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Scala Programming: Exchange the first and last characters in a given string and return the new string

Scala Programming Basic Exercise-8 with Solution

Write a Scala program to exchange the first and last characters in a given string and return the new string.

Sample Solution:

Scala Code:

object scala_basic {
  def test(str1: String): String = 
    {
    val len = str1.length
    if (len <= 1) str1
    else str1.charAt(len - 1) + str1.substring(1, len - 1) + str1.charAt(0)
    }   
   def main(args: Array[String]): Unit = {
      println("Result: " + test("Scala"));
      println("Result: " + test("abcd"));
      println("Result: " + test("ab"));
      println("Result: " + test("a"));
    }
}

Sample Output:

Result: acalS
Result: dbca
Result: ba
Result: a

Scala Code Editor :

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Previous: Write a Scala program to remove the character in a given position of a given string. The given position will be in the range 0...string length -1 inclusive.
Next: Write a Scala program to create a new string which is 4 copies of the 2 front characters of a given string.If the given string length is less than 2 return the original string.

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