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Try out the latest Kotlin features before they are released
fun main() { println("Hello World") }
class Greeter(val name: String) { fun greet() { println("Hello, $name") } } fun main(args: Array<String>) { Greeter(args[0]).greet() }
import kotlinx.coroutines.* //sampleStart suspend fun main() = coroutineScope { for (i in 0 until 10) { launch { delay(1000L - i * 10) print("$i ") } } } //sampleEnd
Drastically reduce the amount of boilerplate code
/*
Create a POJO with getters, setters, `equals()`, `hashCode()`, `toString()` and `copy()` in a single line:
*/
data class Customer(val name: String, val email: String, val company: String)
// Or filter a list using a lambda expression:
val positiveNumbers = list.filter { it > 0 }
// Want a singleton? Create an object:
object ThisIsASingleton {
val companyName: String = "JetBrains"
}
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/*
Get rid of those pesky NullPointerExceptions, you know, The Billion Dollar Mistake
*/
var output: String
output = null // Compilation error
// Kotlin protects you from mistakenly operating on nullable types
val name: String? = null // Nullable type
println(name.length()) // Compilation error
// And if you check a type is right, the compiler will auto-cast it for you
fun calculateTotal(obj: Any) {
if (obj is Invoice)
obj.calculateTotal()
}
Leverage existing libraries for the JVM, Android, and the browser
/*
Use any existing library on the JVM, as there’s 100% compatibility, including SAM support.
*/
import io.reactivex.Flowable
import io.reactivex.schedulers.Schedulers
Flowable
.fromCallable {
Thread.sleep(1000) // imitate expensive computation
"Done"
}
.subscribeOn(Schedulers.io())
.observeOn(Schedulers.single())
.subscribe(::println, Throwable::printStackTrace)
// Target either the JVM or JavaScript. Write code in Kotlin and decide where you want to deploy to
import kotlin.browser.window
fun onLoad() {
window.document.body!!.innerHTML += "<br/>Hello, Kotlin!"
}
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Bundled with Android Studio
Install the plugin from the Eclipse Marketplace
Use any editor and build from the command line