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https://henrikwarne.com/2023/01/07/there-is-no-software-maintenance/ There Is No Software Maintenance | Henrik Warne's blog Every time I hear about software maintenance as a distinct activity, I cringe. That’s because it is based on the outdated notion that first software is... software maintenance henrik warne blog https://henrikwarne.com/tag/learning-2/ learning | Henrik Warne's blog Posts about learning written by Henrik Warne henrik warne learning blog https://henrikwarne.com/2019/12/08/eurostar-testing-conference-prague-2019/ EuroSTAR Testing Conference Prague 2019 | Henrik Warne's blog A few weeks ago I spoke at the EuroSTAR software testing conference in Prague. The conference had one and a half days of tutorials, followed by two and a half... conference prague henrik warne eurostar testing blog https://henrikwarne.com/tag/science/ science | Henrik Warne's blog Posts about science written by Henrik Warne henrik warne science blog https://henrikwarne.com/2017/08/20/developer-testing/ Developer Testing | Henrik Warne's blog I recently found out about the book Developer Testing – Building Quality Into Software by Alexander Tarlinder, and I immediately wanted to read it. Even though... henrik warne developer testing blog https://henrikwarne.com/2019/09/29/when-tdd-is-not-a-good-fit/ When TDD Is Not a Good Fit | Henrik Warne's blog I like to use Test-Driven Development (TDD) when coding. However, in some circumstances, TDD is more of a hinderance than a help. This happens when how to... good fit henrik warne tdd blog https://henrikwarne.com/2019/10/27/classic-computer-science-problems-in-python/ Classic Computer Science Problems in Python | Henrik Warne's blog I really enjoyed Classic Computer Science Problems in Python by David Kopec. It covers many different problems I hadn’t read detailed explanations of before.... computer science henrik warne classic problems python https://henrikwarne.com/2022/12/11/switching-to-go-first-impressions/ Switching to Go – First Impressions | Henrik Warne's blog A few months ago I switched to working in Go. Before that, my main language was Python for many years. The change to Go has been very smooth, without any major... first impressions henrik warne switching go blog https://henrikwarne.com/tag/surprises/ surprises | Henrik Warne's blog Posts about surprises written by Henrik Warne henrik warne surprises blog https://henrikwarne.com/2017/03/12/programmer-career-planning/ Programmer Career Planning | Henrik Warne's blog Here are my thoughts on programmer career planning. You should always stay employable, mostly by changing jobs regularly (every five years or so). When... career planning henrik warne programmer blog https://henrikwarne.com/tag/set-game/ SET game | Henrik Warne's blog Posts about SET game written by Henrik Warne set game henrik warne blog https://henrikwarne.com/2013/03/26/what-do-programmers-want/ What Do Programmers Want? | Henrik Warne's blog I got an e-mail last week from three students at Halmstad University doing a three month project on what programmers want in a job, and how companies can... henrik warne programmers want blog https://henrikwarne.com/2014/12/15/programmer-knowledge/ Programmer Knowledge | Henrik Warne's blog What is the half-life of programmer knowledge? It is quite common with claims that the half-life is something like 5 years. In other words, half of what you... henrik warne programmer knowledge blog https://henrikwarne.com/2012/02/26/mac-os-x-break-programs-review/ Mac OS X Break Programs Review | Henrik Warne's blog Like I wrote in a previous post, the use of a break program was probably the main reason I beat Repetitive Stress Injury (RSI). For many years I used WorkPace,... mac os henrik warne break programs review https://henrikwarne.com/category/testing/ Testing | Henrik Warne's blog Posts about Testing written by Henrik Warne henrik warne testing blog https://henrikwarne.com/2025/06/15/lessons-from-9-more-years-of-tricky-bugs/ Lessons From 9 More Years of Tricky Bugs | Henrik Warne's blog Since 2002, I have been keeping track of all the tricky bugs I have come across. Nine years ago, I wrote a blog post with the lessons learned from the bugs up... henrik warne lessons years tricky bugs https://henrikwarne.com/tag/intellij/ intellij | Henrik Warne's blog Posts about intellij written by Henrik Warne henrik warne intellij blog https://henrikwarne.com/category/debugging/ Debugging | Henrik Warne's blog Posts about Debugging written by Henrik Warne henrik warne debugging blog https://henrikwarne.com/category/work/ Work | Henrik Warne's blog Posts about Work written by Henrik Warne henrik warne work blog https://henrikwarne.com/2012/06/02/why-i-love-coding/ Why I Love Coding | Henrik Warne's blog I love coding. Ever since I bought my first computer (a VIC-20), I’ve been fascinated by computer programming. For many years I never thought of why I enjoyed... henrik warne love coding blog https://henrikwarne.com/ Henrik Warne's blog | Thoughts on programming… Thoughts on programming... henrik warne blog thoughts https://henrikwarne.com/tag/command/ command | Henrik Warne's blog Posts about command written by Henrik Warne henrik warne command blog https://henrikwarne.com/2015/04/16/lessons-learned-in-software-development/ Lessons Learned in Software Development | Henrik Warne's blog Here is my list of heuristics and rules of thumb for software development that I have found useful over the years: Development 1. Start small, then extend.... lessons learned software development henrik warne blog https://henrikwarne.com/2019/06/15/nordic-testing-days-tallinn-2019/ Nordic Testing Days Tallinn 2019 | Henrik Warne's blog At the end of May I attended Nordic Testing Days in Tallinn, Estonia. It was the first time I spoke at a conference outside of Sweden, and I had a great time.... henrik warne nordic testing days tallinn https://henrikwarne.com/tag/job-hunt/ job hunt | Henrik Warne's blog Posts about job hunt written by Henrik Warne job hunt henrik warne blog https://henrikwarne.com/tag/recruiting/ recruiting | Henrik Warne's blog Posts about recruiting written by Henrik Warne henrik warne recruiting blog https://henrikwarne.com/tag/rsi/ RSI | Henrik Warne's blog Posts about RSI written by Henrik Warne henrik warne rsi blog https://henrikwarne.com/2016/03/07/ph-d-or-professional-programmer/ Ph.D. or Professional Programmer? | Henrik Warne's blog When I graduated from university with a degree in Computer Science, I wanted to continue and get a Ph.D. But I also wanted to work as a software developer, so... henrik warne ph professional programmer blog https://henrikwarne.com/2018/08/11/my-favorite-command-line-shortcuts/ My Favorite Command-Line Shortcuts | Henrik Warne's blog I use a shell every day. Almost always, I want to repeat a previous command, or repeat it after a slight modification. A very convenient way is to use arrow-up... command line henrik warne favorite shortcuts blog https://henrikwarne.com/tag/emacs/ emacs | Henrik Warne's blog Posts about emacs written by Henrik Warne henrik warne emacs blog https://henrikwarne.com/tag/statistics/ statistics | Henrik Warne's blog Posts about statistics written by Henrik Warne henrik warne statistics blog https://henrikwarne.com/tag/coding/ coding | Henrik Warne's blog Posts about coding written by Henrik Warne henrik warne coding blog https://henrikwarne.com/2019/05/26/book-review-accelerate/ Book review: Accelerate | Henrik Warne's blog The book Accelerate details the findings of four years of research on how DevOps affects various outcomes, such as software delivery tempo and stability, as... book review henrik warne accelerate blog https://henrikwarne.com/2012/12/31/blog-stats-for-2012-by-wordpress/ Blog stats for 2012 (by WordPress) | Henrik Warne's blog The WordPress.com stats helper monkeys prepared a 2012 annual report for this blog. Here’s an excerpt: About 55,000 tourists visit Liechtenstein every year.... henrik warne blog stats wordpress https://henrikwarne.com/2014/01/21/session-based-logging/ Session-based Logging | Henrik Warne's blog To trouble-shoot software, logging of some kind is essential. But for most systems, it is simply not possible to log everything that happens. Many systems and... henrik warne session based logging blog https://henrikwarne.com/2016/04/28/learning-from-your-bugs/ Learning From Your Bugs | Henrik Warne's blog Bugs are great learning opportunities. So how do we make sure we learn as much as possible from the bugs we fix? A method I have used for more than 13 years... henrik warne learning bugs blog https://henrikwarne.com/tag/interruption/ interruption | Henrik Warne's blog Posts about interruption written by Henrik Warne henrik warne interruption blog https://henrikwarne.com/2013/04/02/programmer-productivity-interruptions-meetings-and-working-remotely/ Programmer Productivity – Interruptions, Meetings and Working Remotely | Henrik Warne's blog In my previous post on what programmers want, I ranked working from home low on the list. Several commenters value working from home higher, and K (not his... working remotely henrik warne programmer productivity interruptions https://henrikwarne.com/tag/meeting/ meeting | Henrik Warne's blog Posts about meeting written by Henrik Warne henrik warne meeting blog https://henrikwarne.com/2014/01/27/a-bug-a-trace-a-test-a-twist/ A Bug, a Trace, a Test, a Twist | Henrik Warne's blog Here is the story of a bug