Understanding The Visitor Design Pattern

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Welcome to my Visitor Design Pattern Tutorial! This is the last part of my design pattern video tutorial.
The Visitor design pattern allows you to add methods to classes of different types without much altering to those classes. You can make completely different methods depending on the class used with this pattern.
With both the video and the code above you should be able to start using this pattern in your code easily.
Credit: www.javagists.com/java-visito...

[@TheSimpleEngineer]

Let me know what design patterns you want to learn!

[@TheSimpleEngineer]

@@dg10mcdos cool 🙂 I'll do that one next

[@hinathahseen8643]

Thanks for the above one. Double dispatch couldn't be simplified more.Can you t explain examples of Extension object and Template method design pattern:)

[@mirazzaidi]

Can you do a decorator?

[@deepankarsingh7230]

Can you please make a video on strategy design pattern?

[@Nemecis313]

I would like to understand the Mediator design pattern if possible. Thank you for this video!!

[@mehmeterdem7581]

This is probably the best video on the net for this pattern with a perfect example.Thank you!

[@piotrpieniak738]

I'm so grateful for it, good job! I always struggle with theoretical explanations and definitions, so combining them with actual examples made it so much easier to understand.

[@chiranjeevisaride8655]

The best explanation anyone can find on this planet. Absolutely loved it!!

[@ilstam9942]

Awesome explanation and helpful example! I hadn't realize before about the double dispatch problem. I really liked that you didn't over-explain things keeping it short and to the point. Also thumbs up for cutting out the tedious parts where you just paste code. Thank you!

[@soumenadhikary4332]

This is one of the best explanations of double dispatch I have come across!

[@YakimRachev]

The greatest tutorial for the Visitor pattern I found so far! Thanks.

[@prateeksingh4078]

loved the way you explained it with an implementation made the video so much more intuitive!!

[@rahulsaxena9103]

He has made the pattern as easy to understand as hard it is going through other explanations on the web. Amazing!!

[@deepankarsingh7230]

Amazing explanation. I like discussions a lot when it cover the background as well like why something is needed, current limitations in some paradigm and ways to solve that. Thanks a lot for the video. :)

[@fakhrshaheen3394]

very well explained.it's really one of the most underrated patterns

[@zizimouad8291]

THE only video explain this pattern in the right way ! explination, diagramme and exemple with code all are perfect

[@speyck]

Gotta be the best explanation of the pattern I've seen yet. Thank you for making this free :)

[@nikolaradovanovic4883]

Great content. Much cleaner than many of docs I read.

[@herrgrillparzer]

Such a clear explanation and great examples. Thank you so much for this 😊

[@PrashantGangwar]

I've seen lot of videos on this pattern but this is most real life understanding video on Visitor pattern, Thanks for this amazing video... luckily found this

[@sohailiftikhar207]

Beautifully explained.

[@samilozcelik8356]

Thank you. Perfect explanation with a perfect example.

[@tobechukwunwatu848]

Concise!, Clear!! and Simple!!! Thank You!

[@amitsamratmaurya3170]

Best content so far!! You won't need to read anything else after watching this.

[@michaeljuergen4326]

Very good explenation, this is the Video I was searching for the whole time

[@glenndify1]

One of the best explanation of the visitor pattern

[@dhapategeetanjali741]

I wonder all over the internet to find the best to learn visitor design pattern and finally landed here and writing comments middle of the video, This is an awesome video so far I came across. Buddy keep it up you are the best.. !!!!

[@FernandoNavarro_1]

Very clear presentation and illustrative code. Thanks

[@Rastrigin]

great job man, love your setup as well

[@burakkirazli3759]

This is the most clear explanation I have ever seen.

[@bimarshsharma7556]

Thanks for the clear and straightforward explanation.

[@TheFrogfather1]

Nice clear explanation. Thank you!

[@MirekKrenc]

Very well explained. Thanks!

[@nadiadima9449]

Very clearly and neatly done. Thank you!

