Donny Wals 👾
@donnywals.bsky.social
iOS Engineer, blogger and author at https://donnywals.com. Loves learning and sharing knowledge. -- #swift #ios #swiftlang #iosdev #solopreneur (he/him)
What are you thoughts on iterating Observable properties with the Observations object in Swift? I feel like it's easier to grok than withObservationTracking but the syntax is a bit verbose... how do you think Obs...
https://www.donnywals.com/using-observations-to-observe-observable-model-properties/
https://www.donnywals.com/using-observations-to-observe-observable-model-properties/
November 10, 2025 at 2:51 PM
What are you thoughts on iterating Observable properties with the Observations object in Swift? I feel like it's easier to grok than withObservationTracking but the syntax is a bit verbose... how do you think Obs...
https://www.donnywals.com/using-observations-to-observe-observable-model-properties/
https://www.donnywals.com/using-observations-to-observe-observable-model-properties/
Did you know that the ability to iterate arrays, sets, and dictionaries in Swift are a result of Swift's protocol oriented design?
Learn more in this week's post: https://www.donnywals.com/a-deep-dive-into-collections-sequences-and-iterators-in-swift/
Learn more in this week's post: https://www.donnywals.com/a-deep-dive-into-collections-sequences-and-iterators-in-swift/
November 6, 2025 at 11:12 AM
Did you know that the ability to iterate arrays, sets, and dictionaries in Swift are a result of Swift's protocol oriented design?
Learn more in this week's post: https://www.donnywals.com/a-deep-dive-into-collections-sequences-and-iterators-in-swift/
Learn more in this week's post: https://www.donnywals.com/a-deep-dive-into-collections-sequences-and-iterators-in-swift/
Can you spot the issue with this code? There's a memory leak that I've seen introduced in many codebases.
In this week's post I explain exactly what the leak is, and how you can avoid memory leaks in tasks
https://www.donnywals.com/comparing-lifecycle-management-for-async-sequences-and-publishers/
In this week's post I explain exactly what the leak is, and how you can avoid memory leaks in tasks
https://www.donnywals.com/comparing-lifecycle-management-for-async-sequences-and-publishers/
September 18, 2025 at 5:01 PM
Can you spot the issue with this code? There's a memory leak that I've seen introduced in many codebases.
In this week's post I explain exactly what the leak is, and how you can avoid memory leaks in tasks
https://www.donnywals.com/comparing-lifecycle-management-for-async-sequences-and-publishers/
In this week's post I explain exactly what the leak is, and how you can avoid memory leaks in tasks
https://www.donnywals.com/comparing-lifecycle-management-for-async-sequences-and-publishers/
Learn how to build this cool custom UI Component for iOS 26 using Liquid Glass 😱
www.donnywals.com/designing-cu...
www.donnywals.com/designing-cu...
July 1, 2025 at 6:53 PM
Learn how to build this cool custom UI Component for iOS 26 using Liquid Glass 😱
www.donnywals.com/designing-cu...
www.donnywals.com/designing-cu...
Today is your last chance to get 25% off on my books using code WWDC25! Don't miss out 😱
https://donnywals.gumroad.com
https://donnywals.gumroad.com
June 15, 2025 at 9:20 AM
Today is your last chance to get 25% off on my books using code WWDC25! Don't miss out 😱
https://donnywals.gumroad.com
https://donnywals.gumroad.com
Today is a good day for Practical Swift Concurrency 😁
June 13, 2025 at 5:44 PM
Today is a good day for Practical Swift Concurrency 😁
Practical Swift Concurrency will be updated for Swift 6.2, and will cover the changes to default actor isolation and inheritance in-depth. Buy now with 25% off and get the updated version for free 😁
https://gumroad.com/l/practical-swift-concurrency/wwdc25
https://gumroad.com/l/practical-swift-concurrency/wwdc25
June 13, 2025 at 1:47 PM
Practical Swift Concurrency will be updated for Swift 6.2, and will cover the changes to default actor isolation and inheritance in-depth. Buy now with 25% off and get the updated version for free 😁
https://gumroad.com/l/practical-swift-concurrency/wwdc25
https://gumroad.com/l/practical-swift-concurrency/wwdc25
Happy last day of WWDC! Here's your reminder that you can still get 25% off on my books for a couple more days. Yes, they will be updated where needed for free, and yes the concurrency book will be updated for Swift 6.2 😁
https://donnywals.gumroad.com
https://donnywals.gumroad.com
June 13, 2025 at 8:48 AM
Happy last day of WWDC! Here's your reminder that you can still get 25% off on my books for a couple more days. Yes, they will be updated where needed for free, and yes the concurrency book will be updated for Swift 6.2 😁
https://donnywals.gumroad.com
https://donnywals.gumroad.com
Felt like I didn't really do much today but turns out it was actually a rather productive day with lots of different small tasks done. 😅
Context switching makes things messy
Context switching makes things messy
June 11, 2025 at 4:01 PM
Felt like I didn't really do much today but turns out it was actually a rather productive day with lots of different small tasks done. 😅
Context switching makes things messy
Context switching makes things messy
Happy WWDC 2025 week! To celebrate I'm hosting a sale for all my books.
