How to declare a Empty Scala Map

Question

Can anyone explain how to declare a Empty Scala Map in Scala? Can anyone provide a simple example to this?

Answer 1

Hi,

• You can either declare an empty Scala map or one with values. Here is an example:

scala> var m:Map[String,Int]=Map()

m: Map[String,Int] = Map()

Here, you must include the type annotation so it can assign proper types to the variables.

• Declaring a Scala Map with values

When you provide values, Scala will use those to infer the type of variables. So, we don’t need to include the type annotations.

Here is an example:

scala> var m=Map("Niti"->0,"Giti"->1)

m: scala.collection.immutable.Map[String,Int] = Map(Niti -> 0, Giti -> 1)

Now to add key-value pair you need to follow this:

scala> m+=("Ruchi"->2)

scala> m

res1: scala.collection.immutable.Map[String,Int] = Map(Niti -> 0, Giti -> 1, Ruchi -> 2)

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