Nokosee’s Thinking
fun is-safe-bottom(y): y >= -30 end
fun is-safe-top(y): y <= 510 end
fun is-onscreen(y): is-safe-bottom(y) and is-safe-top(y) end
Sabra’s Thinking
fun is-safe-bottom(y): y > -40 end
fun is-safe-top(y): y < 520 end
fun is-onscreen(y): (y > -40) and (y < 520) end
1 Nokosee and Sabra have different strategies for keeping Sam on the screen. How does Nokosee’s strategy work?
2 How does Sabra’s strategy work?
3 What’s an advantage of Nokosee’s strategy?
4 What’s an advantage of Sabra’s strategy?
5 Which strategy do you prefer? Why?
These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, 1738598, 2031479, and 1501927). 
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