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kotlinlang

Hi 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.
```
// The below code results in a compilation error
data class ViewModel(
    var lineSpeed: Int? = null
)

val viewModel = ViewModel()

if(viewModel.lineSpeed != null &amp;&amp; viewModel?.lineSpeed &gt; 0 ) {}

//Error : Smart cast to 'Int' is impossible, because 'viewModel.lineSpeed' is a mutable property that could have been changed by this time
```

either set a default value, use a constructor or use `!!` when accessing the (mutable/nullable) variable

or
```
viewModel.lineSpeed?.let{
    if(it&gt;0) ....
}
```

or
```
viewModel.lineSpeed?.takeIf { it &gt; 0 }?.let {

}
```

```fun Int?.isGreaterThan(a: Int) = this != null &amp;&amp; this &gt; a

if (viewModel.lineSpeed.isGreaterThan(3)) {

}```

Thanks for all the replies guys, plenty to choose from