Classes

Create a class

initialize runs when you call new.

class User
  def initialize(name)
    @name = name
  end

  def label
    "User: #{@name}"
  end
end

u = User.new("Ada")
puts u.label

Attribute readers

Helpers expose instance variables cleanly.

class Course
  attr_reader :title
  attr_accessor :lessons

  def initialize(title, lessons)
    @title = title
    @lessons = lessons
  end
end

Class methods

Use self. for methods on the class itself.

def self.demo
  Course.new("Ruby", 18)
end

Class tips

• Instance variables start with @
• Prefer attr_reader / attr_accessor over public @ access
• One class per file is a common pattern
• Inheritance uses <