that I caused, found, and fixed recently. It is not particularly hard or tricky, and it didn’t take long to find and fix.... henrik warne bug trace test twist https://henrikwarne.com/tag/knowledge/ knowledge | Henrik Warne's blog Posts about knowledge written by Henrik Warne henrik warne knowledge blog https://henrikwarne.com/2021/12/13/on-code-reviews/ On Code Reviews | Henrik Warne's blog There seems to be an established truth in programming that code reviews find a lot of bugs. An example is chapter 18 (Modern Code Review) in the book Making... code reviews henrik warne blog https://henrikwarne.com/tag/programming-job/ programming job | Henrik Warne's blog Posts about programming job written by Henrik Warne henrik warne programming job blog https://henrikwarne.com/tag/chatgpt/ ChatGPT | Henrik Warne's blog Posts about ChatGPT written by Henrik Warne henrik warne chatgpt blog https://henrikwarne.com/tag/office/ office | Henrik Warne's blog Posts about office written by Henrik Warne henrik warne office blog https://henrikwarne.com/category/learning/ Learning | Henrik Warne's blog Posts about Learning written by Henrik Warne henrik warne learning blog https://henrikwarne.com/tag/idea/ idea | Henrik Warne's blog Posts about idea written by Henrik Warne henrik warne idea blog https://henrikwarne.com/2015/10/20/coursera-course-review-software-security/ Coursera Course Review: Software Security | Henrik Warne's blog I just finished taking the course Software Security from the University of Maryland via Coursera. It was a relatively easy course (at least if you know C) that... course review software security henrik warne coursera blog https://henrikwarne.com/2013/11/09/automatically-include-revision-in-log-statement/ Automatically Include Revision in Log Statement | Henrik Warne's blog When there is a problem with your software, the first thing you usually ask for is a log showing what happened (provided you write debuggable code), and the... henrik warne automatically include revision log https://henrikwarne.com/2016/06/16/18-lessons-from-13-years-of-tricky-bugs/ 18 Lessons From 13 Years of Tricky Bugs | Henrik Warne's blog In Learning From Your Bugs, I wrote about how I have been keeping track of the most interesting bugs I have come across. I recently reviewed all 194 entries... henrik warne lessons years tricky bugs https://henrikwarne.com/tag/devops/ DevOps | Henrik Warne's blog Posts about DevOps written by Henrik Warne henrik warne devops blog https://henrikwarne.com/tag/coursera/ coursera | Henrik Warne's blog Posts about coursera written by Henrik Warne henrik warne coursera blog https://henrikwarne.com/2019/04/03/more-good-programming-quotes-part-3/ More Good Programming Quotes, Part 3 | Henrik Warne's blog I like good programming quotes. Here are some new ones I have found since my last posts. Complexity “Why do people find DNS so difficult? It’s just cache... henrik warne good programming quotes part https://henrikwarne.com/2023/09/10/what-i-have-changed-my-mind-about-in-software-development/ What I Have Changed My Mind About in Software Development | Henrik Warne's blog I really like this quote from Jeff Bezos: “Anybody who doesn’t change their mind a lot is dramatically underestimating the complexity of the world we live in.”... software development henrik warne changed mind blog https://henrikwarne.com/category/programming/ Programming | Henrik Warne's blog Posts about Programming written by Henrik Warne henrik warne programming blog https://henrikwarne.com/tag/java/ java | Henrik Warne's blog Posts about java written by Henrik Warne henrik warne java blog https://henrikwarne.com/tag/job/ job | Henrik Warne's blog Posts about job written by Henrik Warne henrik warne job blog https://henrikwarne.com/about/ About | Henrik Warne's blog Hello, and welcome to my blog. My name is Henrik Warne. I am a software developer in Stockholm, Sweden. I have been programming professionally for more than 30... henrik warne blog https://henrikwarne.com/2017/01/15/book-review-the-effective-engineer/ Book Review: The Effective Engineer | Henrik Warne's blog Last month we finished reading “The Effective Engineer” by Edmond Lau in the book club at work. It is a great book full of practical advice on how to get more... book review henrik warne effective engineer blog https://henrikwarne.com/2021/07/12/book-review-a-philosophy-of-software-design/ Book Review: A Philosophy of Software Design | Henrik Warne's blog I really liked A Philosophy of Software Design by John Ousterhout. It is compact and short, only 170 pages, so it is a quick read, but it contains many good... book review software design henrik warne philosophy blog https://henrikwarne.com/tag/programmer/ programmer | Henrik Warne's blog