In this piece
This final demonstration lesson closes the reading-list exercise. A useful experiment ends with a checkable observation and a next step, even when the result is small.
Check the edges
Change the first article to exactly ten minutes: it should still appear. Set read to true: it should disappear. Make every article longer than ten minutes: the result should be an empty list.
Read the result
An empty list is a valid result. It means no article matches the question. A reading interface could explain that plainly and offer a longer time limit, rather than showing a blank space.
Choose the next question
Would you rather sort the matches by time or choose one at random? Pick one change and explain how you would know it works. Return to the previous lesson to try your variation.
END OF LESSON