In this chapter, you learned about persistent change methods of Immutable.js collections. Each of these methods returns a new instance of the collection, but it retains any parts of the data that didn't actually change for efficiency purposes.
The types of persistent change methods include insertion, updates, removal, and emptying of entire collections. You saw how these methods can be chained together to handle more than one action at a time. Lastly, we took an in-depth look at managing the change history of collections and how immutability can contribute to the solution.
In the next chapter, we'll look at filtering collections.