gistfile1.rb

def title_case(title, options = {})
  return title if title.empty?

  head, *tail = title.split(' ')
  
  head.capitalize! << ' ' << tail.collect { |x| options[:minors] && options[:minors].downcase.split(' ').include?(x) ? x : x.capitalize! }.join(' ')
  
end

=====================
TESTS

Test.expect(title_case('the quick brown fox') == 'The Quick Brown Fox')

Test.expect(title_case('a clash of KINGS', minors: 'a an the OF') == 'A Clash of Kings')

Test.expect(title_case('') == '')

If fact I might have overreacted with hash as optional parameter, so I've rewrote it:

def title_case(title, options = '')
return title if title.empty?

head, *tail = title.split(' ')

head.capitalize! << ' ' << tail.collect { |x| !options.empty? && options.downcase.split(' ').include?(x.downcase) ? x : x.capitalize! }.join(' ')

end

Tests are still passing but I get the same error when trying to submit