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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

Object is the synonym for "class" in computer programming

Select the correct statement below.

The state is a programming structure that repeats a sequence of instructions until a specific condition is met.

The Unix or Linux system call to create a new process from an existing running process.

The state is an electronic or electromechanical hardware device that can be used to enter data into, and transcribe data from, a computer or a computing system.

A system is described as stateful if it is designed to remember preceding events or user interactions,and the remembered information is called the state of the system.

Given the Ruby program below, what will be printed on the screen?
```ruby
print 100
print "\e[H\e[2J"
puts 500

Given the Ruby program below, what will be printed on the screen?
<pre><code class="language-ruby">print 100
print &quot;\e[H\e[2J&quot;
puts 500</code></pre>

The ability of objects to act in different ways based on their class or data type.

The bundling of data with the methods that operate on that data, or the restricting of direct access to some of an object's components

The ability of an object to take on one or more characteristics from other classes of objects

The ability of an object to take on one or more characteristics from other classes of objects.



The bundling of data with the methods that operate on that data, or the restricting of direct access to some of an object's components.

What is the concept of Iinheritance?

An expression that makes it possible to unpack values from arrays, or properties from objects, into distinct variables.


The objects need to be collected by the garbage collector immediately.

A way to group together methods, classes, and constants.

Given the Ruby program below, what will be printed on the screen?
```ruby
class Megaphone
  def shout
    puts 'friend'
  end

  def self.shout
    puts 'hello'
  end
end

Megaphone.shout

Given the Ruby program below, what will be printed on the screen?
<pre><code class="language-ruby">class Megaphone
 def shout
 puts 'friend'
 end

 def self.shout
 puts 'hello'
 end
end

Megaphone.shout</code></pre>

The programming paradigm based on the concept of "objects." However, it does not generate advantages of great orders of magnitude.

The solution to all computer science problems.

The cheap way to organize your code and deliver quick results.

What is Object-oriented programming?

Take a quiz on Object-oriented programming" before moving on to the next chapter.

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

Quiz: Object-oriented Programming