Professional Scala

Other Collections

Now that we've covered the List and some relevant Traversables in the Scala standard library, we should also visit some other useful collections Scala provides. Even though this section has less theoretical material, this means that we'll have more time on the final activities of the chapter.

Sets

Sets are Iterables that contain no duplicate elements. The Set class provides methods to check for the inclusion of an element in the collection, as well as combining different collections. Note that since Set inherits from Traversable, you can apply all the higher-order functions we've seen previously on it. Due to the nature of its apply method, a Set can be seen as a function of type A => Boolean, which returns true if the element ...