challenge5

🧠 Challenge #5

Challenge done during Section 7: Lambda Expressions, Collections and Generics.

🎯 Tasks

1. Make the following code compile:

   fun main() {
    val joe = Person("Joe", "Jones", 45)
    val (fName, lName, age) = joe
    println("fName = $fName, lName = $lName, age = $age")
   }
   
   class Person(val firstName: String, val lastName: String, val age: Int)

2. Using the following data, create an ImmutableMap. Each Person entry should have its last name as key.

   val joe = Person("Joe", "Jones", 45)
   val jane = Person("Jane", "Smith", 12)
   val mary = Person("Mary", "Wilson", 70)
   val john = Person("John", "Adams", 32)
   val jean = Person("Jean", "Smithson", 66)

3. Without using an explicit loop, print out how many people have last names beginning with the letter "S".
4. Without using an explicit loop and using the created Map, create and print a list of Pairs. The first item in the pair should be the first name and the last item in the pair should be the last name.
5. Using the also function and the people Map, print out each Person's name and age, like in the following examples:

   Joe is 45 years old.
   Jane is 12 years old.
   

6. Without using an explicit loop, create a list3 which contains only elements present in both list1 and list2.

   val list1 = listOf(1, 4, 9, 15, 33)
   val list2 = listOf(4, 55, -83, 15, 22, 101)

7. Do whatever you need to do to make paper = regularPaper compile.

   val regularPaper = Box<Regular>()
   val paper = Box<Paper>()
   paper = regularPaper
   
   class Box<T>
   open class Paper
   class Regular : Paper()
   class Premium : Paper()