Practice Time: Pairs

Practice Time

Let's go through an example of getting information about a book in the format of a Pair. Generally, you want information about both the title and the author, and perhaps also the year.

1. Let’s create a basic book class, with a title, author, and year. Of course, you could get each of the properties separately.
2. Create a method that returns both the title and the author as a Pair.
3. Create a method that returns the title, author and year as a Triple. Use the documentation to find out how to use Triple.
4. Create a book instance.
5. Print out the information about the book in a sentence, such as: “Here is your book X written by Y in Z.”

// TODO 1: Let’s create a basic book class, with a title, author, and year. Of course,
//  you could get each of the properties separately.
class Book(val title: String, val author: String, val year: Int) {

    // TODO 2: Create a method that returns both the title and the author as a Pair.
    fun getTitleAuthor(): Pair<String, String> = (title to author)

    // TODO 3: Create a method that returns the title, author and year as a Triple.
    fun getTitleAuthorYear(): Triple<String, String, Int> = Triple(title, author, year)

}

// File:            Main.kt
// Programmer:      Engineer Nolverto Urias Obeso
// Creation Date:   06/21/2023
// Email:           nolvertou@gmail.com
// Description:     Using pairs
// Activity:        Let's go through an example of getting information about a book in the
//                  format of a Pair. Generally, you want information about both the title 
//                  and the author, and perhaps also the year.

fun main() {
    // TODO 3: Create a book instance.
    val book = Book("Physics", "Nolverto", 2030)
    println(book.getTitleAuthor())              // Output: (Physics, Nolverto)
    println(book.getTitleAuthor().first)        // Output: Physics
    println(book.getTitleAuthor().second)       // Output: Nolverto

    println(book.getTitleAuthorYear())          // Output: (Physics, Nolverto, 2030)
    println(book.getTitleAuthorYear().first)    // Output: Physics
    println(book.getTitleAuthorYear().second)   // Output: Nolverto
    println(book.getTitleAuthorYear().third)    // Output: 2030

    // TODO 4: Print out the information about the book in a sentence, such as: 
    //  “Here is your book X written by Y in Z.”
    println("Here is your book ${book.getTitleAuthorYear().first}  " +
            "written by ${book.getTitleAuthorYear().second} " +
            "in ${book.getTitleAuthorYear().third}.") 
    
    // Output: Here is your book Physics  written by Nolverto in 2030.

}