Rails
The .to_i that ate the 0.5
A statutory payroll rate rose from 3% to 3.5%, and every calculator kept giving the old answer. One silent whole-number assumption, written into the loader, the templates and the browser code, explains why.
A journal for the curious developerGood code.
Good code.
Better stories.
Things we build. Things we break.
And everything we learn along the way.
The written side / featured article
The .to_i that ate the 0.5
A statutory payroll rate rose from 3% to 3.5%, and every calculator kept giving the old answer. One silent whole-number assumption, written into the loader, the templates and the browser code, explains why.
Watch. Read. Build.
Follow the ideas all the way through.
Follow the ideas all the way through.
Notes from the workbench
All articles
Behind the code.
Infrastructure
The config key that discarded my Chrome flags, and a hang that wasn't
One plausible wrong config key left every Chrome flag I set unread for nearly six months, hidden by two lines in an old deploy script. When the deploy changed, Chrome died in a tenth of a second in my rebuil...
ChatGPT
Cross-Project Auditing with Parallel AI Agents: A Methodology for Multi-Service Codebases
When enhancement work spans multiple applications and rendering services, how do you systematically verify that everything was implemented correctly? This article describes a methodology where parallel resea...
Ruby
The Guard Clause Pattern That Changed How I Write Controllers
Discover an elegant pattern for Rails controller validation logic using `performed?` checks after each validation method. This approach keeps validation logic focused and testable while maintaining clear con...