On the Java skills required to learn Kotlin

Kotlin as a first programming language

public class Something {
public static void main(String[] args) {
for (int i = 0; i < 5; i++) {
System.out.println(“Hello, world! “ + i);
}
}
}
fun main(args: Array<String>) {
for (i in 0..4)
println(“Hello, World! $i”)
}
data class Book(
val title: String,
val authors: List<String>,
val isbn: String,
val publishingYear: Int)

Immutable natives

Kotlin for mediocre Java developers

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