Observer Design Pattern explained in EASY way with CODE and Real Examples!! ✌️

A very important design pattern that I have discussed in multiple interviews and that has many applications in real world as well. Let me know in comments how you found the video!
𝐑𝐞𝐠𝐢𝐬𝐭𝐞𝐫 𝐨𝐧 𝐑𝐞𝐥𝐞𝐯𝐞𝐥 𝐭𝐨 𝐠𝐞𝐭 𝐲𝐨𝐮𝐫 𝐃𝐫𝐞𝐚𝐦 𝐉𝐨𝐛:
relvl.co/frp4
𝐑𝐞𝐠𝐢𝐬𝐭𝐞𝐫 𝐨𝐧 𝐑𝐞𝐥𝐞𝐯𝐞𝐥 𝐒𝐞𝐥𝐞𝐜𝐭:
relvl.co/jcwk
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𝐂𝐡𝐞𝐜𝐤 𝐨𝐮𝐭 𝐭𝐡𝐞𝐬𝐞 𝐩𝐥𝐚𝐲𝐥𝐢𝐬𝐭𝐬-
𝐌𝐨𝐜𝐤 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰𝐬 - • Mock Coding Interview ...
𝐃𝐞𝐬𝐢𝐠𝐧 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬 -
• Intro to Design Patter...
𝐃𝐒𝐀 - • Median of 2 Sorted Arr...
𝐃𝐲𝐧𝐚𝐦𝐢𝐜 𝐏𝐫𝐨𝐠𝐫𝐚𝐦𝐦𝐢𝐧𝐠 - • Burst Balloon Problem ...
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• Meet Hiring Manager at...
𝐂++ - • VTable & VPointers - V...
𝐁𝐚𝐬𝐢𝐜𝐬 𝐨𝐟 𝐈𝐧𝐯𝐞𝐬𝐭𝐦𝐞𝐧𝐭𝐬 - • What are IPOs? How to ...
𝐋𝐢𝐟𝐞 𝐚𝐭 𝐈𝐧𝐭𝐮𝐢𝐭 - • Meet my Manager at Int...
𝐒𝐡𝐨𝐫𝐭𝐬 - • Floor, Ceil use for Pr...
𝐂++ 𝐒𝐓𝐋 - • What is C++ STL? Why d...
𝐓𝐫𝐞𝐞𝐬 & 𝐆𝐫𝐚𝐩𝐡𝐬 - • BFS, DFS|Explanation w...
𝐖𝐢𝐭𝐡 𝐏𝐚𝐩𝐚 - • Explaining OOPs concep...
𝐒𝐲𝐬𝐭𝐞𝐦 𝐃𝐞𝐬𝐢𝐠𝐧 - • Factory Design Pattern...
𝐏𝐚𝐢𝐧𝐭𝐢𝐧𝐠𝐬 - • Wall Art | SwitchBoard...
𝐕𝐥𝐨𝐠𝐬 - • Best Ladakh Bike Trip ...
#systemdesign #designpatterns #softwareengineering

[@smithau440]

I used factory design pattern in my interview recently. Your video on factory DSP was very helpful. Looking forward for other design pattern videos.

[@KeertiPurswani]

Thank you so much Smitha ❤️❤️

[@intezaralam9357]

+1

[@spp1896]

Hi Keerti, your design patterns series is really useful, thanks for the effors. I have one request, it will be great if you can solve some LLD interview questions and explain how design patterns can fit into the problem.
This will really help us understand how design patterns can be used in real world problems

[@abhinavr5533]

I love these design pattern videos. The code example helps conceptualize things better.
I use this pattern all the time in my job, since it is part of MVC, where the data-model acts as the subject that is being 'observed'.

[@dineshkumar-kg3ir]

When i started watching i thought you're going to talk about asynchronous js redux and all. But it was really good quick intro to observable pattern. In extra revised all oops concepts as well :)
Thank you keerti

[@neebanv]

Watching youtube videos were never as informative and organised before. Appreciate your effort. and thank you so much😘

[@sayandeepghosh2911]

Please push design patterns videos quickly. It's really going to help a lot of beginners like me. Thanks for such a precise and quality content ❤️❤️

[@user-fp6xd1mv6i]

Your videos are very concise and to the point. Very good for strong basics.

[@intezaralam9357]

Hello Keerti,
They was you explain the concepts and then code it up is super easy. I have seen a lot of design patter tutorials but yours is the best one I have come across till. Thank you so much.

[@maniyadav3256]

Wow , I really liked it!!! I would like to have more examples on each pattern , please do suggest any resource for this !!

[@handover007]

You have simplified this pattern really well. Thanks a ton. Keep making more videos.

[@roushanraj8530]

Top notch content di, eagerly looking forward for more videos in this Playlist...., this Playlist is going to be best on TH-cam 💯💯

[@AdityaDey424]

Didi I am requesting to your , please try to upload other design patterns. Your explanation is really appreciable. Just watch once and never forget..... Thanks a lot 👍

[@herculean6748]

Thank you so much! best explanation and thanks for making it in C++

[@abhinavmisrha4259]

thank you ma'am for your simple explanation.

[@basicthings5506]

Very quick and to the point explanation of concepts 👍👍

[@ersarthaksethi]

greatly explained

[@anuragmalviya2397]

Hate the number of likes you get,like they're merely 8% of what you deserve according to the content you provide.

