Command Pattern - Design Patterns (ep 7) 

2023 and still one of the best Design Pattern Playlists.

Your design pattern playlist is one of the best explanations about patterns ever. The last video of this playlist is over 4 years old and there are many patterns left (visitor, chain of responsibility, flyweight, builder, etc.). Are there any plans to cover these ones? It would round this awesome playlist more up :)

Student: Can we do this one by one? Christopher: Yes, let's do it one by one by one by one.

In my youtube browsing career of 9+ years,this is the first channel/video where I am commenting and liking. You really deserve this.Hats off to you Christopher Okhravi

It's been more than 5 years for this video yet no one has ever touched your level of explaining things. Simply a gem. It's high time now , please make more such videos.

At around 25:20, Chris mentions that command pattern is similar to strategy pattern, and he wasn't sure what the technical difference was. To me, the difference is that in the strategy pattern, the object that gets passed around is an algorithm (i.e. HOW to do something). On the other hand, in the command pattern, the object that gets passed around is a command (i.e. WHAT to do). For example, let's say we have a list of elements. If we already know that we want to sort the list, we might use the strategy pattern to determine how to sort the list. On the other hand, we might use the command pattern to determine what operation to apply to the list, such as to sort the list, or to add an element, or to remove an element, etc.

I wish I had these videos back when I studied CS. You show off everything about the patterns. The What, the How and the Where. Some of these patterns I fully understand now, 8-10 years later.

You deserve more subs man. One of the few people I can actually stomach when talking and design patterns.

THis is really, really good content. I love how you discuss your own opinions on how these patterns are constructed.

Trough out the years i always come back to this channel when it comes to patterns. Noone explains it close as well as you do. Thank u alot

This is "Mr Bean" 30 years younger teaching Design patterns! Good job on your videos 💯

Thank you Chris. I was afraid of tackling design patterns as a self taught but you have made this portion of the journey so much easier. Keep going man. Your amazing!

I'm from Argentina, and I'm studying Information Systems Engineering , and in systems design subject my partners and me are studying Desing Patterns. Your explanations are great for us. Thanks a lot!

Thanks, Christopher, it was a wonderful explanation. I have started this Design Patterns playlist a few days ago and I got addicted to it as you made them so easy to understand.

I could listen to you talk about Design Patterns forever!

I really want to say thank you so much. I don't learn from just reading books very well but I can learn great from fantastic lecturers such as yourself. I've actually read this book but my understanding of design patterns has increased so much from your videos. Thank you. Really I mean it, thank you so much. You have helped me become a much better developer.

Thank you! Thank you! Thank you! I am an auditory learner which is a very serious challenge to learning programming. I've read the books, read the sites, and watched a few other videos to try to understand this pattern to no avail. Within 5 minutes of watching this I understood more than all those other resources combined. Don't change a thing! I know visual learners may not appreciate your work the way I do but I also know that the resources out there are hand made for them.

I knew you won't fail us man! I was waiting for the next one since the last dp video :)

21:09 you alright my man? :D

This was so good I feel genuinely mind-blown! The command pattern is crazy powerful

Спасибо большое Christopher. У тебя хорошо получается объяснять такие сложные темы простыми примерами из жизни. Как раз то что я искал. Удачи тебе.

I've been watching 20+videos these days to get this pattern, this is the one that made me understand what it is !!! thank you so much

I am impressed by the way you make us understand 'Design patterns'. Thanks a lot Christopher Okhravi

I really appreciate this series. I prefer this before any other series in Netflix 😎 You make me laugh loud and in the same time give me understandable patterns ✌🏽

I am about to start my next semester learning all these patterns. Thank you for covering them! Also 21:10 was seriously hilarious! You're comedic skills are on point!

I built an AT Command Builder in order to build specific routines to program a network module. I didn't know that was a design pattern. My head exploded with this awesome video! :) Thank you, Christopher! amazing videos!

