God Class: How to Spot and Refactor a Class That Does Everything (video)

A god class knows too much and changes for every reason. Learn the warning signs, why it slows teams down, and a safe step-by-step way to split it using the Single Responsibility Principle.

Read the full article

Transcript

God Class: How to Spot and Refactor a Class That Does Everything. Here's the short version.

Every codebase has one: OrderManager, Utils, or AppService, thousands of lines long, imported everywhere, and touched by every pull request. That is a god class, a class that holds too much of the system's logic.

Warning signs. Hundreds or thousands of lines, and dozens of public methods. Many unrelated dependencies injected into the constructor. Method groups that never use each other's fields. A vague name: Manager, Helper, Utils, Service, Processor.

Here's an example: Pricing, persistence, payments and notifications in one place.

Why it hurts. A class with many responsibilities has many reasons to change, so unrelated features collide in the same file. Tests need large setups because every method shares the same dependencies.

Split it step by step. First, group the methods by what they use and why they change (pricing, storage, messaging...). Second, pick the most independent group and move it into a new class with Extract Class. Third, keep the old method as a one-line call to the new class so callers keep working. Fourth, move callers over gradually, then delete the forwarding method.

Want to find these issues in your own code? Connect your GitHub repository to CodeInspector. You'll get findings with the file, line, severity, and a recommended fix, plus HTML and PDF reports for your team. Start free at codeinspector.app.

More videos

All videos