derivedStateOf VS. remember(key) - THIS is Really the Difference 🤯

This video will show you the difference of derivedStateOf VS. remember(key).
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[@stanleykou5643]

Your "20 things you should never do in Jetpack Compose" PDF was super useful. Jetpack compose is full of traps, and your tip is like a mine detector!

[@ErnestoVega]

How did you get it, please? I already got subscribed to the newsletter but I can't find nor get it anywhere.

[@lr56c60]

Could you temporarily upload it to a cloud? I haven't been able to click the button for several weeks. I have tried different internet providers and devices. Thanks

[@pelealexandru]

I want it as well. Where do we get it?

[@lr56c60]

@@pelealexandru did you try phillip's page? I am asking here because the button to obtain the pdf on his page does not work for me.

[@pelealexandru]

yes just tried it 10 minutes ago but didn't get the pdf @@lr56c60

[@Alchemist10241]

7:41 the best explanation I've ever heard or read that clarifies the use case of these two function, well done Philipp 👍

[@AdrianTache]

Compose always feels like such an unfinished project... I'd expect `remember` to handle all these kinds of edge cases under the hood and prevent recompositions as needed, rather than requiring all these clumsy hacks to either prevent or force recompositions, depending on the situation. Having said that, thanks for the video, it's a nice summary of these issues and how to solve them!

[@ChrisAthanas]

The documentation is improving slowly and compose is definitely an improvement over the xml madness

[@AdrianTache]

@@ChrisAthanas not sure I entirely agree, Compose just hides away a lot of what is still happening to views, turning annoying issues into hidden annoying issues. I'm still a fan, primarily because we're finally getting rid of states inside views (with some horrific exceptions, like how that stupid text selection can STILL crash your app because it get stuck in the wrong state sometimes), but it's probably going to be years until it's actually at a comparable level of stability with xml.

[@callebdev]

Thanks a lot Philipp. I was also struggling to understand the difference between both of them. Your explanation was literally amazing! 💯

[@solokiller5883]

I always watch your videos because they are very helpful and moreover you break things down in a clear and easy way, your pdf is amazing

[@chorvico]

Awesome explanation! Thanks for sharing this!

[@AdevAxmeddev]

Thanks a lot Philipp Lackner. It is amazing...!

[@LasradoRohan]

You are reading my mind at this point

[@PhilippLackner]

You're welcome

[@mbpiku]

This was really insightful, thanks 🙏

[@alexeysimchenko7494]

I knew that case but always is good to repeat) And I found out from this video that derivedStateOf is not updated if argument is updated and I need to pass such agrument as a key to remember. Thanks for mentioning that

[@-ECE-SOGATAKAR]

Thanks you are doing great job ❤

[@mortezamgh1347]

Thanks dear Philipp, very useful tutorial 👍

[@tarsilacostalonga]

You are the best!!

[@SSG1239]

Hey Philipp, can you please make a video regarding content driven concepts & if possible some mini projects that will be a great help.

[@user-lr1qk5gz3i]

Without bias, if you were to choose between compose or views, which one would you use in your project? For a better performance.

[@stewie2k519]

Hey, I've watched your video about Content Providers. I am currently working with one of them - Calendar Provider, developing a small calendar-app. Do you have any other videos on this topic or maybee you can reccomend some other sources where I can read/watch about this specific provider? Espicially about syncing calendars from local storage to a server and vice-versa. And another thing is - is there some library that provides a CalendarView like Google Calendar have (the monthly view grid with displayiing event's preview(titles) in each cell)? Thanks😅

[@mustafaammar551]

Thank you BRO

[@pelealexandru]

Thanks!

[@henrik908]

No doubt why he is the king of Jetpack compose.

[@mahiainti678]

at 12:03 if my understanding is correct you can alternatively explicitly pass isEnabledState as a state into derivedStateOf and not set keys in remember. In this way derivedStateOf would monitor both of the states inside of it. I.e. `derivedStateOf { state.firstVisibleItemIndex >= 5 && isEnabledState.value }`

[@muhmmedalsadig7706]

I agree 👍

[@abiodunmoses2638]

If you are going to pass state as a parameter, how are you supposed to change its value ?

[@mahiainti678]

@@abiodunmoses2638 just the usual way? state.value = newValue somewhere else

[@jackeblan]

It's better to put the isEnabled to if(showScrollToTopButton && isEnable)

[@user-wt9vk2xo6v]

@@abiodunmoses2638 add another onValueChange callback

[@varunagrawal5802]

U saved, thanks

[@purplehazer417]

Phillip, can you explain the difference between rememberUpdatedState(key) and remember(key) { mutableStateOf(key) }

[@raulprior9635]

Amazing

[@ubersticks]

How do I get the PDF? I am already a subscriber and the link seems to be only for new subscribers.

[@user-lx7fq2lw8j]

Sir i am learning jetpack compose to become android developer .Do i need to learn DSA to become android developer. Because at college placements we required DSA is it necessary

[@WakeupDev.]

Vivid and helpful

[@amol1608]

hey Philipp, the subscription for the free PDF is not working. I tried with one mail, never got a link. I tried with another mail (that was never subscribed), got a link, but the link from the email doesn't work, I get a 404.

[@mark-147]

How about if you put the >=5 inside the remember arg?

[@fliamachado]

Same question! I've that a loot, where the key is a boolean condition.

[@neerajverma9226]

Can you explain out and in generics here? RequestState {}

[@Revakovskyi]

Thanks so much! You're the best!

[@utkubilgin2818]

Hi, I couldn't download the PDF

[@vitdemidenko]

val state by)))))))

[@5erTurbo]

4:30 I guess you could still do following and it would work same as using `derivedStateOf`? `remember(state.firstVisibleItemIndex >= 5)`