Rubocop for linting in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Rubocop in Ruby programming?

Rubocop is a tool that checks Ruby code for style and errors. It helps keep code clean and consistent by pointing out problems and suggesting fixes.

beginner

How do you run Rubocop on your Ruby project?

You run Rubocop by typing rubocop in the terminal inside your project folder. It will scan your Ruby files and show any style or error warnings.

intermediate

What does Rubocop's auto-correct feature do?

Rubocop can fix some style problems automatically when you run rubocop -a. This saves time by correcting simple issues for you.

intermediate

What is a Rubocop configuration file and why is it useful?

A Rubocop configuration file (.rubocop.yml) lets you customize which rules to check or ignore. It helps teams agree on coding style and avoid unwanted warnings.

beginner

Name two benefits of using Rubocop in your Ruby projects.

1. It keeps code style consistent, making code easier to read.<br>2. It finds potential bugs or bad practices early, improving code quality.

What command runs Rubocop to check your Ruby files?

A lint-rb

B ruby lint

C check-ruby

D rubocop

The correct command to run Rubocop is simply rubocop.

Which file does Rubocop use to customize its rules?

A .rubocop.yml

B rubocop.config

C config.rb

D rubocop.json

Rubocop uses a YAML file named .rubocop.yml to set custom rules.

What does the -a option do when running Rubocop?

A Adds new rules to Rubocop

B Automatically fixes some style issues

C Analyzes code without showing output

D Runs Rubocop in debug mode

The -a flag tells Rubocop to auto-correct fixable problems.

Why is using Rubocop helpful for a team of developers?

A It enforces a consistent coding style

B It compiles Ruby code faster

C It replaces the need for tests

D It manages project dependencies

Rubocop helps teams keep code style consistent, making collaboration easier.

Which of these is NOT a feature of Rubocop?

A Linting Ruby code

B Auto-correcting style issues

C Running Ruby unit tests

D Customizing rules via config file

Rubocop does not run tests; it only checks code style and errors.

Explain what Rubocop does and how it helps Ruby developers.

Think about how Rubocop improves code quality and consistency.

Describe how you would set up and run Rubocop in a new Ruby project.

Consider the steps from installation to checking code.