Scala Maps

by Online Tutorials Library July 14, 2022

Scala Maps

Map is used to store elements. It stores elements in pairs of key and values. In scala, you can create map by using two ways either by using comma separated pairs or by using rocket operator.

Scala maps Example

In the following example, we have both approaches to create map.

  object MainObject{      def main(args:Array[String]){          var map = Map((“A”,”Apple”),(“B”,”Ball”))          var map2 = Map(“A”->”Aple”,”B”->”Ball”)          var emptyMap:Map[String,String] = Map.empty[String,String]           println(map)          println(map2)          println(“Empty Map: “+emptyMap)      }  }  

Output:

Map(A -> Apple, B -> Ball)  Map(A -> Aple, B -> Ball)  Empty Map: Map()

Scala Map Example: Adding and Removing Elements

You can add and remove new elements in maps. Scala provides you lots of predefined method. You can use them to perform operations on the Maps. In the following example, we have created a new Map.

  object MainObject{      def main(args:Array[String]){          var map = Map(“A”->”Apple”,”B”->”Ball”)             // Creating map          println(map(“A”))               // Accessing value by using key          var newMap = map+(“C”->”Cat”)         // Adding a new element to map          println(newMap)          var removeElement = newMap – (“B”)       // Removing an element from map          println(removeElement)      }  }  

Output:

Apple  Map(A -> Apple, B -> Ball, C -> Cat)  Map(A -> Apple, C -> Cat)

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Scala maps Example

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