Scala function: Check if a string is a palindrome

Last update on February 06 2025 12:56:18 (UTC/GMT +8 hours)

Write a Scala function to check if a given string is a palindrome.

Before you start!

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

• What a palindrome is: A string that reads the same forward and backward.
• Scala string manipulation techniques.
• How to reverse a string in Scala.
• How to compare two strings for equality.

Try before looking at the solution!

Think about how you can check if a string is a palindrome:

• How can you reverse a string in Scala?
• Once reversed, how do you compare it with the original string?
• How would you handle case sensitivity or spaces in the string?
• Can you solve this problem using recursion or iteration instead of the built-in reverse method?

Sample Solution:

Scala Code:

object PalindromeChecker {
  def isPalindrome(str: String): Boolean = {
    val reversed = str.reverse
    str == reversed
  }

  def main(args: Array[String]): Unit = {
    val input1 = "madam"
    val isPalindrome1 = isPalindrome(input1)
    println(s"$input1 is a palindrome: $isPalindrome1")

    val input2 = "scala"
    val isPalindrome2 = isPalindrome(input2)
    println(s"$input2 is a palindrome: $isPalindrome2")
  }
}

Sample Output:

madam is a palindrome: true
scala is a palindrome: false

Scala Code Editor :

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