As someone who loves discussing Software Craftsmanship and best practices, Test Driven Development (TDD) is a bit of a sore spot for me. Let me start off by saying that I love TDD’s emphasis on testing. Too many software projects skimp on testing. And the results speak for themselves many years down the road, when … Continue reading Mutation Driven Testing – When TDD Just Isn’t Good Enough
Tag: programming
Why Is There So Much Crap Software In The World
All around us, we are surrounded by crappy software. Pension funds that are stumbling along using decades old batch scripts with faulty assumptions. Credit agencies leaking over a hundred million social security numbers and other confidential data. And not to even mention the tons of buggy and frustrating software that we see all around us, … Continue reading Why Is There So Much Crap Software In The World
Preventing Software Rot
I recently came across a story that is just as amusing as it is shocking: One of my clients is responsible for several of the world's top 100 pension funds. They had a nightly batch job that ... crashed. No one knew what was wrong at first. This batch job had never, ever crashed before, … Continue reading Preventing Software Rot
Bayes vs Frequentists – An Empirical Test In Code
You and your friend are walking by a magic store and find a trick coin. You have no clue how biased the coin is, and decide that all possible levels of bias are equally likely. In order to estimate the level of bias, you toss it 14 times and end up with 10 heads. Your … Continue reading Bayes vs Frequentists – An Empirical Test In Code
When Feature Flags Do And Don’t Make Sense
Over the past years, I’ve worked in multiple teams adopting very different strategies when it comes to feature flags. I’ve seen the pros and cons of both, and over time, I found myself disagreeing with any fundamentalist position on their use. There is a lot of nuance to this topic, and I think it is … Continue reading When Feature Flags Do And Don’t Make Sense
Abstractions Are In The Eye Of The Beholder
One of the most common debates I see, is on the right level of abstraction to use when coding. The line between over-engineered and unnecessarily-verbose is a very fuzzy one, and is the source of never-ending debates. Unfortunately, this debate is unlikely to ever get resolved. For one simple reason. The correct answer is both … Continue reading Abstractions Are In The Eye Of The Beholder
Alert Fast
A dichotomy I often see in many different teams and projects, is the dilemma between “failing fast” and “failing gracefully.” Here’s a simplified example of what I see far too often, and gets to the core of the dilemma. public String generateGreeting() { try { return “Hello ” + getName(); } catch (Exception e) { … Continue reading Alert Fast
SSH Considered Harmful – Why You Should Be Using Persistent Sessions
No, there hasn't been any new vulnerability found in SSH, nor am I denying the usefulness of SSH as a building block in the dev toolchain. This article is about why you shouldn't be (and how you can avoid) using raw SSH sessions for development work. Here’s a little story. I spent many years working … Continue reading SSH Considered Harmful – Why You Should Be Using Persistent Sessions
Rethinking Software Testing: Perspectives from the world of Hardware
The conventional view of Software Testing The hardware and software worlds may seem poles apart, and in many ways, they indeed are. But there’s a wealth of knowledge that each can learn from the other. Despite the seemingly massive differences in the final product, they share more in common than you might expect. Computer engineers … Continue reading Rethinking Software Testing: Perspectives from the world of Hardware
An Alternative to Dependency Injection Frameworks
I have a confession to make. I hate Dependency Injection (DI) frameworks. My very first job as a Software Engineer involved working with a very complex system that powered a ~100 person hedge fund. We made extensive use of Dependency Injection… but only via Constructor or Setter Injection. We did not use any DI frameworks … Continue reading An Alternative to Dependency Injection Frameworks
