Scala program to reverse a string

1. Introduction

Reversing a string is one of the fundamental operations in string manipulation. It's a common interview question and a foundation for many algorithms. In this blog post, we'll explore a simple Scala program that reverses a given string.

2. Program Steps

1. Set up the Scala environment.

2. Create an object to house the main function.

3. Within the main function, define a string.

4. Use Scala's built-in methods to reverse the string.

5. Print the reversed string.

6. Run the program.

3. Code Program

object StringReversalApp {
  def main(args: Array[String]): Unit = {
    val originalString = "ScalaProgramming"  // string to be reversed
    // Reverse the string
    val reversedString = originalString.reverse

    println(s"Original String: $originalString")
    println(s"Reversed String: $reversedString")
  }
}

Output:

Original String: ScalaProgramming
Reversed String: gnimmargorPalaSc

Explanation:

1. The program starts with an object named StringReversalApp. In Scala, the main method, which serves as the program's entry point, resides inside an object.

2. We define a string originalString that we intend to reverse.

3. Scala's String class provides a built-in method named reverse that can reverse a string effortlessly. We use this method to obtain the reversed string, which we store in the variable reversedString.

4. The program then prints both the original and reversed strings for comparison.

5. When the program is executed, it provides the original and reversed strings as output.