31. Design Undo, Redo feature with Command Pattern | Command Design Pattern| Low Level System Design 

One thing I like about you is that you try your best to give attention to all the posted comments/questions. Other youtubers just ask audience to like and subscribe.

Thanks for the video. The Undo Operations needs to be clearly explained by Interviewer, as Undo May mean not just Inversion of Last Operations But also Performing the Operation that was prior to current operation. Example : Turn AC on SetTemp Undo So at last Undo might refer to revert of last Operation i.e. set Temp and hence implementation could change as per this.

LLD and HLD is soo interesting because of you 🙃 .Happy Coding

It will make more sense to accept command as method argument in MyRemoteControl instead of constructor arg otherwise every time I need to execute a method(command) I need to create 2 extra objects ie 1 MyRemoteControl 2. Command.

Very nice video sir ❤ I guess Doubly linked list is more helpful here in case of remote control buttons. Can insert from rear end and remove from front end or rear end only as per requirement. Thanks again !!

Thanks for the great explanation! I have one query If we want to also provide the setTemperature(int temp) to the client, I can think of 2 solutions: 1. Have one more method execute(int temp) in the command interface to support the setTemperature(), but TurnACOffCommand and TurnACOnCommand will have to unnecessarily implement the execute(int temp) method. 2. Have one more command interface which will have execute(int temp) and the SetTemperatureCommand will implement this interface while the existing TurnACOffCommand and TurnACOnCommand will implement the first command method. What should be the ideal solution for this usecase?

Will using DLL make more sense in place of stack - as we have no control over size of stack; with DLL we can insert commands from one side and remove commands from the other side ( if undo DLL size grows beyond initial capacity, let’s say we only want to store last 5 commands) ?

target I am setting for myself for this year to complete is your lld+ hld + java + springboot videos with coding practice and complete the head first design pattern and clean code books (2 times minimum)

For undo redo, isnt memento pattern more suitable?

thanks for resuming the lld series

Thanks for great content .Appreciate your efforst👍👍🙏

Best Explanation !!!

I love LLD more than HLD, Keep LLD coming

try to tell beforehand what you are actually building so we can check what is wrong with the given solution at an early stage.

Great explanation 🎉

Recently you have changed the notepad . Which is this android or iPad . Looks nice. Please suggest me . I want to use for note taking.

I guess it can be done by facade design pattern as it provides a simple interface to the client

Great work ❤

Hye Shreyansh, I saw your LLD video for vending machine where we are using State design pattern, in that you have mentioned if the system has states we should use state pattern, can't we use the same pattern here? Also can you please upload a video on difference between State vs Strategy vs Command design pattern?

Hi there, i am final year undergrad preping for placements , can someone please tell what is expected in design rounds, i mean is it solely focused on LLD or HLD or both (for fresher roles)

what about set temparature command, or where user input is needed. how to handle these commnads ?

Thanks for the video.

Great work👍👍👍

sir whats the role of invoker apart from applying undo feature like if we don't want undo feature then client already has reference to command and the receiver so client can directly call commands execute method and still there is no tight coupling between client and receiver plz reply sir

Note not there give link not working 😢

This is similar like strategy design pattern

Are you still adding videos to this playlist? or this will be till here only?

Awesome ❤

The notebook URL from the description is not working.

17:54 client still has to know about all the commads it can perform i do not think this pattern makes any sense or maybe the example is not good

Notes Link Not Working

Bhai keerthi ko bolo course mein ye example daaldein

Command Pattern is the stupidest design pattern i have seen so far.