Question 1

How to define a class in Ruby?

Accepted Answer

In Ruby, a class is defined with the class keyword followed by the class name (CamelCase by convention) and ends with end. The initialize method serves as the constructor and is automatically called when creating a new instance with Class.new. Instance variables (prefixed with @) store the state of each object.

Question 2

What is the role of the initialize method in Ruby?

Accepted Answer

The initialize method is the constructor in Ruby. It is automatically called when a new object is created via Class.new. It allows initializing instance variables and setting up the initial state of the object. Unlike other languages, the constructor is not named after the class but is always called initialize.

Question 3

What is the difference between attr_reader, attr_writer and attr_accessor?

Accepted Answer

These three class methods automatically generate accessors. attr_reader creates only a getter (read), attr_writer creates only a setter (write), and attr_accessor creates both at once. This avoids manually writing repetitive getter/setter methods, making the code more concise and readable.

Ruby Object-Oriented Programming

How to define a class in Ruby?

Câu trả lời

What is the role of the initialize method in Ruby?

Câu trả lời

What is the difference between attr_reader, attr_writer and attr_accessor?

Câu trả lời

How does class inheritance work in Ruby?

What is the difference between a module and a class in Ruby?

Các chủ đề phỏng vấn Ruby on Rails khác

Ruby Basics

Rails Fundamentals

Routing & Controllers

ActiveRecord Basics

Views & ERB Templates

ActiveRecord Associations

Advanced ActiveRecord Queries

Rails Forms

Authentication & Authorization

Modern Asset Pipeline & Frontend

Rails API Mode

Testing with RSpec

ActiveJob & Background Jobs

ActionCable & WebSockets

ActionMailer

ActiveStorage

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Advanced Migrations

Rails Engines & Modular Apps

Performance Optimization

Rails Design Patterns

Ruby Metaprogramming

Rails Security

GraphQL with Rails

Deployment & Production

Monitoring & Logging

Rails Upgrade Strategies

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