Closures isn’t a simple topic. Trying to assist others with understanding this topic I chose to create a short video clip. I will be very glad to get feedback and suggestions. The video clip was developed as part of the Scala Fundamentals course. You can find this course available for free personal and academic usage at www.abelski.com.
The Visitor Design Pattern
The visitor design pattern allows us to add operations to objects that already exist without modifying their classes and without extending them.