You saved my life. Thank you for the series on design patterns. You are really good at explaining things

I'm new to design pattern and at the end I was like, "yoooooooo!!! This is amazing!!! Where do I start 👀👀? “ Your episodes on these are awesome. I love how you explain these in several examples and in different view points along with real world applications and most of all the example of code. This is how I learn and I wish I had someone to explain things to me in the way you do. Thanks 😉👌👍👍

I've been waiting for the next instalment in the design pattern series. Love and appreciate your videos!

Man I'm really amazed with this explanation!! Mind blowing!!! If I could put all my former university teachers to give a class like that, they wouldn't be capable to do it... Congrats Christopher, you are doing an amazing work...

Videos like yours make me wonder why I even bother with most of my uni classes where the explanations are often unclear. This is so well explained and it probably saved me a few hours of studying. Thanks!

I studied few patterns from your video only and they were asked in an interview...followed your style of explaining the patterns and I got selected..thanks man. Your knowledge inspires and motivates me to learn more. ✌

I really love your way of explaining man, it's simple and you cover all the important stuff. I subbed!

Another example would be building a calculator: We have multiple Commands: Add, Subtract, Multiply, Divide, Redo, Undo We have a Calculator which has buttons that invoke these commands. Then our receiver which is the display, shows the results of those commands. I'm loving these videos! Starting to see the world in a brand new way! Thank you so much!

Your way of teaching is simply superb! :D Keep up the good work! :)

This is the super easy to grasp man.... I'm watching this now, after learning Design patterns before 10+ years back.. I worry, I didn't have RU-vid and videos like yours in those days.

Best series on Design Patterns. Binge-worthy. Thanks a lot.

A crystal clear explanation, well done! Videos length don't matter when video is rich in content

great work bro.. I am an experienced developer without much knowledge on design pattern. I tried many tutes, but yours is the best. thank you very much

A great approach to explanation, MR Okhravi! Thanks for the video!

Hey Christopher, I'm new to C# and wanted to say a huge thanks for this video, its entertaining as well as educational - I can now follow some code at work and understand better - top job my friend !

you definitely are the best lecturer/teacher I have ever seen .... so brilliant

Wondeful series of videos, it's the first one that I follow that makes me want to rediscover design patterns :-) IMHO the big difference between the Command pattern and the Strategy pattern is : - Command pattern : the invoker exposes a set of commands that can be used by a client, ie: myObject.MyCommand.Execute(), in this case the contract is between the client and the command - Strategy pattern : the object that contains strategies exposes methods that are then delegated to strategies, ie: myObject.DoSomething(...), in this case, the contract is between the client and the object, the client never calls directly the strategy In the example, the Click... methods should not exist, they actually represent the action of the user pushing on the button, otherwise, it's exactly the same as the strategy pattern ;-) Hope this helps.

Please complete all design patterns not only the ones covered in Head First Design Patterns, but your videos are also so good I really love these design pattern videos a lot

Thanks so much for this video. I just started working through Head First Design patterns and you are helping me expodite the process (I'm not a big fan of reading to learn programming simply because audio is more efficient)

Wonderful! I'm trying to learn to program and I was deferring learning about design patterns because they seemed too complicated. Your videos have changed my mind and I am managing to understand every single one of them.

Christopher, you are an awesome tutor, great explanation, and feels having discussion realistic and face to face, Thanks... Please keep it up

thanks man really helped me out. Really chill way of explaining things

Love your videos and way of explaining it. I have confidence that now I can also learn design patterns.

When they print a new edition of the book they should reference to this series :) Very well explained. Like the way you present the topics. Respect. Can't wait for the next one...

I like your way of teaching. Thanks a ton for making things simpler. You rock!!

I was really struggling to wrap my head around this one, just because there is a lot of verbiage thrown around very quickly, making it hard to latch onto anything in every other explanation. I really needed the time you took to break out down, rephrase sentences, etc. It's much simpler than everything else made it seem! Thank you so much for making this!

I'm pretty late to comment, but just saw these videos. WONDERFUL! one of the best I've even come across. Thank you so much Sir.

Second time i watch this. Great explanation and real example !! :) Like i heard good material always should be inspected twice, because you want to get all information clear.