Get 25% off:
https://gumroad.com/l/practical-combine/wwdc25
https://gumroad.com/l/practical-core-data/wwdc25
https://gumroad.com/l/practical-swift-concurrency/wwdc25
https://gumroad.com/l/practical-bundle/wwdc25
Get 25% off:
https://gumroad.com/l/practical-combine/wwdc25
https://gumroad.com/l/practical-core-data/wwdc25
https://gumroad.com/l/practical-swift-concurrency/wwdc25
https://gumroad.com/l/practical-bundle/wwdc25
June 9, 2025 at 1:29 PM
Happy WWDC 2025 week! To celebrate I'm hosting a sale for all my books.
Get 25% off:
https://gumroad.com/l/practical-combine/wwdc25
https://gumroad.com/l/practical-core-data/wwdc25
https://gumroad.com/l/practical-swift-concurrency/wwdc25
https://gumroad.com/l/practical-bundle/wwdc25
Get 25% off:
https://gumroad.com/l/practical-combine/wwdc25
https://gumroad.com/l/practical-core-data/wwdc25
https://gumroad.com/l/practical-swift-concurrency/wwdc25
https://gumroad.com/l/practical-bundle/wwdc25
One of these buttons takes about 150ms to perform its work. The other takes more than 5 seconds.
Which one do you expect to be the fast one?
Which one do you expect to be the fast one?
June 5, 2025 at 8:22 AM
One of these buttons takes about 150ms to perform its work. The other takes more than 5 seconds.
Which one do you expect to be the fast one?
Which one do you expect to be the fast one?
WWDC is always a good time for me to reflect on my books, and which updates they might need. I started reviewing my books to see which should be updated regardless of WWDC.
Learn about my current plans, and my WWDC25 sale now: https://donnywals.gumroad.com/p/book-updates-and-wwdc-2025
Learn about my current plans, and my WWDC25 sale now: https://donnywals.gumroad.com/p/book-updates-and-wwdc-2025
June 3, 2025 at 10:04 AM
WWDC is always a good time for me to reflect on my books, and which updates they might need. I started reviewing my books to see which should be updated regardless of WWDC.
Learn about my current plans, and my WWDC25 sale now: https://donnywals.gumroad.com/p/book-updates-and-wwdc-2025
Learn about my current plans, and my WWDC25 sale now: https://donnywals.gumroad.com/p/book-updates-and-wwdc-2025
💰 WWDC 2025 is right around the corner so it's time for a big sale!
Get 25% off all my books and courses with discount code WWDC25 until June 15th!
https://donnywals.gumroad.com/
Get 25% off all my books and courses with discount code WWDC25 until June 15th!
https://donnywals.gumroad.com/
June 3, 2025 at 5:44 AM
💰 WWDC 2025 is right around the corner so it's time for a big sale!
Get 25% off all my books and courses with discount code WWDC25 until June 15th!
https://donnywals.gumroad.com/
Get 25% off all my books and courses with discount code WWDC25 until June 15th!
https://donnywals.gumroad.com/
So apparently, Wednesday has been my most productive day on average last month. Didn't expect that tbh.
I want to add more insights later but this is already pretty cool 😁
Want graphs like this too? Check out Chrona for Mac: https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
I want to add more insights later but this is already pretty cool 😁
Want graphs like this too? Check out Chrona for Mac: https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
May 19, 2025 at 8:00 AM
So apparently, Wednesday has been my most productive day on average last month. Didn't expect that tbh.
I want to add more insights later but this is already pretty cool 😁
Want graphs like this too? Check out Chrona for Mac: https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
I want to add more insights later but this is already pretty cool 😁
Want graphs like this too? Check out Chrona for Mac: https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
I'm about to submit a small update for Chrona that provides some useful insights for your tracked pomodoros. Ever wondered which days / times of day were your best productivity-wise?
Chrona can help you figure that out 😁
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
Chrona can help you figure that out 😁
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
May 16, 2025 at 2:51 PM
I'm about to submit a small update for Chrona that provides some useful insights for your tracked pomodoros. Ever wondered which days / times of day were your best productivity-wise?
