3 Days of Swift vs. 100 Days of Swift: Which Is Better for a Beginner? Overview:   Both 3 Days of Swift  and 100 Days of Swift  are learning programs aimed at teaching Swift to beginners, but they differ greatly in format, duration, and delivery. 3 Days of Swift is a short, intensive bootcamp-style course (with subscription access) that emphasises video-based pair programming in Xcode over a few days. In contrast, 100 Days of Swift is a free 100-day challenge that guides lear