Mutable collections

Mutable collections are used when you need collections that can be updated or extended in place, usually for better performance. After the computations are done, you can transform it to its immutable counterpart. Scala provides several mutable collection classes, including ArrayBuffer, ListBuffer, HashSet, and HashMap. Resources

Visit the following resources to learn more:

• @official@Concrete Mutable Collection Classes | Collections (Scala 2.8 - 2.12) | Scala Documentation
• @official@Concrete Mutable Collection Classes | Collections | Scala Documentation
• @article@Scala mutable collections on waitingforcode.com - articles about Scala collections