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class Book
  attr_accessor :title, :isbn, :author, :price

  def initialize(title, isbn, author, price)
    @title = title
    @isbn = isbn
    @author = author
    @price = price
  end
end

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class Book
attr_accessor :title, :isbn, :author, :price
 
  def initialize(title, isbn, author, price)
 @title = title
@isbn = isbn
   @author = author
@price = price
end
   end

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class Book
  # A comment
end

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class FictionBook # camel case for class names
  #...
end

def days_since_launch # snakes everywhere else
  #...
end

STANDARD_PRICE = 10 # uppercase camel case for constants

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# Parentheses are optional but usually preferred when defining or calling methods with parameters

def find_book(isbn) 
  # ...
end

find_book('978-0321584106')

# Parentheses are left off when methods have no parameters

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["John", "Mark", "Luke"].each { |name| puts name }

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["John", "Mark", "Luke"].each do |name| 
  puts "What's their name?"
  puts "I think it's #{name}."
end

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if i < 0
  puts "#{i} is a negative number"
elsif i > 0
  puts "#{i} is a positive number"
else
  puts "The number is zero"
end

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# Instead of if not

if not @private
  puts "This product is available."
end

# use unless

unless @private
  puts "This product is available."

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i = 1

while i < 11
  puts i
  i += 1
end