Some thoughts about the (far?) future use of AGI for programming. My 2024 IT Days keynote "There's no Voight-Kampff test": youtu.be/X_SsnmZ4Dlc?...

New article: AI-generated tests as ceremony. blog.ploeh.dk/2026/01/26/a...

#repostfriday When is an implementation detail an implementation detail? blog.ploeh.dk/2023/06/19/w...

New article: Filtering as domain logic. blog.ploeh.dk/2026/01/19/f...

I still get a chuckle out of this example. #repostfriday AI for doc comments. blog.ploeh.dk/2023/07/10/a...

New article: Two regimes of Git. blog.ploeh.dk/2026/01/12/t...

#repostfriday Favour flat code file folders. blog.ploeh.dk/2023/05/29/f...

Happy new year. Over two incarnations, ploeh blog is now 20 years old and sports 946 articles. A few kind souls find it useful enough to sponsor it. You can join them: blog.ploeh.dk/support

On this date, twenty years ago, I published my first blog post on the now-defunct MSDN blog. Still, it counts as an anniversary of sorts, I think. learn.microsoft.com/en-us/archiv...

New article: Coupling from a big-O perspective. blog.ploeh.dk/2026/01/05/c...

New article: Git integration is ten years away. blog.ploeh.dk/2025/12/29/g...

#repostfriday Fit URLs. blog.ploeh.dk/2020/10/26/f...

New article: Test-specific Eq. blog.ploeh.dk/2025/12/22/t...

"System.ArgumentException: Parameter is not valid." Gee, thanks. Which parameter? What was the value? What constitutes a valid value? Please write better exception messages. blog.ploeh.dk/2014/12/23/e...

#repostfriday Confidence from Facade Tests. blog.ploeh.dk/2023/03/13/c...

New article: Tautological assertions are not always caused by aliasing. blog.ploeh.dk/2025/12/15/t...

#repostfriday In the long run. blog.ploeh.dk/2023/01/16/i...

TIL that it's possible to yield from within #fsharp lists: > [yield 1; yield! [2;3]; yield 4];; val it: int list = [1; 2; 3; 4]

New article: Pattern guards for a protocol. blog.ploeh.dk/2025/12/08/p...

#repostfriday Decouple to delete. blog.ploeh.dk/2022/11/21/d...

Other readers are showing their appreciation of ploeh blog by supporting it. You, too, can do that. blog.ploeh.dk/support

New article: Treat test code like production code. blog.ploeh.dk/2025/12/01/t...

#repostfriday TDD improves reusability. blog.ploeh.dk/2011/11/10/T...

New article: Result is the most boring sum type. blog.ploeh.dk/2025/11/24/r...

#repostfriday Modelling versus shaping reality. blog.ploeh.dk/2020/05/18/m...

New article: Empirical software prototyping. blog.ploeh.dk/2025/11/17/e...

New article: 100% coverage is not that trivial. blog.ploeh.dk/2025/11/10/1...

'Paratechnical power user'. Nice phrase coinage. Well done, 2023-me! #repostfriday blog.ploeh.dk/2023/10/23/d...

Other readers are showing their appreciation of ploeh blog by supporting it. You, too, can do that. blog.ploeh.dk/support

New article: Empirical Characterization Testing. blog.ploeh.dk/2025/11/03/e...

I'm almost afraid to jinx it, but I've been writing non-trivial Haskell in @vscode.dev all week, and been impressed with how stable and useful it's become of late 👍👌 marketplace.visualstudio.com/items?itemNa...

#repostfriday When to refactor: blog.ploeh.dk/2022/09/19/w...

TIL how to FOCUS the Visual Studio Code hover window. I've long known that Ctrl+k,Ctrl+i shows hover information (e.g. type, documentation), but this hover window sometimes contains so much text that you have to scroll it. How to do that without the mouse? Press Ctrl+k,Ctrl+i again!

New article: Empirical test-after development. blog.ploeh.dk/2025/10/27/e...

Two years ago I wondered if software was getting worse. These days, however, it just seems as though updates are becoming increasingly irrelevant. I really don't care that I can add artificial bunnies to pictures 🙄 #repostfriday blog.ploeh.dk/2023/07/24/i...

New article: Epistemology of software. blog.ploeh.dk/2025/10/20/e...

New article: Result isomorphism. blog.ploeh.dk/2025/10/15/r...

#repostfriday Changing your organisation. blog.ploeh.dk/2021/12/20/c...

Other readers are showing their appreciation of ploeh blog by supporting it. You, too, can do that. blog.ploeh.dk/support

New article: Shift left on x. blog.ploeh.dk/2025/10/06/s...

#repostfriday Unit testing private helper methods. blog.ploeh.dk/2021/09/13/u...

I've been reviewing some Python code that uses Result return types (via returns.readthedocs.io), and once more I refer to @eiriktsarpalis.bsky.social's excellent article 'You’re better off using Exceptions': eiriktsarpalis.wordpress.com/2017/02/19/y...

As things currently look, IT Days in Cluj-Napoca is going to be my only public appearance in 2025. www.itdays.ro

New article: Composing pure Haskell assertions. blog.ploeh.dk/2025/09/29/c...

#repostfriday Property-based testing is not the same as partition testing. blog.ploeh.dk/2021/06/28/p...

It's striking so quickly the industry forgets that lines of code isn't a measure of productivity. blog.ploeh.dk/2025/09/22/i...

While you wait for your work language to get discriminated unions: Your language already has discriminated unions. #repostfriday Visitor as a sum type. blog.ploeh.dk/2018/06/25/v...

Look, I found a real-life Tron Recognizer ship!

New article: Greyscale-box test-driven development. blog.ploeh.dk/2025/09/15/g...

#repostfriday Against consistency. blog.ploeh.dk/2021/05/17/a...