In Ruby, object methods are public by default, while data is private. To access #key# data: instance variables #key#, we use the accessor method, `attr_reader`.

# Usage

Suppose you want to read the instance variables of an object. Normally, you would define `getter` methods to access the variables:
```ruby
class Person
  def name
    @name
  end
end
```
This is a very common pattern, so Ruby has the accessor method `attr_reader`. The above code can be condensed to:
```ruby
class Person
  attr_reader :name
end
```
Writing it this way is not only idiomatic; it's also has a slight performance advantage.

# Code

Let’s make a class (`Person`) with a variable (`name`). Using `attr_reader`, you can read the variable name outside the class scope.


class Person
  attr_reader :name

  def initialize(name)
   @name = name
  end
end

person = Person.new("Educative")
puts person.name          # Read variable

What is attr_reader in Ruby?

Use `attr_reader` in Ruby for concise, performant, idiomatic access to instance variables.