ruthy.rb

def validCoords?(coord_strings)
	coords = parseCoords(coords) # take ["a1", "b3"] => [["b", 3], ["a", 1]]

	if coords.length == 0
		return false

	start_a = coords[0][0]
	start_b = coords[0][1]

	if increasingNumbers?(coords[0], coords[1])
		# for each coord make sure number is increasing
		return eachNumberIncreasingBy1?(coords)

	return eachLetterIncreasingBy1?(coords)
	

def eachNumberIncreasingBy1?(coords)
	last = nil
	result = true
	coords.each do |coord|
		if last == nil
			return

		number = coord[1]
		if last + 1 != number
			result = false
			break
	end

	return result
end

def eachLetterIncreasingBy1?(coords)
	last = nil
	result = true
	coords.each do |coord|
		if last == nil
			return

		letter = coord[0].ord 
		if last + 1 != letter
			result = false
			break
	end

	return result
end