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

# `and` and `OR`

We can combine conditions that go right after the `if` statement. Sometimes, we need to perform multiple checks:

```
if ...
  puts ...
end
```
There are two ways of combining the conditions: `AND` and `OR`. Each way can be represented by the characters `&&` (double ampersand) and `||` (double pipe).


## Example



# Combining Conditions

puts 1 == 1 && 2 == 2 # it will display true because both conditions are true
puts 1 == 5 && 2 == 2 # it will display false because 1st condition is false
puts 1 == 5 || 2 == 2 # it will display true because OR opearator is used and one condition is true

## Explanation

It is important to note that we can also use the `and` keyword instead of `&&`, and employ `or` instead of `||`. However, tools like Rubocop do not recommend doing that, saying: “The minimal added readability is just not worth the high probability of introducing subtle bugs.”


The first example above is quite clear. We just need to check if “one equals one and two equals two,” and the result should be `true`.


The next condition is more interesting, the first part checks if “one equals five,” which gives us `false`, and the second part checks if “two equals two,” which gives us `true`. The final condition sounds like “Is false and true, true?” It’s like a situation where we ask two of our friends something, and one of them lies, and the other tells the truth. Will we end up with a 100% true value? No, we won’t. The second condition will never be executed if the first condition is `false`. The Ruby interpreter will save our resources, because we use `&&`.


The third condition is almost the same. We use `||` (`or`) to combine a `true` and a `false` condition. So over here, we’re interested in one or another result. If either of them is `true`, our condition will be passed. Let’s consider another example of combining conditions:

>**Note**: We will enter our `age` and `y` or `n` on separate lines in the input box below before pressing the “Run” button.

Learn to use the AND and OR operators in the if statements.


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

Combining Conditions

`and` and `OR`

Combining Conditions

and and OR

`and` and `OR`