I spent many hours working on this article , along with the author and other editors on the Ray Wenderlich Android team. The article compares and contrasts the Swift and Kotlin programming languages. Even if your interest is only with Kotlin, there is still a ton of great information here. Please have a read and let me know what you think!
I provide mobile strategy & development for the Health & Fitness markets. Author of The Kotlin Book. Professor of Mobile Design & Development at Howard Community College, Columbia, Maryland. Photographer, Scientist, Cyclist, Martial Artist.