[@williamquintero3133]

Excelent bro... i've just spend a lot of time trying to understand this patterm. And you did it in just 30min :) thanks..

[@itsnaafiess7193]

Very good explanation. So far the best explanation and presentation on this pattern and finally I got it understood. Thank you very much.

[@whatever6223]

Excellent explanation. Thank you very much!

[@lucykuo4769]

Finally found a great video for visitor pattern! Hope you can make more design pattern tutorials

[@ambarishkapil8004]

This was very nicely explained. Thanks

[@cursedkid25]

I genuinely loved your video and your explanation

[@yolokazinogantsho8111]

Great great great explanation. Totally understood! Big thanks

[@reallylordofnothing]

really good video. came here to understand rsql-parser visitor pattern. I can see that this pattern explains open closed principle very well

[@csforlyfe4206]

Very good explanation of the concept! Helped a lot!

[@drewenia]

The best video on the internet. Thanks for.

[@jaydenhooper]

Excellent explanation!

[@andreslipinski5922]

Thank you for doing this. Really clear explanation.

[@karanagarwal3091]

Beautifully explained

[@AlbertoGS1990]

You are the best explaining design patterns. You should make a single video for every single pattern in the book. Thanks a lot for your teach.

[@gunjanchaudhary9716]

The best Explanation !

[@simoncatteau2879]

Very clear video!

[@HassanBadir]

damn, this is well explained, when I look for a new topic to study I usually run through multiple videos until I understand it completely, this time i watched the whole video once and got it on first time this was amazing thanks a lot man, big like!

[@andrewprotasenya7469]

thank you very much, I finally understood the essence of this pattern

[@AnewbproMC]

Amazing video! Thanks for the explanation

[@rezasaidafkan8698]

Crisp! Good job!

[@ArvindDevaraj1]

very clear explanation of visitor pattern with real world examples

[@luyandamsomi8402]

great job man, really appreciated💪👏

[@aelafdev]

by far much cleaner explanation. visitor is mystrio no more. thank you

[@saeedmirzaei1]

Excellent explanation. Thanks so much.

[@deepakkeswani3241]

Super explanation of Visitor Design pattern.

[@saurabhchaturvedi6982]

Awesommest post on the internet on Visitor Design Pattern !! Understood everything in such a simple way that its gonna stuck in my mind forever !! Subscribed !! Thank you..may you have many more "Visitors" on your channel 😅🤟!

[@TommyBoy7Heads]

Legend.. thanks for the great explanation man.

[@rohitupadhyay9964]

Awesome tutorial, thanks very much.

[@kankipatisaikumar]

@the simple engineer Great explanation, easy to memorize

[@ivannav]

Great job!

[@jellyoful]

Brilliant explanation.

[@agatalach2855]

This is a great video. Super clear explanation, great example, and the whole video was really well done. Thanks so much for your work, it's really helped me understand the pattern and I am now going to go check out your channel for more content, which I'm sure will be as good :) thumbs up!

[@ruixue6955]

2:50 UML dia of Visitor Pattern 4:20 the original piece of hierarchy 6:50 why - single vs double dispatch 7:39 single dispatch 8:14 what single dispatch allows us to do 9:58 double dispatch: interaction of 2 objects 10:12 example 10:28 modify the interface: in Animal interface, add makeSound(Dog) and makeSound(Cat) 11:45 *compile error* due to not support on double dispatch

[@usamakhawaja8571]

Just half way through the video, and I would like to say "Good Job". (y)

[@Kavorka666]

this is great video. I wish you would continue more on this playlist.

[@atulsaxena4286]

Very nice videos probably the best on the internet. Please do other patterns as well with the same kind of explanations you have done in these videos. Thanks.

