More about open classes

my_string.rb

class String
  def to_camel_case
    return self if self == ""
    words = self.split
    words[1..words.size].each { |word| word.capitalize! }
    words.join('')
  end

  def to_snake_case
    self.downcase.gsub(/\s/, '_')
  end
end

puts "run this method".to_camel_case
puts "run this method".to_snake_case