[@colinmaharaj]

Guess what, I understand the pattern, but recently we had an old sms system without an API. I used Wireshark to decipher the packets, from an old app, compared it to a documented protocol and got it working with my own API client library. I did something similar for an old email server. I used the first library and extensive knowledge of email protocol and email messaging to create an email to sms gateway. cool.

[@balajijangde8470]

Great explanation mam, waiting for this type of content from a long time 👍👍👍👍👍

[@rahulpatil4749]

Doubt :
i have implemented it without using "ISubscriber" , instead i used "User" every where and it works fine.
Is "ISubscriber" class really necessary ? if it is why ?
P.S : Thanks for the playlist.I have watched all videos in this playlist its really great.

[@saivirat1056]

There can be different types of subscribers with different kinds of notify implementation.

[@hyperme1831]

A well written code with explanation for code of Observer Design pattern us there in TechieContent medium article . Read that

[@sujatadeshinge7936]

Nicely explained, plz keep uploading videos on design patterns

[@rajatahuja8747]

In class "Group", Can we have list of 'User' instead of 'ISubscriber' like "list users;" and also in other functions having "ISubscriber" ?
Basically not having the "ISubscriber" class at all. What is the purpose of having this Interface?

[@anuraggoyar]

Hi,
You said you did used the observer design in 3 of your interviews. I would be interested to what was the context and how you used the design pattern. that way we can relate more to the real life examples.
Appreciate you work.

[@rohitkesari229]

Hi Keerti, my friend (SS) is saying that kuch khaas nhi h is video me, Please upload a kuch khaas video on observer pattern for her😅

[@shambhavisharma6283]

😂😂

[@rogueranger9032]

Hi Keerti, I am currently working in a startup which has a tech stack of React Native, a hybrid platform to build mobile applications. I saw your other videos and see you have given a lot of interviews. Congratulations By the way! So in your opinion does current stack matter if I want to switch to a SDE role in big tech companies? Or DSA, HLD, LLD will be enough?

[@rohansharma8618]

I work at flipkart on React native

[@shakshamchauhan1387]

Amazing content, and looks very helpful.
So a big Thank you.....😇

[@sree1149]

Thanks a lot for the clear explanation 😊

[@enter.netinfinity6136]

I am subscribing ur channel by using ODP hope u will be notified if i understood the concept right 😝😝

[@auroshisray9140]

Thanks a lot for this insightful video!

[@nitinsinghchauhan5186]

easily explained ...

[@AbhishekKumar-yv6ih]

Great video, very simple explanation. Keep them coming

[@abhisheksharma8757]

Hello ma'am u r doing great..your explanations are so ... soo good..plz upload on some more patterns

[@manas_singh]

Great explanation!

[@nagavijaykumarprathi8531]

Your always awesome.
Thank you so much for making things super easy.

[@KeertiPurswani]

Thank you so so much 🥺🥺🥺🥺❤️❤️❤️

[@debmalyapan53]

much awaited, loved it. plz do the same for the rest of the patterns as well soon.

[@KeertiPurswani]

Coming up soon. Next one coming on sunday. Please do share with your friends ❤️😇

[@AZ-se5je]

I'm just curious about "Why did you used list?" only. We can use any std::vector as well right.

[@vickychettiar5756]

Hi,
why did you create an interface ISubscriber and made your users implement that. What was the specific reason for doing so?

[@bhargavim9861]

why not kafka?

[@puneetsharma3583]

Why didn't we create the list with user class itself instead of creating another class Isubscriber. Please explain

[@GRHmedia]

You used a list and pointers to register users. Both are antiquated methods. It also is bad for performance. Use a vector instead.

[@aribashhar3960]

Why do we need ISubscriber interface ? since the notify method will be same for all users why create a redundant interface ? we can just create User class and make list it works right ?
Please explain what am I missing.

[@puneetsharma3583]

I have the same doubt. Have you found the answer yet?

[@akashpawar3382]

could you please make a video on VISITOR Design pattern

[@AshishGusain17]

is interface necessary here?

[@kshamapathak4693]

Can u explain it for python programming..

[@nikhilsaini5284]

Is redux use this pattern,
Like whenever state change is re render all subscribeed components?

[@urpradhan]

In user ctor we shouldn't be using this pointer, rather we should initialise the memeber with initialisation list.

[@santoshkumarpaul5304]

Mam plz make a detail video DSA+python 🙏

[@bhargavtupakula9896]

can someone provide the code snippet pls

[@zerro361]

Great video. Congratulation! However, I was wondering. Don't we have a memory leak each time we remove a subscriber?

[@shubhamtiwari7704]

can anyone please clear, why it is , list not list ?

[@shubhamtiwari7704]

@KeertiPurswani

[@2587shiv]

Can you provide the Java code

[@vvpChannel3112]

You know what problems I have seen in your code....you have not used destructors in any of your Design pattern code...people may forget about destructor in interviews

[@monicachhabria3406]

Please give timestamps . It would be helpful

[@SoulMusicEuphoria]

Marry me!

[@ShivamKendre-fc3su]

great explained

[@sharatpaul]

Loved it . Nice and short explanation !!

[@KeertiPurswani]

Thank you so much ❤️😇

[@sharatpaul]

@@KeertiPurswani 😊❤️