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

Next TopicScala Tuples

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