Feel like I'm missing something basic. Anyone know why this doesn't compile? ```var myCount by reme...

# compose

[Colton Idle]

Feel like I'm missing something basic. Anyone know why this doesn't compile?

var myCount by remember { mutableStateOf(0) }
val shouldDisplay = remember { derivedStateOf { (myCount > 1) } }

[Mitchell Skaggs]

Make sure you have all the imports. There are a lot of extension functions required for the functionality. Intellij can help add imports automatically.

[Tash]

Seems to work… what error are you getting?

[Tash]

Yea, make sure to have these imports:

import androidx.compose.runtime.derivedStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.getValue
import androidx.compose.runtime.setValue

[Colton Idle]

All of my following composable fail after I add that line. Let me check the imports.

[Tash]

Seems to work ok…yea might be something to do with your env/file?

[Colton Idle]

If I comment out that line then it works again.

[Tash]

What does the error say on AS ? (when you hover over OutlineTextField)

[Colton Idle]

Restarting android studio did the trick. 😭

[Colton Idle]

Thank you everyone for checking my sanity.

[hfhbd]

Stupid question, is this approach preferred over a function/custom getter?

[Tash]

Do you mean regarding usage of derivedStateOf ?

[hfhbd]

yes

[Mitchell Skaggs]

Yes, derivedStateOf allows the Compose runtime to understand dependent functions and only recompute values if necessary.

[hfhbd]

Good to know