Scala ListMap

by Online Tutorials Library July 14, 2022

Scala ListMap

This class implements immutable maps by using a list-based data structure. It maintains insertion order and returns ListMap. This collection is suitable for small elements.

You can create empty ListMap either by calling its constructor or using ListMap.empty method.

Scala ListMap Example

In this example, we have created an empty ListMap and non-empty ListMap as well.

  import scala.collection.immutable._  object MainObject{      def main(args:Array[String]){          var listMap = ListMap(“Rice”->”100″,”Wheat”->”50″,”Gram”->”500″)    // Creating listmap with elements          var emptyListMap = new ListMap()            // Creating an empty list map          var emptyListMap2 = ListMap.empty           // Creating an empty list map          println(listMap)          println(emptyListMap)          println(emptyListMap2)      }  }  

Output:

ListMap(Rice -> 100, Wheat -> 50, Gram -> 500)  ListMap()  ListMap()

Scala ListMap Example: Applying Basic Operations

  import scala.collection.immutable._  object MainObject{      def main(args:Array[String]){          var listMap = ListMap(“Rice”->”100″,”Wheat”->”50″,”Gram”->”500″)    // Creating listmap with elements          listMap.foreach{              case(key,value)=>println(key+”->”+value)          }          println(listMap(“Gram”))          var newListMap = listMap+(“Pulses”->”550″)          newListMap.foreach {              case (key, value) => println (key + ” -> ” + value)          }         }  }  

Output:

Rice->100  Wheat->50  Gram->500  500  Rice -> 100  Wheat -> 50  Gram -> 500  Pulses -> 550

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Scala ListMap

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