Open/Closed Principle Explained - SOLID Design Principles

Thank You So Much for this wonderful video................🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻

Great tutorial! Just one question:
Shouldn't the <QuestionType>Question classes not know the printing behavior i.e printQuestionChoices()?
It might sound better to say rangeQuestion.getChoices(), which returns an array of the choices and then:

printQuiz(quiz) {
quiz.getChoices().map((choice) => console.log(choice));
}

Just an idea :D

Its a bit difficult to immediately understand the benefit of this approach.
What if business decides to introduce a time limit for each type of questions(different types would have different time limits)?
You would need to update all the components separately but you would also need to update 'printQuiz' as well to call for the relevant method each time....

The explanation is brilliant

Umm, what if the questions is come from external sources like database.

For each data we got, we still need if statements to construct the class correctly.

Let say,

if type === "multiple" then new MultipleChoice()
else if type === "single" then new SingleChoice()

does this violates the ocp rules?
pardon for my noob question 😊

wow the best ive seen so far !

Suppose you're fetching these details from a mongoose collectiion . The result is an array of objects with type and all details . How would one implement this principle then ?

This is quality content

Brillaint!

Best explanation of the concept, and I searched quite a bit.

thanks for the great example explaining open closed principle.
the following question is what about c++ example since c++ cannot put objects of different classes into an array?

Excellent Explanation.

I understood and I liked how you explained with js and one bad point that I can see with js is because we cannot declare interfaces to be implemented and then we need to make sure that the name of the method is really the same between those classes and having an interface to declare this method would be better because we could create RangeQuestion class implementing idk "PrintableOption" class in order to not worry about writing the method with the same name

thanks

I need source code Please

Hi Kyle, but what if another new question has to output more than description and choices. How to implement that within the printQuiz() ?

i really appreciate your efforts !! thanks a lot

Excellent!

I think I finally understand this principle after reading about it numerous times over the years and watching other videos. Good example, thanks!

Nice video! already a subscriber!
But could you also include in the SOLID videos how to solve the same problems but in FP not only OOP, just for curiosity.

Nice!
Good Stuff.

I figure a case where if statements are not in violation is in, for instance, algorithms, where you may be comparing index or key values, etc. for for instance sorting operations.

One concern I have in regards to Solid thus far is that it seems to create redundancies, which in turn may lead to more changes being needed. If, for example, two classes use an identical implementation of the same function, if you modify one, you're likely to want to modify the other...

You are very good 👏

js is stupid

Best explanation ever!

you are not the one should thanks us , we are

What if the method requires different arguments to achieve its functionality? Then how would we implement that? Surely we wouldn’t know what to pass in ? Your great btw Kyle.

I have a problem doing this in MVC pattern because a lot of my else if statements target and mutate models in seperate classes, which means my version of the printQuestionChoicr relies on three other classes. It’s a game of monopoly I made. E.g my polymorphic method would each call methods of other objects and since my objects are instantiated inside the controller !

Hi Kyle! Is there a repository of the SOLID code? I couldn't find it in Github! :(
Thanks for the content!

Great

This was really clear, very clever example, Thanks!

This is a good explanation of O/C principle

Main line was: This principle allows you to extend some code without actually making changes to the code being extended.

this channel and net ninja have changed my programming life

thank you so much, that makes it so much easier to understand.
If I understand correctly, that means your program should be able to be extended without modifying it. As modifying a class can modify it's functionality with other dependencies, but if we just extend the class, it will not affect those dependencies.

This was really well explained, thank you so much for the clear explanation. I am definitely going to watch the remaining videos you did on SOLID

You are an excellent teacher.

awesome video, thanks author.

your sample code is amazing, I'd really appreciate it's elegant logic.

Great example and explaining

can I give this video a thousand likes???????

I have been programming like that without knowing the open close principle

As I understood the open/closed principle: Open for new "data", closed in behavior.

Amazing 😀 thank you 😊

Is it just me or does this seem more like a Liskov Substitution sample? I think Open-Close is more for extending the functionality of a call without changing the main class. For this, I'd make use of the "extends" key word. Still this was really well explained.

What’s the difference between this and the Command Pattern?

That's a genius explanation!!

This is really good. Thanks for sharing 👌👌

Makes no sense. You had to do more work following the open-close principle. Downvoted.

Everytime i want to make my code cleaner and simplier, I go to WDS. Thanks Kyle!