SOLID Principal - Interview Questions and Answers

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Timestamps -
00:00:00 - Introduction
What are SOLID Principles ?
What is Single Responsibility Principle ?
What is Open-closed Principle ?
What is Liskov Substitution Principle ?
What is Interface Segregation Principle ?
What is Dependency Inversion Principle ?
What is DRY principle

[@user-fn3ko9zw7z]

Oh My God! Sir..! the way you explained the Liskov Substitution is awsom. I have gone through many documents and videos, but this is super. Thank you sir..!

[@interviewhappy]

Your Welcome @user

[@asindal]

​@@interviewhappy liskov substitutions and interface segregation are seems similar.... What's the difference?

[@nikowahyufitrianto8623]

One of the best video on Solid Principal explained in simple manner

[@puresoul794]

Thanks a lot sir, I had read/watched about SOLID principals may time but it was not getting clear, But after watching this video with theory n example combo and your short n simple way of explanation, its crystal clear now.

[@lijuthomas5507]

Your teachings are very clear and simple. I have watched many videos about the Solid principle but those didn't give me clarity. But you explained it very well. Now I understand the Solid principle thoroughly. Thank you happy.

[@rounakmukherjee1009]

Best explanation on SOLID. Kudos

[@AshfanSaja]

Thank you very much sir.. i understand it completely.. god bless you and you teaching ability

[@mamathachanda9308]

Good teaching...

[@jabeerbasha123]

It's very genuine review from my end. I am zero to hero for interview preparation with you all interview question and answer videos. Now I am in middleeast with 400 % hike. Really appreciated for the wonderful content.

[@interviewhappy]

All the best @jabeer

[@mohammadrafi8103]

bhai who giving you 400% hike? 🤔

[@iam.friesen]

not all heroes wear capes. you are definitely a hero.

[@interviewhappy]

Thanks brother for appreciating with such beautiful words @iam.friesen

[@dfytq]

Your videos are extremely helpful, I was able to crack 3 out of 5 interviews after watching your videos. Please make some tips or videos on how software engineers can improve communication skills so that they can prepare themselves for the team lead role.

[@Rajdweep]

man you explained better than the guy of the paid course i purchased 🙂

[@interviewhappy]

Thanks @Rajdweep

[@Rajdweep]

@@interviewhappy welcome bro

[@tvsnmurthy2370]

Thank you very much sir for sharing this video... It's very helpful to me. Awesome explanation and easy to understand...

[@MrSHYAM_]

One of the best video on Solid Principal explained in simple manner.

[@interviewhappy]

Glad you think so! @mrshyam1985

[@sasivijaya]

you are simply superb and really master at explaining all these

[@chermalingam3425]

Can you share Design pattern knowledge? That one is more useful.

[@vikassingh-oh6ci]

Awesome know sir. keep it up. 🙏

[@mdweena870]

Thank you! Thank you so much! I've watched so many videos on this topic and couldn't really understand it enough to communicate it until I watched this one. Thank you once again

[@interviewhappy]

You're very welcome!

[@nileshpatel6566]

Please make a video on design patterns mostly singleton and factory.

[@akankshaojha5488]

Very accurate n to the Point example

[@padmashreebaithyar9348]

I think you are a pro in knowledge transformation.

[@faisalTraveller]

Awesome quick contents.

[@Angeluslove7]

Wow, this is the best explanation I found on internet so far. Thank you

[@interviewhappy]

You're very welcome!

[@ananthie8032]

Thanks a lot . Your videos helped me to get 2 offers .

[@aashnavijay1716]

Best and precise explanation of solid principles available on youtube...😊 Thank you very much Sir, Your videos has helped me a lot in cracking 7 interviews. Finally I have got 200% hike..😊 I have gone through your other videos like .net core interview questions, web api, c#, and sql server interview questions series.... and mamy more... You are gem for us..... Thank you so very much...🥰

[@interviewhappy]

Your achievement has truly filled my heart with joy. Celebrating your accomplishment and wishing you continued success. Congrats! @aashnavijay1716

[@simbuvlog4366]

Very clear and Simple Explanation. Thank you so much

[@interviewhappy]

Glad it was helpful! So nice of you to appreciate @simbuvlog4366

[@sudarvendhanmahendran3534]

Thanks for your clear and short explanation with its example. I watched this multiple times. Thank you 😊

[@interviewhappy]

You're very welcome!

[@mariol1436]

You're quite literally saving lives with these videos. Keep up the good work. 💪

[@seanleith5312]

Indian English is not something I will listen to ever. Gosh.

