Intro to Classes checkpoint

_notes

1. An instance of the Person class can do things like eat and sleep using instance methods, but it can also have attributes. For example, an instance of the Person class might have a name. The name of a person would therefore be an attribute of a Person instance.
2. Also, unlike local variables, instance variables start with a @. By making **@full_name an instance variable, we allow it to be used outside of the method where it's declared**.  This is an important concept, and also known as a variable's scope. If we didn't make @full_name an instance variable, it would not be accessible outside of the method where it's declared!!!!  HUGE!!! REPEAT THIS OVER AND OVER - GET IT INTO YOUR HEAD!!!!

3. Getter and setter methods are so common that Ruby provides a shortcut to create them. The attr_accessor method creates a getter and setter method based on an argument. You call the attr_accessor with a Symbol argument:

class Square
  attr_accessor :size
end

s = Square.new
s.size = 10   # This is the setter
s.size        #=> 10 # This is the getter 

_output

```Block output - basics
```
 Book description should return title and author in description
 
 ```Block output - getters and setters
```

 Book instance variables should be able get and set the title to 'LOTR'
 Book instance variables should be able to set the title to 'Hitchhicker's Guide'

 ```Block output - attribute accessor
```

 Playlist instance variables should be able to create a country playlist
 Playlist instance variables should be able to create a Rock playlist

_questions

1. Are classes "Camel Case" or "Pascal Case"?  
2. In Ruby - how do you distinguish between calling a property vs. a method?

Intro to Classes checkpoint

# Basics

class Book
  def title_and_author(title, author)
    # set title to instance variable
    # set author to instance variable
    @title = title
    @author = author
  end
  
  def description    
    # return a string with both instance variables
    # "Title was written by author
    "#{@title} was written by #{@author}"
  end
end

#Getters and Setters

class Book
  #setters
  def title=(t)
    @title = t
  end
  
  def author=(a)
    @author = a
  end
  
  def pages=(p)
    @pages = p
  end
  
  #getters
  def title
    @title
  end
  
  def author
    @author
  end
  
  def pages
    @pages
  end
end

# Attr Accessor

class Playlist
  attr_accessor :name
  attr_accessor :author
  attr_accessor :song_list
end