StringBuilder in Scala

A String object is immutable, i.e. a String cannot be changed once created. In situations where you need to perform repeated modifications to a string, we need StringBuilder class. StringBuilder is utilized to append input data to the internal buffer. We can perform numerous operations with the support of methods on the StringBuilder. This operation comprises appending data, inserting data, and removing data.
important points:

• The StringBuilder class is beneficent for mutable strings to extend effectively.
• The instance of StringBuilder is utilized like a String.
• Strings of Scala are immutable so, when you require a mutable String then you can use StringBuilder.

Operations performed by the StringBuilder class

• Appending character: This operation is helpful in appending character.
  Example:

  // Scala program to append
  // a character
  
  // Creating object
  object GFG
  {
  
      // Main method
      def main(args: Array[String])
      {
  
          // Creating StringBuilder
          val x = new StringBuilder("Author");
  
          // Appending character
          val y = (x += 's')
  
          // Displays the string after
          // appending the character
          println(y)
      }
  }
  Output:
  
  

  Authors
  

  Here, (x += ‘ ‘) is utilized to append a character.

• Appending String: This operation is helpful in appending string.
  Example:

  // Scala program to append
  // a String
  
  // Creating object
  object GFG
  {
  
      // Main method
      def main(args: Array[String])
      {
  
          // Creating StringBuilder
          val x = new StringBuilder("Authors");
  
          // Appending String
          val y = (x ++= " of GeeksforGeeks")
  
          // Displays the string after
          // appending the string
          println(y)
  
      }
  }
  Output:

  Authors of GeeksforGeeks
  

  Here, (x ++= ‘ ‘) is utilized to append String.

• Appending String representation of number: Here, the number can be of any type like Integer, Double, Long, Float, etc.
  Example:

  // Scala program to append
  // String representation
  // of number
  
  // Creating object
  object num
  {
  
      // Main method
      def main(args: Array[String])
      {
  
          // Creating StringBuilder
          val x = new StringBuilder("Number of Contributors : ");
  
          // Appending String
          // representation of number
          val y = x.append(800)
  
          // Displays the string after
          // appending the number
          println(y)
      }
  }
  Output:
  
  

  Number of Contributors : 800
  

  Here, x.append(n) is utilized to append the String representation of the number, where ‘n’ is the number of any type.

• Resetting the content of the StringBuilder: It is helpful in resetting the content by making it empty.
  Example:

  // Scala program to reset
  // the content
  
  // Creating object
  object GFG
  {
  
      // Main method
      def main(args: Array[String])
      {
  
          // Creating StringBuilder
          val x = new StringBuilder("Hello")
  
          // Resetting the content
          val y = x.clear()
  
          // Displays empty content
          println(y)
      }
  }
  Output:

  ()
  

  Here, x.clear() is utilized to clear the content of the StringBuilder.

• Delete operation: This operation is helpful in deleting characters from the content of the StringBuilder.
  Example:

  // Scala program to perform
  // delete operation
  
  // Creating object
  object delete
  {
  
      // Main method
      def main(args: Array[String])
      {
  
          // Creating StringBuilder
          val q = new StringBuilder("Computer Science")
  
          // Deleting characters
          val r = q.delete(1, 3)
  
          // Displaying string after
          // deleting some characters
          println(r)
      }
  }
  Output:

  Cputer Science
  

  Here, q.delete(i, j) is utilized to delete the character indexed from i to (j – 1).

• Insertion operation: This operation is helpful in inserting Strings.
  Example:

  // Scala program to perform
  // insertion operation
  
  // Creating object
  object insert
  {
  
      // Main method
      def main(args: Array[String])
      {
  
          // Creating StringBuilder
          val q = new StringBuilder("GfG CS portal")
  
          // inserting strings
          val r = q.insert(4, "is a " )
  
          // Displays string after
          // insertion of required
          // string
          println(r)
      }
  }
  Output:

  GfG is a CS portal
  

  Here, q.insert(i, “s”) is utilized to insert the String (s) at index i.

• Converting StringBuilder to a String: StringBuilder can be converted to a String using this operation.
  Example:

  // Scala program of Converting
  // StringBuilder to a String
  
  // Creating object
  object builder
  {
  
      // Main method
      def main(args: Array[String])
      {
  
          // Creating StringBuilder
          val q = new StringBuilder("GeeksforGeeks")
  
          // Applying conversion
          // operation
          val r = q.toString
  
          // Displays String
          println(r)
      }
  }
  Output:

  GeeksforGeeks
  

  Here, q.toString is utilized to convert StringBuilder to a string.