error value update is not a member of scala collection immutable Map String Int

Question

 Trying to update value of an immutable Map, Scala outputs an error. On the other hand, any changes made in value of any key in case of mutable Maps is accepted. How?

Updating immutable Map:

// Scala map program of 

// Updating the values

// in immutable map

  

// Creating an object

object GFG

{

    // Main method

    def main(args:Array[String])

    {

  

        val mapIm = Map("Ajay" -> 30, 

                        "Bhavesh" -> 20, 

                        "Charlie" -> 50)

              

        println(mapIm)

          

        //Updating

        mapIm("Ajay") = 10 

  

        println(mapIm)

  

    }

}

Output:

error: value update is not a member of scala.collection.immutable.Map[String, Int]

Any help will be great.

Answer 1

Yes, If you try to update the value of an immutable Map, Scala outputs an error. On the other hand, any changes made in the value of any key in the case of mutable Maps are accepted.

Updating mutable Map:

// Scala map program of // Updating the values // in mutable map // Creating Object object GFG { // Main method def main(args:Array[String]) { val mapMut = scala.collection.mutable.Map("Ajay" -> 30, "Bhavesh" -> 20, "Charlie" -> 50) println("Before Updating: " + mapMut) // Updating mapMut("Ajay") = 10 println("After Updating: " + mapMut) } }

Output:

Before Updating: Map(Ajay -> 30, Charlie -> 50, Bhavesh -> 20)
After Updating: Map(Ajay -> 10, Charlie -> 50, Bhavesh -> 20)

Hope this helps!

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Thanks!!