Hi guys, this one keeps coming regularly for me
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# announcementsj
Jiddles
07/19/2018, 2:03 PMHi guys, this one keeps coming regularly for me
Is there a nice way of dealing with this ? I saw the SO about it but wasn’t great.
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// The below code results in a compilation error
data class ViewModel(
var lineSpeed: Int? = null
)
val viewModel = ViewModel()
if(viewModel.lineSpeed != null && viewModel?.lineSpeed > 0 ) {}
//Error : Smart cast to 'Int' is impossible, because 'viewModel.lineSpeed' is a mutable property that could have been changed by this timel
Lucas Ł
07/19/2018, 2:08 PMeither set a default value, use a constructor or use
!!Lucas Ł
07/19/2018, 2:10 PMor
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viewModel.lineSpeed?.let{
if(it>0) ....
}a
arekolek
07/19/2018, 2:10 PMor
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viewModel.lineSpeed?.takeIf { it > 0 }?.let {
}👍 2
s
Sam Woodall
07/19/2018, 2:12 PM Copy code
fun Int?.isGreaterThan(a: Int) = this != null && this > a
if (viewModel.lineSpeed.isGreaterThan(3)) {
}😵 1
r
robstoll
07/19/2018, 2:28 PMI usually use a local variable
👍 4
j
Jiddles
07/19/2018, 3:27 PMThanks for all the replies guys, plenty to choose from
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