You are just awesome....I'm very new to design patterns...and this video really helped me understand...Thanks alot...😊😊

Another excellent explanation of design patterns. Thanks for these videos. By the way that 21:09 was amazing. I just rolled back to see that again :)

Great explanation! I have been watching this series and so far this one is the first to make me actually laugh out loud :D 21:09

Thank you for the amazing video series -:) This was pretty awesome.Having said that,i felt the way this scenario was implemented in HeadFirst book(using setCommand method to map a particular slot to an implementation of ICommand interface) seemed a bit better /made a bit more sense

Thank you man, never had time to finish reading this, book and yeah, you explain it will enough that I can follow and not trail off.

Your videos are great! They got me an A in my programming exam about Design Patterns :D! Well explained, easy to follow, and entertaining. Thank you

awesome! I begin to love design patterns after seen your good explanations! great job!

Very well explained. Able to understand the command pattern with clarity. Thanks a lot.

Was struggling with the Command pattern until I found your video, very clear explanation. Thank you so much!

this is so very enjoyable, I am having a great time reading this book and watching your videos. thanks!

Thank you so much for all your videos. They are VERY helpful along with reading the book

Now I don't need to get bored with the book.I get the point fast and furiously:) OK, I play the video in 1.5x speed sometimes, but you've done a GREAT JOB here. Thank you!

Amazing video series. I'm currently reading the book of Head First, preparing myself to the Master Architect of Java and I found your videos like the perfect complement to the reading. Thanks a lot. By the way I did send you a connection request on LinkedIn

Best series on design patterns on youtube

For me this series is extremely useful. Thank you!

Fantastic, Wonderful explanation , Thumps up. Waiting for another Design patterns

best series on patterns online

Great Explanation Christopher! Thank you very much for this video!

Please continue the series man. great explanations.

superb, simple, easy explanation. clearly understood the concept.

Nice explanation, thank you for sharing with book titles in order to study it thorougher .

Waiting for next one ........ From a week. Thanks dude. I am able to finish half book in week. Really admire your work

Thank you for this film and every other. Great job 😊

After watching this video I went smart home 🤣 Excellent video as usual. The Hue control is a fantastic real world example!

Make more videos! Loved your design pattern series, in fact all of the codewalks too

Amazing tutorial! Don't stop uploading : ) Subscribed!

21:10 scared the shit out of me I thought someone in my room fell. Also: you should make videos again! I've been watching quite a few of your design pattern videos the past week and I've really been enjoying them. I think the same kind of videos but with data structures and algorithms would be super super cool!

Love these videos! They are very clear and useful

Spent 30 seconds on this and immediately Subscribed.

Thank you for the AWESOME videos! Really helped me a lot!

you have got great teaching skills. carry on the good work. God bless you

Only of the super rare videos that I watch at normal speed, which tells you a lot. :)

Your videos are gold! Thanks. I hope u Keep doing good soft engineering content🤗

awesome video ! It really helped me out understand the command pattern. Thank you very much !

You really rock man ! . Excellent clarity in concepts and ability to communicate it in simpler techniques . Please publish some vedios on AI and stuff as well.

Best explanation I have come across. Hope you do similar videos for Head First OOAD book as well.

you ll most likely make me pass my exams with these clear explanations! Thank you

Thanks for sharing your pack of information. It does help us a lot. You helped/taught me with perception of information.

What a guy offering this advice for free!

a very sad story, i'm buying a pluralsight membership to understand the design pattern on this free channel. You are awsome an you deserve more than a like.

Ye-as! Finally! A pattern no one can properly explain explained by you! Awesome stuff, man.

Thank you very much been tryna understand this command but I feel this is the first time I actually got a good hang off it plus I think i am more likely a visual learner

Wonderful session. Thank you so much. Also can you please explain constructor injection and parameter injection with an example? It helps us lot.

Thanks for this playlist. I find it extremely useful

Thank you very much for the lucid explanation!

The beginning of these videos always makes me giggle with that goofy entry of yours 😂😂