Type `square(10)` on the last line. Notice it doesn't give you the correct value. Fix the square function to correctly return `n*n`. Everything updates instan

Type `square(10)` on the last line. Notice it doesn't give you the correct value. Fix the square function to correctly return `n*n`. Everything updates instantly. There's your answer. It's actually really neat to code that way, especially with a long chain of logic.