Pseudo Code Ruby

test.rb

class Test
	def selectNode(shoeSize)
		# Let's assume the cells is on a web page. And we are using
		# selenium to parse the boxes.
		# Here are some boilerplate code I found
		driver = Selenium::WebDriver.for :firefox
		driver.navigate.to "http://127.0.0.1/boxes"

		# http://seleniumhq.github.io/selenium/docs/api/rb/Selenium/WebDriver/SearchContext.html#find_elements-instance_method
		boxElements = driver.find_elements(:id,"boxes")

		# Lets iterate the boxes. Let's use this nifty each_with_index because we can assume the index represents the position of the box.
		# https://ruby-doc.org/core-2.5.1/Enumerable.html#method-i-each_with_index
		# Let's create a map too for a simple mapping of the value since the boxElements are not aware of the text inside.
		shoeSizeMap = Hash.new

		boxElements.each_with_index do |box, index|
			# Let's assume the element is dead simple. It's just a text inside
			# http://seleniumhq.github.io/selenium/docs/api/rb/Selenium/WebDriver/Element.html#text-instance_method
			shoeSizeMap[box.text] = index
		end

		# The setup with mapping is complete. Ideally this should be done in setUp.
		# Let's actually do the test.
		return shoeSizeMap[shoeSize]
	end
end