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)

## Setting attribute information

Imagine that a person not only needs a name but also a password. However, let’s also imagine that, at the time of the creation of a new `person` instance, this password is not yet known.

Instead, we want to be able to tell the `person` object about its email password later.

We can do this like so:

class Person
  def initialize(name)
    @name = name
  end

  def name
    @name
  end

  def password=(password)
    @password = password
  end
end

As we can see, the `password=` method does nothing else but take a single argument (called `password`) and assign the value of this local variable to the `@password` instance variable.

## Attribute writers called on an object

This method’s structure looks exactly the same as the structure of the `initialize` method. This is true, except that `initialize` is called behind the scenes whenever we call `new` on the class. Our new `password=` method needs to be explicitly called on the object itself once it’s been created.
Again, because this kind of method is used so often, there’s another name for it: it’s an **attribute writer**.

Now, we can use the attribute writer as shown:

# Setting attribute information

Imagine that a person not only needs a name but also a password. However, let’s also imagine that, at the time of the creation of a new `person` instance, this password is not yet known.

Instead, we want to be able to tell the `person` object about its email password later.

We can do this like so:

As we can see, the `password=` method does nothing else but take a single argument (called `password`) and assign the value of this local variable to the `@password` instance variable.

# Attribute writers called on an object

This method’s structure looks exactly the same as the structure of the `initialize` method. This is true, except that `initialize` is called behind the scenes whenever we call `new` on the class. Our new `password=` method needs to be explicitly called on the object itself once it’s been created.
Again, because this kind of method is used so often, there’s another name for it: it’s an **attribute writer**.

Now, we can use the attribute writer as shown:

Objects

Blocks

Conditionals

Writing Classes

Mini project 1

Conclusion

Attribute Writers

Setting attribute information