[@JoshuaKisb]

Wow. awesome video. great explanation. thank you

[@deltaphilip8611]

Finally make sense. Knowing what to accomplish makes it easier to understand how to do it

[@ravikumaralabaka472]

Thanks for detailed explanation

[@rolandsoftwareguy2515]

Excellent explanation especially of the why. A lot of tutorials just go straight into the how. I think given the extensibility problem, I might have initially gone down the passing of delegate route or maybe another interface - but I guess this seems somewhat tidier. Note to any other C# Developers reading before watching, the video is still easy to follow. Well Done 👍🏾

[@MrEthera]

This was amazing! A colleague of mine used this pattern without using "visitor" in the name. I understood the structure and how to use his design, but I didn't fully grasp everything that was going on or how he even came up with it. He mentioned visitor and here I am. Thanks for the concise but real world example.

[@TheSimpleEngineer]

Great to hear!

[@dattatreykulkarni6472]

Good Job Bro!!!

[@andres5709]

i'm no kidding there's a job offer in play here, and I have to deliver a code using this very pattern and i couldn't get it before watching this amazing explanation of yours! thank you for time and help from Brazil!

[@genovo]

Problem: 12:56 Solution: 28:00 Fantastic video!

[@sv3167]

Wow, pretty legit!! I understand!! Thanks a lot!

[@adamblance3346]

Thank you! So many other videos on this feel rushed and don't go into enough detail.

[@tamilmanimuthusamy5506]

Very good explanation

[@MrJonnis13]

Simply excellent explanation of this design pattern. As you said, this one is underestimated but it is super useful. Please consider doing some other design patterns, especially the "not easy" ones Thanks again for this video

[@eliyahuspeyer1696]

your wonderful! thank you!

[@stephane3115]

great explanation!

[@TheSimpleEngineer]

Thanks, glad you enjoyed!

[@kinvain]

Really like your video. Especially that you extend fake Animal interface use case to something more realistic.

[@ashrasmun1]

I would love to see constructive criticism from someone who disliked this video. I think it's unbelievably helpful, especially given that you explained the whole "dispatch" thing, which is not obvious at all for beginners. Thank you very much!

[@TheSimpleEngineer]

Thanks, glad you liked it!

[@samitabbakh8409]

Really nice explanation. I hope you would do a complete playlist of all design patterns. It is a shame that you made only 3 design patterns.

[@mohamedsleymi4318]

Wow thanks man

[@rsdntevl]

Thanks for the intuitive example! a larger font would be great

[@allen0hu]

WTF this is so well explained! Thanks, saved my finals :)

[@DigitomProductions]

Thanks for this video. Life saver :)

[@krishnasagaralugubelli8752]

Thank you

[@kushal800]

best video. love from india

[@peacefulwater9689]

very good video, explaining single vs double dispatch really cleared it up. The only thing I didn't like was the intro

[@XxTonys555xX]

thanks

[@LemmeTellMe]

Good job on the video, heads up though the intro music could be tuned down a bit since it feels a lot louder than the rest of the audio

[@martinx3856]

Good job, nice voice

[@mrowox]

This is really fantastic. Is it possible to combine this pattern with the Factory pattern for example to dynamically determing which credit card to use in a certain scenario

[@mirazzaidi]

Great explanation! I am just wondering why you didn't overloaded the visit method in Visitor interface with Concrete element parameters and created 3 separate methods for each method.

[@leepoking]

Too good

[@illosophycom]

Isn't this still tightly coupled though? If you get rid of the Bronze Card or add a Platinum card, you have to update your OfferVisitor interface and all of the classes that implement OfferVisitor right? That's still a maintenance nightmare. It seems like the problem wasn't solved but just relocated.

[@TheSimpleEngineer]

There will always be some coupling, but the amount is reduced as your class base grows large.

[@256sks]

Thank you for good explanation. Your final implementation require small correction. Visitors classes should have overloaded method rather than different name for different CreditCard. Otherwise it will work without double dispatch.

[@atamanson]

Thanks for the awesome videos. Would you say Visitor pattern is suitable for basket/cart system ?

[@AB-os3jy]

it would be a hit if you could do a series or video that puts together and deploys a multi platform mobile app. bonus if it has animation , audio and 3d capability.