page = kotlin programming language

url = https://kotlinlang.org analysed @ 2021-04-23 14:03 UTC

Concise
Safe
Interoperable
/* 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" }
/*
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"
/* 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() }
/* 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!" }
// Target either the JVM or JavaScript. Write code in Kotlin and decide where you want to deploy to