This is the ninth episode of the tech podcast ‘Grumpy old Coders’. David started to work a bit with Kotlin. So Thomas and David take a look at two of David’s toy projects which kicks off a vital discussion about coding with Kotlin and should give you a good first impression about this programming language. We are referring to some source code examples in this episode. They can be found under 'https://github.com/nosqlgeek/kEventLib' and 'https://github.com/nosqlgeek/kRTree'.