Posts about programmer written by Henrik Warne henrik warne programmer blog https://henrikwarne.com/2026/01/31/in-praise-of-dry-run/ In Praise of –dry-run | Henrik Warne's blog For the last few months, I have been developing a new reporting application. Early on, I decided to add a –dry-run option to the run command. This turned out... henrik warne praise run blog https://henrikwarne.com/tag/conference/ conference | Henrik Warne's blog Posts about conference written by Henrik Warne henrik warne conference blog https://henrikwarne.com/tag/meta/ meta | Henrik Warne's blog Posts about meta written by Henrik Warne henrik warne meta blog https://henrikwarne.com/2015/12/27/social-engineering-from-kevin-mitnick/ Social Engineering from Kevin Mitnick | Henrik Warne's blog I recently finished reading Ghost in the Wires by Kevin Mitnick. It is the story of Mitnick’s hacking career, from the start in his teens, through becoming the... social engineering henrik warne kevin blog https://henrikwarne.com/tag/developer-testing/ developer testing | Henrik Warne's blog Posts about developer testing written by Henrik Warne henrik warne developer testing blog https://henrikwarne.com/tag/mac-os-x/ Mac OS X | Henrik Warne's blog Posts about Mac OS X written by Henrik Warne mac os henrik warne blog https://henrikwarne.com/2016/04/17/more-good-programming-quotes/ More Good Programming Quotes | Henrik Warne's blog In my previous post, The Wisdom of Programming Quotes, I called out some quotes that look good on the surface, but turn out to promote the wrong ideas about... henrik warne good programming quotes blog https://henrikwarne.com/tag/ide/ ide | Henrik Warne's blog Posts about ide written by Henrik Warne henrik warne ide blog https://henrikwarne.com/2021/04/16/more-good-programming-quotes-part-5/ More Good Programming Quotes, Part 5 | Henrik Warne's blog Here are more good programming quotes I have found since my last post. Programming “It has been said that the great scientific disciplines are examples of... henrik warne good programming quotes part https://henrikwarne.com/2023/04/23/well-maintained-software/ Well-maintained Software | Henrik Warne's blog Two months ago, I was a guest on the Maintainable podcast. The first question the host Robby Russell asks is “What are a few characteristics of well-maintained... well maintained henrik warne software blog https://henrikwarne.com/2017/11/19/benefits-of-continuous-delivery/ Benefits of Continuous Delivery | Henrik Warne's blog During my career as a software developer, I have seen the release frequency increasing steadily. When I started, it would take 12 to 18 months for new features... continuous delivery henrik warne benefits blog https://henrikwarne.com/2020/01/20/more-good-programming-quotes-part-4/ More Good Programming Quotes, Part 4 | Henrik Warne's blog Here are more good programming quotes I have found since my last post. Microservices “Microservices are just dynamic linking over HTTP” via @mononcqc... henrik warne good programming quotes part https://henrikwarne.com/2017/07/10/programming-conference-qcon-new-york-2017/ Programming Conference – QCon New York 2017 | Henrik Warne's blog Last week I attended a software development conference, QCon in New York. Here are my impressions of it, as well as some thoughts on programming conferences in... qcon new york henrik warne programming conference blog https://henrikwarne.com/tag/testing-2/ testing | Henrik Warne's blog Posts about testing written by Henrik Warne henrik warne testing blog https://henrikwarne.com/2013/04/07/set-card-game-variation-complementary-pairs/ SET Card Game Variation – Complementary Pairs | Henrik Warne's blog I recently got an e-mail from Michael Sherman, a teacher in New York. He had developed a variation of the card game Set called Complementary Pairs. This is how... card game henrik warne set variation complementary https://henrikwarne.com/2016/04/11/the-wisdom-of-programming-quotes/ The Wisdom of Programming Quotes | Henrik Warne's blog I love good programming quotes. The best ones say something true about the craft of programming, usually both concisely and humorously. Recently I started... henrik warne wisdom programming quotes blog https://henrikwarne.com/tag/google/ Google | Henrik Warne's blog Posts about Google written by Henrik Warne henrik warne google blog https://henrikwarne.com/2021/06/15/on-comments-in-code/ On Comments in Code | Henrik Warne's blog I used to think that I didn’t need comments if I wrote self-documenting code. However, I have realized that I do write comments, and that I find them really... henrik warne comments code blog https://henrikwarne.com/tag/hiring/ hiring | Henrik Warne's blog Posts about hiring written by Henrik Warne henrik warne