Execute Ruby Online

=begin
def triple_sequence(start, length)
	result = [start]
    n = 0
	while n < length - 1
      result << result [n] * 3
      n += 1
    end
  	return result
end
=end

def fibonacci(length)
	n = 0
  	result = [1, 1]
  if length == 0
  	return []
  elsif length == 1
    return [1]
  end
    	while  result.length < length 
          last = result[-1]
          sec_last = result[-2]
      	result <<	last + sec_last
   		end
  result.shift
  return result
end

print triple_sequence(2, 4) # => [2, 6, 18, 54]
puts
print triple_sequence(4, 5) # => [4, 12, 36, 108, 324]
puts