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

Now, it’s time for us to practice and review everything we know about methods.
# Judgment day

Machines have taken over the world. There is a struggle for survival. Who will survive: humanity or machines? It’s up to destiny to decide our future. Well, actually, it’s up to the random number generator.
The program will show the stream of upcoming events happening in the world. It would be much more interesting if we could show these events with some graphics, but the observer’s imagination will have to suffice for now.


>**Note**: This program can be written in a better way. However, we still only have a limited knowledge of how Ruby works, so our goal is to practice using it rather than deliver a piece of art.

# Solution

First, let’s agree that there are only 10,000 humans and 10,000 machines are left. With every iteration, we’ll have only one random event. The number of humans and machines will decrease with the same probability. Victory will be achieved when no more machines or humans are left. Now, let’s proceed with a solution.

## Main loop

We’ll start with the definition of victory and the main loop with two variables:




Let's practice what we have learned so far about methods with a game.

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

Judgment Day Emulator

Judgment day