Command Pattern in Unity

The Command Pattern is one of many design patterns that every game dev and programmer should have in their developer toolbox. In this video I'll use a practical example to show you how to implement the Command Pattern in Unity, and explain what the Command Pattern is and when it's useful.

00:00 Introduction
00:40 Sign up for the Level_2 Game Dev Newsletter
01:08 Example Project Overview
02:24 Undo Feature Implementation
08:18 Command Pattern Explained
09:43 Conclusion

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[ukl]

Most unity tutorials start from basics and end at basics but I have found your channel to be the only one which gives good information for low to mid level devs who want to jump their careers. Its amazing what you are doing and hope you continue doing it

[AnikenSkiwalker]

Charles, you are a Jedi of Coders. The strength of your teaching is your ability and emphasis is actually implementation of these concepts. Thank you. THE CODE IS WITH YOU.

[saito]

This was what I did for an RTS prototype that I never finished. This pattern allows you to create a system that controls a mass number of unit of different types very easily.

[iHeartGameDev]

Awesome video, Charles! Funny enough, I’m working on this exact pattern at the moment too 🎉 Your explanation’s level of quality here has certainly raised the bar! This was incredibly well done 👏

[therealduckshow]

I think a nice addition to your videos could be to make like a visual overview of the different components of a pattern, how they relate to each other, and what class they correspond to in your example project - like a mind-map, you know? I have a really hard time keeping multiple things in my head at once, but if I just have one image to look over and study it becomes a lot easier to grasp. Still a great video, I love learning about new patterns, makes me feel so much more professional :)

[andrewdudas]

This video was incredibly well timed, I had just decided to try and implement a replay feature into my project and then this video went up on the exact same day. I just finished implementing this into my game and I am watching the game replay itself on my other screen. It is extremely satisfying to watch.

Thank you.

[ledjfou]

You are simply amazing, I spent my morning binging your channel and learning a shit ton ! You are a great great intermediate advanced teaching ressources ! Seriously so much better than most of the basic unity videos out there that don't do clean code most of the time ! Thank you like so freaking much !

[aidev]

When I first started my career 10 years ago, I had to abandon my first big project because, at the time, I didn't really understand functional programming and without it, my codebase ballooned in size and complexity. This is a very good design pattern that solves the problem that I ran into back then: my turns needed to execute their actions in an MTG style stack, and this is how you do that.

[MrHandsy]

I am using the command pattern and scriptableobjects to create abilities in my game. The pattern is amazingly useful.

[LaCreArthur]

I love how chill and cosy the setup is in the few last videos! Keep it up Charles, awesome work!

[ankitr]

The quality of your tutorials is amazing!

[mrbubbles]

Your topics are just pushing the boundaries of my knowledge. I appreciate you levelling me up!!

[XRCADIA]

My spider senses were tingling and brought me to this video :D

Thank you for covering these great design patterns! Great resource for devs!

[BBdaCosta]

Awesome video, I Would love to watch this implementation usinf TDD methodology. I think that people need more examples of implementing tests in Unity.

[cobaltblue]

Just wanted to add that this pattern is a core pattern in writing solid net code with any sort of rollback implementation. All the tutorials on youtube about online-multiplayer games in Unity talk about RPCs, packets, protocols... etc. But they never bring up this pattern. I would even go so far to say any singlple player game which was written on a good implementation of the command pattern is that much easier to convert to an online multiplayer game...

[suchasaltylemon]

I'm a simple man: I see infallible code, I click

[nexxogen]

What I don't like about this is the fact that the recorder is running the actions too. If I was new to this project and looked at the input callbacks, I would only see method names called "record" and it wouldn't be clear to me that those are also running the actions and not only recording them. Also, when something is called a "recorder", I think that you're breaking the "one job per class" principle when you also make it do other things besides recording. I would try to keep running the actions and recording the actions decoupled.

[iiMintyHippo]

I got lost at the action recorder part of the code, to me it seems so impossible to learn how to understand that but I will keep trying.

[voizeh]

Thanks for tutorial!

And I think it's bad, that you call Execute( ) in Record( ) method. Because Record( ) should only record, not call

[adamcervenec]

This is just another level tutorials compared to others. Perfect !