// TODO: write actual code

Debugging at 3 AM

2012-03-15 | Alex Kucherenko | 2 min read
Ця стаття ще не перекладена вашою мовою.

There's a special kind of clarity that comes at 3 AM. The office is empty, the Slack channels are silent, and the only sound is the quiet hum of your monitor and the occasional click of a mechanical keyboard. You've been chasing this bug for six hours. Your coffee went cold two hours ago. You don't care. You're close.

The bug is one of those beautiful, maddening creatures that only manifests in production, only on Tuesdays, and only when the user's name contains a Unicode character. You've narrowed it down to a string comparison deep inside a sorting function that someone wrote in 2009 and marked with a comment that reads "temporary fix." Three years later, it's load-bearing architecture.

The Bargaining Phase

At some point during a late-night debug session, you start making deals with the universe. "If I find this bug in the next ten minutes, I'll write proper tests for the entire module." You won't, of course. But the promise feels real in the moment, the way New Year's resolutions feel real on January 1st.

You add another console.log. Then another. Your terminal looks like the Matrix, except instead of falling green characters, it's an avalanche of [DEBUG] value is: undefined. You briefly consider adding a console.log inside the console.log to debug why the console.log isn't showing what you expect. This is the moment you should go to sleep. You add the log anyway.

The Breakthrough

And then it happens. At 3

AM, between your nineteenth coffee and your third existential crisis, you see it. A single character. A = where there should be ===. The kind of bug that would take thirty seconds to find in a code review but six hours to find in the wild. You fix it, run the tests, and everything passes. You feel like a genius and an idiot simultaneously -- a state of being that, honestly, describes most of programming.

You commit the fix with a message that reads "fix string comparison" and go to bed, knowing full well that tomorrow someone will ask why such a simple fix took an entire evening. You'll shrug and say "it was tricky to reproduce." They'll nod. They've been there too.