2.) Basic Kotlin Features

• typed nullability

• smart casting (and mutable vars gotcha)

• lateinit vars

• properties, backing fields (set(value) { field = value ... }, difference between val x = "" and val x: String get() = ""

• string interpolation and """multiline escaped ${strings}"""

• data classes

• null safety operators: safe-call (?.) and elvis (?:)

• when keyword (and complex conditions, such as ranges)

• control statement as expression (assignment of when, return, ...)

• generics (<T: Blah>, in/out, and star projection <*>)