Scala map contains() method with example
The contains() method of Scala is equivalent to the isDefinedAt method of Scala but the only difference is that isDefinedAt is observed on all the PartialFunction classes while contains is clearly defined to the Map interface of Scala. It checks whether the stated map contains a binding for a key or not.
-
Method Definition:
def contains(key: K): Boolean
Where, k is the key.
-
Return Type:
It returns true if there is a binding for the key in the map stated else returns false.
Example :
// Scala program of contains() // method // Creating object object GfG { // Main method def main(args : Array[String]) { // Creating a map val map : Map[Int,Int] = Map( 2 - > 3 ) // Applying contains method val result = map.contains( 2 ) // Displays output println(result) } } |
Output:
true
Here, contains method has a key identical to the key present in the map stated above so, it returns true.
Example :
// Scala program of contains() // method // Creating object object GfG { // Main method def main(args : Array[String]) { // Creating a map val map : Map[Int,Int] = Map( 4 - > 7 ) // Applying contains method val result = map.contains( 5 ) // Displays output println(result) } } |
Output:
false
Here, contains method has a key which is not identical to the key present in the map stated above so, it returns false.