[@sunnypyon7010]

You are the best! Thankyou for explaining clearly and easy to undertand

[@interviewhappy]

Glad you think so @sunny

[@sanjibgayen7187]

I like the way you present all the information. Thank you very much.

[@interviewhappy]

Glad it was helpful!

[@saqtquadri]

LS and DI principles was getting difficulties with other videos, but you clear the confusion, Thanks alot.

[@mdweena870]

I agree

[@suryanarayanbaliarsingh5363]

This is the best SOLID principles explanation.

[@interviewhappy]

Thanks Surya. All the best for your career.

[@sangeetha1713]

Very useful video.simple, easy to understand and clear.

[@interviewhappy]

Glad it was helpful @sangeetha

[@anjireddy4066]

Best video to understand solid principles with examples thank you

[@interviewhappy]

Thanks

[@akshuthegreat8791]

Excellent !

[@mamtakhatana2621]

Thanks a lot Sir, your videos are very helpful and clear concepts thoroughly.

[@interviewhappy]

Glad to hear that. Thanks for appreciating

[@govindbansal2181]

Greatest content 🎉

[@dipakbarnwal6978]

Great mantor ever 😌

[@KinglyStar77]

Thanks a lot sir. I am currently looking to change and you are my guide.

[@interviewhappy]

All the best @kinglystar

[@luisgonzalez8877]

A learned a lot of this video 😊. One more question: To solve the LSP issue the solution is to use the ISP(min 17:50)?

[@berginsheni1717]

Awesome explanation. Thanks for the effort 😊

[@interviewhappy]

Thanks and all the best for your career.

[@anbazhagand]

Nice brother. Clear and Perfect explaination.

[@interviewhappy]

Glad you liked it @anbazhagand

[@Jawad-Amir]

Great video man! Hope you all the best on your teaching journey!

[@interviewhappy]

Thanks! You too!

[@zeeluck7128]

Excellent

[@venudamarla175]

Please make a video on design patterns

[@interviewhappy]

Noted Venu, not very soon. But I will cover them one day.

[@user-yw6ct8vz1x]

Is design patterns available?

[@prernachaturvedi8258]

I have one question for O - if i am adding new method in a class i.e new functionality which is related to that class only is it voilating the principal?

[@hectorluis9294]

Nail It. Best explanation I have found on the subject.

[@interviewhappy]

Thanks and all the best for your career.

[@lajapathyarun4329]

You are awesome 👍

[@rakkarajput]

Yeah finally it's coming 🙌

[@antonfesenko920]

Thank you very much sir, your videos are very helpful and easy to understand

[@interviewhappy]

Glad to hear that @antonfesenko920

[@anjalilawrence7211]

Hi can u give me different between type cast vs convert vs parse

[@caveatashish]

Thank you for the detailed explaination

[@interviewhappy]

Glad it was helpful!

[@shirinmirzimk4818]

first time i understood lsp from this

[@ShanayaBijlani]

Thank you

[@user-ey9cj7ur4v]

nice session sir ji

[@dayal86ald]

Awesome Awesome Awesome ... very helpful

[@interviewhappy]

Thanks Dayal and all the best for your career.

[@yelagandulasridhar7011]

Very nice it's helpful.

[@interviewhappy]

Glad it was helpful! @yelagandulasridhar7011

[@Rajinderdung]

Good explanation of Solid principles

[@interviewhappy]

Glad you think so! @Rajinder

[@srinivasankharpayya671]

Please make a video on design patterns.

[@ammargondal8176]

My Bestest Tutor i,ve ever 😊💯

[@interviewhappy]

Glad to hear that! @ammar

[@marcelositonio2495]

Very SOLID explanation.

[@interviewhappy]

Glad it was helpful!

[@prabhakartiwari1434]

Thank you explained !!!!😊

[@interviewhappy]

Happy to help! @prabhakartiwari1434

[@atulbhandari2786]

Thank you sir very amazing content .pls make vedio for design patterns as well..and authentication in dot web api

[@interviewhappy]

Oh Bhandari ji, great to hear from you again..

[@solankijigar11]

Great video, Sir.👍

[@interviewhappy]

Glad you liked it @ solan

[@khushbuthakkar8219]

Awesome content, I am watching your all videos and sharing in my team as well.

[@interviewhappy]

Thanks Khushbu for watching and sharing. All the best for your career.

