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}
}
When the above code is compiled and executed, it produces the following result:
C:/>scalac Test.scala
C:/>scala Test
a.getOrElse(0): 5
b.getOrElse(10): 10
C:/>
Using isEmpty() Method:
Following is the example of showing how to use isEmpty() to check if the option is None or not:
object Test {
def main(args: Array[String]) {
val a:Option[Int] = Some(5)
val b:Option[Int] = None
}
}
println("a.isEmpty: " + a.isEmpty )
println("b.isEmpty: " + b.isEmpty )
When the above code is compiled and executed, it produces the following result:
C:/>scalac Test.scala
C:/>scala Test
a.isEmpty: false
b.isEmpty: true
C:/>
Scala Option Methods:
Following are the important methods which you can use while playing with Options. For a complete list of methods
available, please check official documentation of Scala.
SN Methods with Description
1
2
3
4
5
def get: A
Returns the option's value.
def isEmpty: Boolean
Returns true if the option is None, false otherwise.
def productArity: Int
The size of this product. For a product A(x_1, ..., x_k), returns k
def productElement(n: Int): Any
The nth element of this product, 0-based. In other words, for a product A(x_1, ..., x_k), returns x_(n+1) where 0 < n <
k.
def exists(p: (A) => Boolean): Boolean
Returns true if this option is nonempty and the predicate p returns true when applied to this Option's value.
Otherwise, returns false.
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