Software Development

You open a function to fix a one-line bug and forty minutes later you’re still tracing which branch sets which variable. Three unrelated jobs are welded into one block, and none of them has a name. Pull one thread and you can’t tell which others move. That is spaghetti code, and the name has nothing to do with indentation or naming style. It describes control flow: execution jumps between conditions the way one strand of pasta crosses every other strand in the bowl, and following a single path to its end means holding four levels of if in your head at once. ...

Debugging a bug that only happens on a machine without Visual Studio A bug reproduces on the test server and not on your laptop. The test server has no Visual Studio, and installing a full IDE there to set one breakpoint isn’t an option. Remote debugging is built for this case. A small standalone program runs on the target machine, your local Visual Studio connects to it over the network, and you get breakpoints and variable inspection on a process that isn’t running anywhere near your desk. ...

The test suite has been green for three weeks. Today npm test fails on an assertion that has nothing to do with what you just changed, and git log v1.4.0..HEAD shows 340 commits from four people since the last release anyone is sure worked. Reading every diff costs you a day. Checking out commits at random is faster and still not a plan. git bisect turns that into a binary search. You give it one commit you know is good and one you know is bad; it checks out the commit halfway between them and waits while you test that single commit and report back. Each answer halves the range. 340 commits resolve in at most 9 tests, since 2^9 = 512. ...

You pull the latest main and Git stops with CONFLICT (content): Merge conflict in checkout.js. You resolve it, and the log now shows a commit called Merge branch 'main' into feature/checkout sitting on top of the three commits you actually wrote. Four commits, one real change. A teammate reading that history next month can’t tell which is which. git merge and git rebase both answer the same question: how do I bring my branch up to date with changes made elsewhere. They leave very different traces behind, and picking the wrong one on a shared branch causes real damage. ...

What Docker actually does Docker is an open source platform that packages an application with everything it needs to run — code, libraries, runtime, configuration — into a container that behaves the same on any machine. Moving house makes the trade-off concrete. You have two options: Carry all your belongings loose, hoping they arrive intact Put everything in organized, labeled boxes that are easy to move Docker does exactly this with software applications: it “packages” them into containers that contain everything they need to run. ...