[@josecanyousee]

Thanks for the info, Happy. Question at 21:00: When you pass the logger to the constructor as an Interface type in the DataAccessLayer class, is this an example of polymorphism?

[@amodhmandloi146]

No, polymorphism is generally method hiding, overriding and overloading.

[@interviewhappy]

Agree, that is dependency injection, when you inject the dependency service or interface to other class via constructor

[@srinivaskore470]

Please prepare tutorials on WEB API and Java Script and J Query

[@interviewhappy]

You can check my channel. Web API and JavaScript already there. All the best for your career.

[@niteshnitianofficialsongs]

excellent video

[@interviewhappy]

Thank you very much! @nitesh

[@minitam1527]

Thank you so much for sharing this video.. I really appreciate your efforts to make such videos which are short yet covered definition and practical examples both so that it becomes very easy to understand.. Examples make our concepts clear and definition is helpful to represent the concept in interview... 👍

[@interviewhappy]

You got it 100% right. We should know the practical approach, but more than that we should know how to explain the concept to others in interviews. Hidden knowledge will not help in anything.

[@singarasu90]

mvc application front end ui displayed excel file possibility?

[@jithuakumar]

Gr8 sir

[@sandhyaranim9437]

Please post design patterns video

[@someonesoumya]

Thanks Happy from Happy 😀...

[@interviewhappy]

Thanks and all the best for your career.

[@patelnirmal6867]

Sir 🙏, what is the future of .net? I am going to New Zealand after my bachelors. What is the scope of dotnet developer there in nz.

[@chandanar4857]

Sir, please suggest me how to make a proper resume.

[@jayminpatel7838]

Awesome sir

[@interviewhappy]

Thanks @jaymin

[@AasanHai26]

Please sir to make a 1 year angular experience interview series

[@manojjangid6213]

I doubt from my side for DIP. You are creating instance of interface (Logger). But as per functionality, we can't create instance of interface and abstract class then why are we creating in DataAccessLayer. Please correct me if i am getting wrong.

[@prathuriramamurthy6128]

its only type of object...you can pass the instances of class which implement that interface.

[@luisgonzalez8877]

Why are you mixing SRP by using a method focused on the repository layer with another one in the logic layer to explain it( min 04:14)? It doesn’t make sense because each layer has different approach…

[@upscdairies5362]

Sir make video on filters

[@jowbloe4700]

Good videos before... Parts 1-5.

[@jayeshpatel-zx5kb]

Gm can you make video for solid principle in hindi?

[@anusuyaguru4762]

Please make video for design patterns

[@interviewhappy]

Sure will try to do it soon @anusuyaguru4762

[@vemankunoor695]

Is Dependency inversion principle and Dependency injection both are same

[@Vijul-bu6qs]

Dependency inversion is a principle, while Dependency injection is a design pattern (or we can say Dependency injection is a way to achieve Dependency inversion).

[@akshaybhagwat3712]

You're sound on "right" is quite funny. 😅

[@manjunathbadiger57]

Please design patterns

[@shubhankarpaul2740]

You've mixed up Interface segregation with liskov substitution altogether

[@aaronspain3387]

Many thanks and apologies, but on the same I was finding much difficulty in understanding to the needful of the context and grammar used basically in this wideo.

[@interviewhappy]

np, I am not a native English speaker. That's why there is a gap. I will try to correct this in my future videos. All the best.

[@malleshbyri5138]

Please make video design patterns at least any two important patterns

[@interviewhappy]

Sure will try to do. @malleshbyri5138

[@sreejithm4331]

Design patterns video please

[@interviewhappy]

I will try to do in future.

[@surajsingh-py5fr]

​@@interviewhappyfactory design pattern

[@suzeetsingh2284]

Thanks a lot sir, i am requesting can you please remove add from your video

[@deveshkumar3742]

sir i want to prepare for frontend developer interview how do i connect with you

[@interviewhappy]

Thanks Devesh. Due to my own job and limited time, KZbin comments are the only way. May be in future I will plan to connect one on one.

[@muhammadasim5532]

Love from Pakistan ❤ Right 😂

[@interviewhappy]

Love from India

[@user-li3bo5sx1s]

Rightttttttttttttttttttttttttttttttttttttttttttttttttt

[@MK-wc7sy]

طيب لو قلت احبك

[@rohanyadav7327]

Your explanation of liskov substitution is completely wrong

[@SandeepPal084991904]

Complete design pattern video not available on KZbin . So please make videos on design pattern.

[@interviewhappy]

Hi Sandeep, I will try to cover some important Design patterns in future.