Sometimes I write code that works correctly, but when I return to it a few days later, I struggle to remember what I was trying to accomplish. What practices help make code easier to read and maintain? Should I focus mainly on descriptive variable names, smaller single-purpose functions, comments, formatting tools, or something else?
4 Answers
The most valuable comments explain why the code exists or why it takes an unusual approach, not what each line is already doing. The syntax shows what happens, but it usually cannot preserve your reasoning. A note such as “use this approach because the standard one fails in a particular browser” can prevent someone from changing it back later. Names and structure should explain the normal behavior; comments should preserve important context and constraints.
Start with clear names and functions that do one thing. If a function is handling several unrelated tasks, split it up and give each part a name that makes its purpose obvious. Comments are most useful as a last resort, especially when the code has an unusual reason behind it. Also, don’t be too hard on yourself—code you wrote a few days ago can feel like it came from a stranger.
Use standard formatting and linting tools so the code follows a familiar baseline and common problems are caught early. Refactoring can improve code, but first make sure you understand what it currently does. When you are still learning, detailed comments can help you preserve your reasoning; over time, aim to replace comments that merely describe the code with better names and clearer structure.
Make the code explain itself as much as possible. Descriptive names, consistent formatting, and small functions are usually more useful than long blocks of comments. It can even be worthwhile to assign a computed value to a separate variable just to give the concept a meaningful name. Comments are still helpful for documenting assumptions, program state, or non-obvious constraints—for example, what format a buffer contains at a particular point.
That makes sense. I often remember what the code does but forget why I avoided the obvious solution, so documenting that decision would probably help the most.