Reflective functions and properties

Reflection doesn't stop with classes and objects. Most of the Kotlin system can be accessed, and that includes functions and properties. Let's start with a class that contains some member functions, an extension function for Double, and a couple of properties:

    class Rocket() { 
      var lat: Double = 0 
      var long: Double = 0 
 
      fun explode() { 
        println("Boom") 
      } 
 
      fun setCourse(lat: Double, long: Double) { 
        require(lat.isValid()) 
        require(long.isValid()) 
        this.lat = lat 
        this.long = long 
      } 
 
      fun Double.isValid() = Math.abs(this) <= 180 
    } 

The extension function is used to check that the Double parameter is a valid latitude or longitude whenever we invoke setCourse.

The next function is similar to the function for printing constructors from earlier, and prints out the names of each function defined in this class. The appropriately named property...