Gain insights into Ruby development with 78 tasks tailored for beginners and experienced coders. Explore object-oriented concepts, debug programs, and advance your freelance coding career.

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This self-study course written as a book is your first step towards making money by coding and programming from home, and having fun doing it. You will understand how the Ruby language works, and establish a foundation for being a successful freelance developer. This course gives you not only technical detail, but presents knowledge in a friendly format, understandable by all ages, providing a thorough explanation of modern concepts for absolute beginners.

In this course you will find 78 easy to follow tasks, so even people without any programming skill can solve them. Beginners will learn how to create, debug, and understand programs in Ruby. Those who are already familiar with the language will rediscover object-oriented concepts, memory organization, find career advice, and save the planet from a nuclear apocalypse.

Ready to dive into one of the most influential and demanding third generation programming languages? Let's tune in!

The Handbook for Ruby Developers

# Definition
A **module** is a chunk of code we can include in a class or in another module:

# MyModule contains logic for robot, human, and dog

module MyModule
  attr_accessor :x, :y

  def initialize(options={})
    @x = options[:x] || 0
    @y = options[:y] || 0
  end

  def right
    self.x += 1
  end

  def left
    self.x -= 1
  end

  def up
    self.y += 1
  end

  def down
    self.y -= 1
  end
end

class Robot
  include MyModule

  def label
    '*'
  end
end

class Dog
  include MyModule

  def up
  end

  def left
  end

  def label
    '@'
  end
end

class Human
  include MyModule

  def label
    'H'
  end
end

In the program above, we define the module with the `module... end` syntax and include the `module` in our classes with the `include` keyword. A class diagram would look like this:

Learn what are modules and how to use them in Ruby.

Before We Begin

First Steps

Fundamentals of Ruby

Conditional Statements

Operators and Methods

Arrays

Hash

Fun with Object Oriented Programming

Debugging in Ruby

Ruby Version Manager

Testing Ruby Programs

Wrap Up!

Appendix

Modules

Definition