Scala function: Reverse a Given String

Last update on February 06 2025 12:56:19 (UTC/GMT +8 hours)

Write a Scala function to reverse a given string.

Before you start!

To solve this problem, you should have a basic understanding of:

• Scala strings and how they are represented.
• String manipulation methods in Scala.
• How to iterate over characters in a string.
• The built-in reverse method in Scala.

Try before looking at the solution!

Think about different ways to reverse a string:

• How can you access individual characters of a string?
• Is there a built-in method that can directly reverse a string?
• If you were to reverse a string manually, how would you do it?
• How can you use recursion or iteration to achieve the same result?

Try implementing a simple function to reverse a string before checking the solution!

Sample Solution:

Scala Code:

object StringReverser {
  def reverseString(str: String): String = {
    str.reverse
  }

  def main(args: Array[String]): Unit = {
    val input = "Scala, Code!"
    val reversed = reverseString(input)
    println(s"The reversed string of $input is: $reversed")
  }
}

Sample Output:

The reversed string of Scala, Code! is: !edoC ,alacS

Scala Code Editor :

Previous: Calculate the sum of digits in a number.
Next: Check if a string is a palindrome.