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Chapter 13. Collections > Mutable and Immutable Collections
13.2. Mutable and Immutable Collections
Scala supports both mutable and immutable collections. An immutable collection can never change, so you can safely share a reference to it, even in a multithreaded program. For example, there is a scala.collection.mutable.Map and a scala.collection.immutable.Map. Both have a common supertype scala.collection.Map (which, of course, contains no mutation operations).
Note
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| When you have a reference to a scala.collection.immutable.Map, you know that nobody can change the map. If you have a scala.collection.Map, then you can’t change it, but someone else might. |
