This content was released on Nov 27 2018. The official support period is 6-months from this date.
Even though the app you've made in this course is small, you've written quite a bit of math-heavy code. simd can make that easier on you in the future!
This is a companion discussion topic for the original entry at https://www.kodeco.com/9225-gesture-recognizers-in-ios/lessons/8