Answered: Suppose some written the following…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Suppose some written the following Kotlin function to test the comments length style:

fun commentValue(value: String) = when {

value.isEmpty() -> "Should not be empty"

value.length < 5 -> "Too short"
else -> "Correct"

}

fun main() {

println(commentValue("")) // Should not be empty

println(commentValue("ABC")) // Too short

println(commentValue("ABCDEF")) // Correct

}

You are asked to re-write the code to restrict commentValue to only two values (e.g. Empty or Correct)? What is the proper way to seal commentValue to only these two values.

Expert Solution

Step 1: Introduction

To restrict the commentValue function to return only two specific values, "Empty" or "Correct," you can use Kotlin's sealed classes and create a sealed hierarchy that enforces a limited set of possible return values. Here's how you can rewrite the code using sealed classes:

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