I always use the first lightbot as an introduction to functions. The best part is when one student figures out the concept I encourage the class to 'cheat' from each other. I have them show each other the concept of functions. Its great fun to explain to the class that not only are they learning core computer science concepts but also that it is OK to build on others ideas and work together. Concepts that the schools to their best to knock out of our children for the sake of independent evaluation.
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