hiring blog https://henrikwarne.com/tag/logging/ logging | Henrik Warne's blog Posts about logging written by Henrik Warne henrik warne logging blog https://henrikwarne.com/tag/dry-run/ dry-run | Henrik Warne's blog Posts about dry-run written by Henrik Warne henrik warne dry run blog https://henrikwarne.com/2020/08/30/deployed-to-production-is-not-enough/ Deployed To Production Is Not Enough | Henrik Warne's blog You have developed a new feature. The code has been reviewed, and all the tests pass. You have just deployed this new feature to production. So on to the next... henrik warne deployed production enough blog https://henrikwarne.com/tag/book-review/ book review | Henrik Warne's blog Posts about book review written by Henrik Warne book review henrik warne blog https://henrikwarne.com/2012/02/25/favorite-programming-quotes/ Favorite Programming Quotes | Henrik Warne's blog Here are a few programming quotes I like: “A complex system that works is invariably found to have evolved from a simple system that worked.” John Gall... henrik warne favorite programming quotes blog https://henrikwarne.com/tag/creativity/ creativity | Henrik Warne's blog Posts about creativity written by Henrik Warne henrik warne creativity blog https://henrikwarne.com/2015/01/01/coursera-course-review-computational-investing-part-1/ Coursera Course Review: Computational Investing Part 1 | Henrik Warne's blog I recently finished the Coursera course Computational Investing Part 1 by professor Tucker Balch at Georgia Tech. The focus of the course is on portfolio... course review henrik warne coursera computational investing https://henrikwarne.com/2013/02/18/coursera-algorithms-course-part2/ Coursera course review: Algorithms: Design and Analysis, Part 2 | Henrik Warne's blog I recently finished the Coursera course Algorithms: Design and Analysis, Part 2 by Professor Tim Roughgarden of Stanford. I’ve already reviewed part 1, and... course review henrik warne coursera algorithms design https://henrikwarne.com/2013/08/31/7-ways-more-methods-can-improve-your-program/ 7 Ways More Methods Can Improve Your Program | Henrik Warne's blog A lot of code I come across consists of relatively few, but long, methods. The code does what it is supposed to do. However, it could be improved a lot.... henrik warne ways methods improve program https://henrikwarne.com/2013/12/08/tdd-unit-tests-and-the-passage-of-time/ TDD, Unit Tests and the Passage of Time | Henrik Warne's blog Many programmers have a hard time writing good unit-tests for code that involves time. For example, how do you test time-outs, or periodic clean-up jobs? I... unit tests henrik warne tdd passage time https://henrikwarne.com/tag/integration-testing/ integration testing | Henrik Warne's blog Posts about integration testing written by Henrik Warne integration testing henrik warne blog https://henrikwarne.com/tag/test-driven-development/ test-driven development | Henrik Warne's blog Posts about test-driven development written by Henrik Warne test driven development henrik warne blog https://henrikwarne.com/tag/interview/ interview | Henrik Warne's blog Posts about interview written by Henrik Warne henrik warne interview blog https://henrikwarne.com/tag/unit-testing/ unit testing | Henrik Warne's blog Posts about unit testing written by Henrik Warne unit testing henrik warne blog https://henrikwarne.com/2018/12/03/developer-on-call/ Developer On Call | Henrik Warne's blog For the system at work, I am on call one week every seven weeks. For most of the past ten years, I have been on organized on call rotations for the systems I... henrik warne developer call blog https://henrikwarne.com/2018/06/25/6-git-aha-moments/ 6 Git Aha Moments | Henrik Warne's blog When I switched jobs four years ago, I went from using subversion (svn) to using git as the version control system. Even though I am a pretty quick learner, it... henrik warne git aha moments blog https://henrikwarne.com/tag/linkedin/ linkedin | Henrik Warne's blog Posts about linkedin written by Henrik Warne henrik warne linkedin blog https://henrikwarne.com/2014/09/04/a-response-to-why-most-unit-testing-is-waste/ A Response to “Why Most Unit Testing is Waste” | Henrik Warne's blog A few months ago I came across the article Why Most Unit Testing is Waste by James O Coplien. The title is an accurate description of the contents – James... unit testing henrik warne response blog https://henrikwarne.com/tag/software-development/ software development | Henrik Warne's blog Posts about software development written by Henrik Warne software development henrik warne blog https://henrikwarne.com/tag/algorithms/ algorithms | Henrik Warne's blog Posts about algorithms written by Henrik Warne henrik warne algorithms blog