MCQs on Ruby Best Practices | Ruby

This chapter explores essential Ruby best practices, including coding conventions with RuboCop, writing clean and maintainable code, and effectively using Git in Ruby projects. Improve your skills!

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Topic 1: Coding Conventions and Style Guide (RuboCop)

1. What is RuboCop used for in Ruby?
   a) Debugging Ruby code
   b) Enforcing coding standards and style guides
   c) Optimizing Ruby performance
   d) Managing Ruby project dependencies
2. What does RuboCop check for in Ruby code?
   a) Syntax errors
   b) Coding style violations
   c) Memory leaks
   d) Runtime errors
3. What is the default configuration file for RuboCop?
   a) .rubocop.yml
   b) .ruby_style
   c) rubocop_config.yml
   d) style_config.yml
4. Which of the following RuboCop commands is used to auto-correct violations?
   a) rubocop --fix
   b) rubocop --auto-correct
   c) rubocop -c
   d) rubocop --style
5. How do you exclude files or directories from being analyzed by RuboCop?
   a) By adding them to .gitignore
   b) By specifying them in .rubocop.yml
   c) By passing --exclude flag
   d) By removing them from the project
6. Which rule does RuboCop enforce regarding method length by default?
   a) Methods should not exceed 20 lines
   b) Methods should be limited to 50 lines
   c) Methods should not exceed 10 lines
   d) Methods can be any length
7. What type of tool is RuboCop?
   a) A static code analysis tool
   b) A runtime performance analyzer
   c) A test suite for Ruby code
   d) A dependency manager for Ruby
8. How can you disable a specific RuboCop rule for a single line?
   a) # rubocop:disable RuleName
   b) # rubocop:disable
   c) # rubocop:off
   d) # rubocop:skip RuleName
9. What is the main benefit of following a style guide enforced by RuboCop?
   a) It improves the speed of the Ruby interpreter
   b) It ensures code readability and consistency across projects
   c) It helps to avoid runtime errors
   d) It guarantees better test coverage
10. Which configuration option in RuboCop is used to set the target Ruby version?
    a) TargetRubyVersion
    b) RubyVersion
    c) RubyTarget
    d) RubyVersionSet

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Topic 2: Writing Clean and Maintainable Code

11. What is the primary goal of writing clean code in Ruby?
    a) To make the code run faster
    b) To minimize the number of lines of code
    c) To make the code easy to understand and maintain
    d) To maximize memory usage
12. Which of the following is a characteristic of clean code?
    a) It is complex and hard to understand
    b) It uses many nested loops and conditionals
    c) It is simple, readable, and easy to maintain
    d) It avoids using any Ruby libraries
13. Which of the following is a good practice for writing maintainable Ruby code?
    a) Writing very long methods to avoid repetition
    b) Using meaningful and descriptive method and variable names
    c) Avoiding comments and documentation
    d) Writing all code in a single file
14. What does the “Single Responsibility Principle” (SRP) in clean code state?
    a) A method should perform more than one task
    b) Each class should have only one reason to change
    c) A file should contain all classes for easy access
    d) Code should never be reused
15. Which of the following is a practice for keeping Ruby code DRY (Don’t Repeat Yourself)?
    a) Writing multiple similar methods
    b) Refactoring common logic into reusable methods
    c) Writing larger methods for more functionality
    d) Using copy-pasting for code reuse
16. What is the recommended length for methods in clean Ruby code?
    a) Methods should be as long as possible
    b) Methods should be 100 lines or more
    c) Methods should be short and focused, typically under 20 lines
    d) Methods should be around 50 lines
17. Why should you avoid using magic numbers in Ruby code?
    a) They make the code harder to understand and maintain
    b) They improve the performance of the code
    c) They simplify the code
    d) They reduce the number of lines in the code
18. What is the role of comments in clean code?
    a) Comments should be used to explain every line of code
    b) Comments are unnecessary in clean code
    c) Comments should explain the “why” behind complex or unclear code
    d) Comments should replace meaningful variable names
19. Which of the following helps improve code readability and maintenance?
    a) Using ambiguous variable names
    b) Writing long, complex functions
    c) Using consistent indentation and naming conventions
    d) Avoiding the use of helper methods
20. What is “refactoring” in the context of writing maintainable Ruby code?
    a) Deleting unnecessary lines of code
    b) Rewriting the code to improve its structure and readability without changing its behavior
    c) Adding new features to the code
    d) Converting the code to another programming language

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Topic 3: Effective Use of Git in Ruby Projects

21. Which Git command is used to initialize a new Git repository in a Ruby project?
    a) git start
    b) git init
    c) git create
    d) git setup
22. What does git status show in a Ruby project?
    a) The current branch and changes to be committed
    b) The commit history of the project
    c) The files included in the .gitignore file
    d) The list of contributors to the repository
23. What is the purpose of .gitignore in a Ruby project?
    a) It defines which files should be ignored by Git
    b) It keeps track of the project’s commit history
    c) It lists contributors to the project
    d) It contains the project’s dependencies
24. What is the correct command to stage all changes in a Ruby project for commit?
    a) git add .
    b) git commit -a
    c) git push .
    d) git stage all
25. How do you create a new branch in Git for a Ruby project?
    a) git branch new_branch
    b) git create new_branch
    c) git checkout -b new_branch
    d) git new branch new_branch
26. What does git merge do in a Ruby project?
    a) It creates a new branch
    b) It combines changes from one branch into another
    c) It removes a branch
    d) It commits changes to the current branch
27. Which command is used to commit changes in Git with a message?
    a) git commit -m "message"
    b) git push -m "message"
    c) git add -m "message"
    d) git message "message"
28. What is a “pull request” (PR) in Git?
    a) A request to delete a file from the repository
    b) A way to propose changes and request to merge them into a different branch
    c) A command to pull the latest code from the repository
    d) A request to create a new repository
29. What is the purpose of a “commit” in Git?
    a) To track changes in the file system
    b) To save changes to the local repository with a descriptive message
    c) To push changes to the remote repository
    d) To merge branches
30. What is the role of a Ruby Gem in a Git project?
    a) It tracks changes in the project
    b) It stores the project’s source code
    c) It provides additional functionality or libraries to the project
    d) It manages the project’s branches

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Answers Table

QNo	Answer
1	b) Enforcing coding standards and style guides
2	b) Coding style violations
3	a) .rubocop.yml
4	b) rubocop --auto-correct
5	b) By specifying them in .rubocop.yml
6	a) Methods should not exceed 20 lines
7	a) A static code analysis tool
8	a) # rubocop:disable RuleName
9	b) It ensures code readability and consistency across projects
10	a) TargetRubyVersion
11	c) To make the code easy to understand and maintain
12	c) It is simple, readable, and easy to maintain
13	b) Using meaningful and descriptive method and variable names
14	b) Each class should have only one reason to change
15	b) Refactoring common logic into reusable methods
16	c) Methods should be short and focused, typically under 20 lines
17	a) They make the code harder to understand and maintain
18	c) Comments should explain the “why” behind complex or unclear code
19	c) Using consistent indentation and naming conventions
20	b) Rewriting the code to improve its structure and readability without changing its behavior
21	b) git init
22	a) The current branch and changes to be committed
23	a) It defines which files should be ignored by Git
24	a) git add .
25	c) git checkout -b new_branch
26	b) It combines changes from one branch into another
27	a) git commit -m "message"
28	b) A way to propose changes and request to merge them into a different branch
29	b) To save changes to the local repository with a descriptive message
30	c) It provides additional functionality or libraries to the project