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

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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...

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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...

New article: IO is special. blog.ploeh.dk/2025/09/08/i...

#repostfriday Name by role. blog.ploeh.dk/2020/11/30/n...

That's the first time I've seen someone named Haskell who isn't Haskell Curry, I think.

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New article: Song recommendations with C# free monads. blog.ploeh.dk/2025/09/01/s...

#repostfriday AFK. blog.ploeh.dk/2020/05/11/afk

New article: Song recommendations with F# free monads. blog.ploeh.dk/2025/08/25/s...

#repostfriday Algebraic data types aren't numbers on steroids. blog.ploeh.dk/2020/01/20/a...

New article: Song recommendations with Haskell free monads. blog.ploeh.dk/2025/08/18/s...

At IT Days 2023 in Cluj-Napoca I gave a keynote that remains topical today, so I'm happy that it's finally online: Epistemology of software. How do we know that software works? If written by LLMs? If written by people? youtu.be/bLpwNWWs5EY?...

New article: Song recommendations with free monads. blog.ploeh.dk/2025/08/11/s...

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

New article: Testing races with a synchronizing Decorator. blog.ploeh.dk/2025/08/04/t...

#repostfriday Subjectivity. blog.ploeh.dk/2020/10/12/s...

New article: Song recommendations with F# agents. blog.ploeh.dk/2025/07/28/s...

#repostfriday We need young programmers; we need old programmers. blog.ploeh.dk/2020/09/14/w...

Only one seat left for Alchemist, the world's fifth-best restaurant, with me. Hurry while supply lasts! blog.ploeh.dk/alchemist

New article: Song recommendations with C# Reactive Extensions. blog.ploeh.dk/2025/07/21/s...

#repostfriday Where's the science? blog.ploeh.dk/2020/05/25/w...