He's pointing out that the order of statements in the source code doesn't necessary correspond to the order of evaluation. In this case even though the functio

He's pointing out that the order of statements in the source code doesn't necessary correspond to the order of evaluation. In this case even though the function call is the last statement in the source code, it's actually an argument to the multiplication, and the multiplication is the last operation being executed. That's non-obvious when just looking at the code, since the function call looks like it's last.