Visitor Design Pattern Is Giving Way To Pattern Matching Expressions!

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The Visitor is one of the most beautiful design patterns for its unique capability to extend a hierarchy of classes by a method that none of the hierarchy members have. Still, with the progression of functional concepts in the C# language syntax, the Visitor is also progressing - to oblivion.
This video will teach you the working principle behind the Visitor design pattern and demonstrate a traditional approach to implementing and consuming it, like the one you might find in the Gang of Four book.
But, as we said, the C# language is changing. It is progressing towards supporting more functional designs, and one aspect of that change is the increasing support for pattern matching, including type-test-and-set patterns. By coincidence, that is the ground of the Visitor, too!
By the end of this video, you will learn how to implement Visitor-like mappings using novel C# syntax that includes type-matching patterns, switch expressions, and even the good-old extension methods.
You will even see the possibility of implementing impromptu visitors using lambdas, an approach well outside the scope of traditional Visitors based on classes.
Watch this video and learn why the Visitor design pattern mostly remains confined within library code today, while pattern-matching expressions tend to take the Visitor's place in business applications.


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⚡️Chapters:
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⌚ 00:00 Intro
⌚ 00:48 Motivation for the Visitor pattern
⌚ 03:26 Implementing the Visitor
⌚ 08:38 Using type patterns to substitute a visitor
⌚ 13:31 Comparing the object-oriented and functional implementation
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👨 About Me 👨
Hi, I’m Zoran, I have more than 20 years of experience as a software developer, architect, team lead, and more. I have been programming in C# since its inception in the early 2000s. Since 2017 I have started publishing professional video courses at Pluralsight and Udemy and by this point, there are over 100 hours of the highest-quality videos you can watch on those platforms. On my YouTube channel, you can find shorter video forms focused on clarifying practical issues in coding, design, and architecture of .NET applications.
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