Ruby/Language Basics/require

%w{file1 file2 file3 file4 file5}.each { |l| require l }

//assume a.rb contains the following:
require "b"
//And b.rb contains the following:
require "c"
//And c.rb contains the following:
def example
  puts "Hello!"
end
//And d.rb contains the following:
require "a"

class String
  def vowels
    self.scan(/[aeiou]/i)
  end
end
# And put this code in a file called vowel_test.rb:
require "string_extensions"
puts "This is a test".vowels.join("-")

//Put this in a.rb:
puts "Hello from a.rb"
//And put this in a file called b.rb:
require "a"
puts "Hello from b.rb"
require "a"
puts "Hello again from b.rb"
//Run with ruby b.rb