Explore OOP in Ruby to gain a deeper understanding of Ruby objects, Ruby methods, and Ruby classes, enabling you to solve multiple problem sets with an object-oriented approach.

Become a Ruby Developer

Module Overview
Ruby is a smart, functional, and object-oriented programming language that blends the best features of scripting power with user-friendly syntax. In this module, we’ll dive into OOP in Ruby with hands-on practice using interactive exercises and illustrations. We'll start by creating and managing Ruby objects. Next, we’ll explore Ruby methods and blocks, essential tools in Ruby programming. Finally, we'll delve into Ruby classes and how they are used to implement OOP principles.

Ruby OOP (Object-Oriented Programming)

## Predicate methods

If we look at the list of methods defined for a `String` object, we see that there are methods that end with a question mark (`?`). 


In Ruby convention, these methods return either `true` or `false`. For example, we can ask a number if it’s even or odd:






This makes them read like a question, which is pretty cool.

We can also ask the number if it’s between two other numbers. This method needs us to pass those two other numbers. So, we now also have an example of a method that takes two arguments:





# Predicate methods

If we look at the list of methods defined for a `String` object, we see that there are methods that end with a question mark (`?`). 


In Ruby convention, these methods return either `true` or `false`. For example, we can ask a number if it’s even or odd:






Learn about the predicate methods in Ruby and how to use them.

Objects

Blocks

Conditionals

Writing Classes

Mini project 1

Conclusion

Predicate Methods

Predicate methods