Kotlin doesn’t have raw types, you cannot just drop the type parameters. One option similar to raw types is to use star projections: abstract class Element<S : Snapshot<*>> { /* … */ } abstract class Snapshot<E : Element<*>> { /* … */ } But you won’t be able to normally work with the type parameters … Read more
After spending almost a full year of writing Kotlin daily I’ve found that attempting to override data classes like this is a bad practice. There are 3 valid approaches to this, and after I present them, I’ll explain why the approach other answers have suggested is bad. Have your business logic that creates the data … Read more
For a data class, you can use the compiler-generated copy() method. Note that it will perform a shallow copy. To create a copy of a collection, use the toList() or toSet() methods, depending on the collection type you need. These methods always create a new copy of a collection; they also perform a shallow copy. … Read more
Array<Int> is an Integer[] under the hood, while IntArray is an int[]. That’s it. This means that when you put an Int in an Array<Int>, it will always be boxed (specifically, with an Integer.valueOf() call). In the case of IntArray, no boxing will occur, because it translates to a Java primitive array. Other than the … Read more
The warning is about methods that block current thread and coroutine cannot be properly suspended. This way, you lose all benefits of coroutines and downgrade to one job per thread again. Each case should be handled in a different way. For suspendable http calls you can use ktor http client. But sometimes there is no … Read more
It’s a feature of Compose about scoping and smart recomposition. You can check my detailed answer here. What really makes your whole Composable to recompose is Column having inline keyword. @Composable inline fun Column( modifier: Modifier = Modifier, verticalArrangement: Arrangement.Vertical = Arrangement.Top, horizontalAlignment: Alignment.Horizontal = Alignment.Start, content: @Composable ColumnScope.() -> Unit ) { val measurePolicy … Read more
It’s because is is a reserved keyword in Kotlin. Since Kotlin is supposed to be interoperable with Java and is is a valid method (identifier) name in Java, the backticks are used to escape the method so that it can be used as a method without confusing it as a keyword. Without it it will … Read more
Getters and setters are auto-generated in Kotlin. If you write: val isEmpty: Boolean It is equal to the following Java code: private final Boolean isEmpty; public Boolean isEmpty() { return isEmpty; } In your case the private access modifier is redundant – isEmpty is private by default and can be accessed only by a getter. … Read more
You should scope your concurrency appropriately using structured concurrency. Your coroutines can leak if you don’t do this. In your case, scoping them to the processing of a single message seems appropriate. Here’s an example: /* I don’t know Kafka, but let’s pretend this function gets * called when you receive a new message */ … Read more
I was able to scrape what you were looking for from this page on that same site. Even if it’s not what you want, the procedure may help someone in the future. Here is how I did that: First I opened that page Then I opened the Chrome developer tools by pressing CTRL+ SHIFT+i or … Read more