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Value = 1
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Convert to String:
You can use Tuple.toString() method to concatenate all the elements of the tuple into a string. Following is the
example to show the usage:
object Test {
def main(args: Array[String]) {
val t = new Tuple3(1, "hello", Console)
}
}
println("Concatenated String: " + t.toString() )
When the above code is compiled and executed, it produces the following result:
C:/>scalac Test.scala
C:/>scala Test
Concatenated String: (1,hello,scala.Console$@281acd47)
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Swap the Elements:
You can use Tuple.swap method to swap the elements of a Tuple2. Following is the example to show the usage:
object Test {
def main(args: Array[String]) {
val t = new Tuple2("Scala", "hello")
}
}
println("Swapped Tuple: " + t.swap )
When the above code is compiled and executed, it produces the following result:
C:/>scalac Test.scala
C:/>scala Test
Swapped tuple: (hello,Scala)
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Scala Options
Scala Option[T] is a container for zero or one element of a given type. An Option[T] can be
eitherSome[T] or None object, which represents a missing value. For instance, the get method of Scala's Map
produces Some(value) if a value corresponding to a given key has been found, or None if the given key is not
defined in the Map. The Option type is used frequently in Scala programs and you can compare this to null value
available in Java which indicate no value. For example, the get method of java.util.HashMap returns either a value
stored in the HashMap, or null if no value was found.
Let's say we have a method that retrieves a record from the database based on a primary key:
def findPerson(key: Int): Option[Person]
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