Chrona can help you figure that out 😁
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
Chrona can help you figure that out 😁
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
Let's go ahead and make today a productive day. 6 timers with a 5 star ranking? Should be doable right? 💪
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
May 2, 2025 at 7:26 AM
Let's go ahead and make today a productive day. 6 timers with a 5 star ranking? Should be doable right? 💪
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
Time to get working and log some pomodoros! Goal for today is to have at least 6 5-star pomodoros tracked 💪
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
April 28, 2025 at 7:07 AM
Time to get working and log some pomodoros! Goal for today is to have at least 6 5-star pomodoros tracked 💪
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
https://apps.apple.com/us/app/chrona-enhanced-pomodoros/id6744358744
Great way to start the day! Ps. Check out the sneak preview of Maxine’s new design 🤩
I just completed a 00:37:26 workout and burned 290 kcal (360 total).
Workout tracked with Maxine: https://apps.apple.com/us/app/maxine-one-rep-max-tracker/id6615073254
I just completed a 00:37:26 workout and burned 290 kcal (360 total).
Workout tracked with Maxine: https://apps.apple.com/us/app/maxine-one-rep-max-tracker/id6615073254
April 24, 2025 at 7:22 AM
Great way to start the day! Ps. Check out the sneak preview of Maxine’s new design 🤩
I just completed a 00:37:26 workout and burned 290 kcal (360 total).
Workout tracked with Maxine: https://apps.apple.com/us/app/maxine-one-rep-max-tracker/id6615073254
I just completed a 00:37:26 workout and burned 290 kcal (360 total).
Workout tracked with Maxine: https://apps.apple.com/us/app/maxine-one-rep-max-tracker/id6615073254
Expect some higher volume in posting today! 😄
April 9, 2025 at 4:55 AM
Expect some higher volume in posting today! 😄
And now we hope that the review is swift and smooth! 🤞
Pretty cool to have my first of (at least) 4 apps submitted to the Mac App Store 😁. Especially because this is my very first Mac app
Pretty cool to have my first of (at least) 4 apps submitted to the Mac App Store 😁. Especially because this is my very first Mac app
April 8, 2025 at 11:57 AM
And now we hope that the review is swift and smooth! 🤞
Pretty cool to have my first of (at least) 4 apps submitted to the Mac App Store 😁. Especially because this is my very first Mac app
Pretty cool to have my first of (at least) 4 apps submitted to the Mac App Store 😁. Especially because this is my very first Mac app
I think it's about time I ship my first app of the year this week...
Track pomodoros, write down what you did, and review your productivity in graphs. It's a simple idea, but it's been working _really_ well for me these past few weeks. 😁
Just a few more small things to fix before I'm ready
Track pomodoros, write down what you did, and review your productivity in graphs. It's a simple idea, but it's been working _really_ well for me these past few weeks. 😁
Just a few more small things to fix before I'm ready
April 7, 2025 at 6:32 PM
I think it's about time I ship my first app of the year this week...
Track pomodoros, write down what you did, and review your productivity in graphs. It's a simple idea, but it's been working _really_ well for me these past few weeks. 😁
Just a few more small things to fix before I'm ready
Track pomodoros, write down what you did, and review your productivity in graphs. It's a simple idea, but it's been working _really_ well for me these past few weeks. 😁
Just a few more small things to fix before I'm ready
There's absolutely no way that I'm going to stick to my goal of launching my first quarterly project today, but I'm very happy with where it's at right now and I do want to get it archived and up on Gumroad soon. Just a couple of UI tweaks and bug fixes and it's what I'd call my MVP.
March 31, 2025 at 12:32 PM
There's absolutely no way that I'm going to stick to my goal of launching my first quarterly project today, but I'm very happy with where it's at right now and I do want to get it archived and up on Gumroad soon. Just a couple of UI tweaks and bug fixes and it's what I'd call my MVP.
💪💪
I just completed a 00:39:51 workout and burned 297 kcal (374 total).
Workout tracked with Maxine: https://apps.apple.com/us/app/maxine-one-rep-max-tracker/id6615073254
I just completed a 00:39:51 workout and burned 297 kcal (374 total).
Workout tracked with Maxine: https://apps.apple.com/us/app/maxine-one-rep-max-tracker/id6615073254
March 20, 2025 at 8:07 AM
💪💪
I just completed a 00:39:51 workout and burned 297 kcal (374 total).
Workout tracked with Maxine: https://apps.apple.com/us/app/maxine-one-rep-max-tracker/id6615073254
I just completed a 00:39:51 workout and burned 297 kcal (374 total).
Workout tracked with Maxine: https://apps.apple.com/us/app/maxine-one-rep-max-tracker/id6615073254
Join me today for a deep dive into some of swift concurrency’s most complex topics 😎
www.eventbrite.nl/e/digging-in...
www.eventbrite.nl/e/digging-in...
March 13, 2025 at 8:21 AM
Join me today for a deep dive into some of swift concurrency’s most complex topics 😎
www.eventbrite.nl/e/digging-in...
www.eventbrite.nl/e/digging-in...