Scala and Spark for Big Data Analytics

Mutable and immutable

In Scala, you will find mutable and immutable collections. A collection can have a mutable implementation and an immutable implementation. That's the reason why, in Java, a List can't be both a LinkedList and an ArrayList, but List has a LinkedList implementation and an ArrayList implementation. The following figure shows all collections in the package scala.collection.immutable:

Figure 2: All collections in package scala.collection.immutable

Scala imports the immutable collections by default, and if you need to use a mutable one, then you need to import it yourself. Now to get a brief overview of all collections in package ...