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Scala Methods to Call Options

By IncludeHelp Last updated : October 28, 2024

Option in Scala is used when the method's return type is not fixed. It might be a value or it can be a NULL object in Scala. In Scala, it can be referred to as a carrier object that can contain single or no elements.

In the Scala programming language, there can be a few methods that can be used to call the Scala option.

The get Method

The get method in Scala returns an Option's value. This method does not return a NULL value and returns an Error instead.

Example

object myObject {
  def main(args: Array[String]): Unit = {
    val opt: Option[String] = Some("Includehelp")
    val value = opt.get
    println(value)
  }
}

Output

Includehelp

The productArity Method

The productArity method returns an integer value which is the size of the option's value.

Example

object myObject {
  def main(args: Array[String]): Unit = {
    val opt: Option[String] = Some("Includehelp")
    val value = opt.productArity
    println(value)
  }
}

Output

1

The productElement(n:Int) Method

The productElement() method in Scala is used to return the n^th element of a product which is 0-indexed.

Example

object myObject {
  def main(args: Array[String]): Unit = {
    val opt: Option[Int] = Some(76)
    val value = if (opt.isDefined) opt.productElement(0) else "No value"
    println(value)
  }
}

Output

76

The exists Method

The exists method of Scala programming language is used to check if the option value satisfies a given condition or not. And returns a boolean value based on it.

Example

object myObject {
  def main(args: Array[String]): Unit = {
    val opt: Option[Int] = Some(76)
    val value = opt.exists(x => x % 2 == 0)
    
    if (value) {
      println("Value is even")
    } else {
      println("Value is odd")
    }
  }
}

Output

Value is even

The filter() Method

The filter() method in Scala is used to return the value of Option. This value is returned only when the stated condition is satisfied.

Example

object myObject {
  def main(args: Array[String]): Unit = {
    val opt: Option[Int] = Some(76)
    val value = opt.filter(x => x % 2 == 0)
    println(value)
  }
}

Output

Some(76)

The filterNot() Method

Just opposite of the filter() method, the filterNot() method returns the value of the option but only when the condition is not satisfied.

Example

object myObject {
  def main(args: Array[String]): Unit = {
    val opt: Option[Int] = Some(7)
    val value = opt.filterNot(x => x % 2 != 0) // Filters out odd numbers
    println(value)
  }
}

Output

None

The isDefined Method

The isDefined method in Scala is used to return boolean value based on the instance of option i.e. true if some value is present and false when none is present.

Example

object myObject { 
  def main(args: Array[String]): Unit = { 
    val opt: Option[Int] = Some(7) 
    val value = opt.isDefined 
    println(value)
  } 
}

Output

true