25/11/2024

Blue sky is literally on our flag! 🇺🇦 Ukrainian #swiftlang programmers, join this starter pack to quickly connect.

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Alex Ozun @alexozun.com · 24/11/2024

Dunno how this information evaded me this long, but I learned from @chriseidhof.bsky.social the other day that you can interact with backgrounded apps without bringing them to foreground by CMD-clicking. My life will never be the same. #macOS #mac

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