Small Dev Habit: Keep Code Changes Focused

To keep code changes focused, adopt the habit of making one logical change per commit, and review your diff before committing to ensure it contains only that change. This means separating refactoring, formatting, and unrelated fixes into their own commits, even if they touch the same file. This practice makes code review faster, debugging easier, and the project history more readable.

Formula

The focus score is a simple heuristic to gauge whether a change is too large or too small relative to your typical commit. It is calculated as:

Score = (Time spent / 30) + (Files changed / 5) + (Lines changed / 100)

• Time spent (t) – minutes you worked on this change (default 30).
• Files changed (f) – number of files modified (default 5).
• Lines changed (l) – total lines added plus deleted (default 120).

The score is unitless. A score of 3.0 or lower suggests the change is reasonably focused. A score above 4.0 often indicates the change mixes multiple concerns.

Worked Example

Using the default values: you spent 30 minutes, changed 5 files, and touched 120 lines.

1. Time component: 30 / 30 = 1.0
2. Files component: 5 / 5 = 1.0
3. Lines component: 120 / 100 = 1.2
4. Total score: 1.0 + 1.0 + 1.2 = 3.2

The calculator shows 3.2, which is just above the “focused� threshold. If you had changed 3 files and 60 lines, the score would be 1.0 + 0.6 + 0.6 = 2.2 – a more focused change.

Why Focused Changes Matter

Software development is a team activity, and the commit history is the shared memory of the project. When you make a commit that does only one thing, you give your teammates (and your future self) a clear, atomic unit of work that can be reviewed, tested, and, if necessary, reverted without side effects. Unfocused commits – those that bundle a bug fix with a refactor and a formatting change – make code review a guessing game. Reviewers cannot easily tell which change caused a regression, and reverting one part becomes impossible without reverting the whole commit.

How to Practice This Habit

Start by breaking your work into smaller logical steps before you even open your editor. For example, if you are adding a new feature, you might create three separate commits:

• Add the database migration.
• Implement the backend API endpoint.
• Build the frontend UI component.

When you finish a step, run git diff to review exactly what you have changed. Ask yourself: does every line in this diff relate to the step I just completed? If you spot an unrelated typo or a formatting fix, make a separate commit for it. If you find yourself mixing a refactor with a feature, use git add -p to stage only the hunks that belong to the current commit.

Common Obstacles and How to Overcome Them

One common obstacle is the temptation to “fix things as you go.� You notice a variable name that is unclear, so you rename it while adding your feature. That rename is a refactor, and it should be in its own commit. Overcome this by keeping a running list of small issues you notice, and address them in a dedicated “chore� or “refactor� commit after you finish the feature.

Another obstacle is the pressure to commit quickly. When you are in flow, stopping to stage hunks feels like friction. But the 30 seconds it takes to split a commit saves minutes later when someone tries to understand the history. If you are using a tool like GitKraken or the VS Code Git interface, you can stage individual hunks with a few clicks.

Finally, some developers worry that too many commits make the history noisy. The opposite is true: a commit that says “Fix typo in login error message� is far more useful than a commit that says “Update login flow� and includes 10 unrelated changes.

Comparing to Other Practices

Focused commits are closely related to the “single responsibility principle� from software design, but applied to version control. They also complement trunk-based development, where small, frequent commits are the norm. In contrast, feature branches with large, infrequent commits make code review a marathon and increase the likelihood of merge conflicts. Some teams use conventional commit prefixes (like feat:, fix:, refactor:) to make the intent of each commit explicit. This works best when combined with focused changes – a commit labeled refactor: should not also contain a bug fix.

Costs and Trade-offs

The main cost of this habit is the extra time spent staging and splitting changes. For a developer who is used to committing everything at once, it can feel like a slowdown. However, the time is usually recovered during code review, because reviewers can approve or reject each commit independently. Another trade-off is that you may end up with commits that do not compile on their own (e.g., a migration without the code that uses it). To mitigate this, try to keep each commit in a state where the project still builds and tests pass. This is not always possible, but it is a good target.

Frequently Asked Questions

What if I already made a large, messy commit?

If the commit has not been pushed, you can reset it with git reset HEAD~1 and then re-commit in smaller pieces. If it has been pushed, you can use git revert to undo the whole commit and then re-apply the changes in focused commits. For a long-pushed commit that is not causing problems, it is often simpler to leave it and start fresh with the new habit.

How small is too small?

A commit that changes one line to fix a typo is perfectly fine. A commit that is empty (no changes) is not. There is no lower limit, but each commit should represent a complete logical unit. If you find yourself making a commit for every keystroke, you are probably overdoing it.

Does this work for solo projects?

Yes, even if you are the only developer, focused commits help you navigate your own history. When you revisit a feature after six months, you will thank yourself for being able to see exactly which change introduced a bug.

How do I handle auto-formatters that change many lines?

Run the formatter on the whole file as a separate commit before you start your feature. Then your feature commit will only contain the actual logic changes. If you use a tool like Prettier, you can also configure it to run only on changed lines, but that is less common.

What about merge commits?

Merge commits are not “changes� in the same sense; they bring two branches together. The habit applies to the commits you author, not to merges. However, keeping your own commits focused makes merges less painful because there is less conflicting code.

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in t | Time spent on change (min) | min | 30 | 0
in f | Files changed | - | 5 | 1
in l | Lines changed | - | 120 | 1
out s | Focus score (lower is better) | - | (t / 30) + (f / 5) + (l / 100) | 2