How to check null in Scala?

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val maybeNull: String = "Hello, World!" // or null
val optionValue: Option[String] = Option(maybeNull)
optionValue match {
  case Some(value) => println("Value is not null: " + value)
  case None => println("Value is null")
}

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val maybeNull: String = "Hello, World!" // or null
if (maybeNull == null) {
  println("Value is null")
} else {
  println("Value is not null: " + maybeNull)
}

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val maybeNull: String = "Hello, World!" // or null
maybeNull match {
  case null => println("Value is null")
  case _ => println("Value is not null: " + maybeNull)
}

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object HelloWorld {
    def main(args: Array[String]) {
        val var1 = null
        if (Option(var1).getOrElse("").isEmpty) {
            println("variable is null")
        }
        // Output: variable is null
    }
}