language.md

Data class return

fun test(a: Int): (text: String, calc: double) { ("some string", 5.0) }

implementation

data class testResult(val text: String, val calc: double)

fun test(a: Int): testResult { testResult("some string", 5.0) }

Destructuring

data class Person(firstname: String, lastname: String, age: Int) val p = Person("John", "Smith", 30) val Person(firstname, _) = p

// val firstname = p._1

Pattern matching

when (p) { Person(_, _, 1) -> "Person is one" Person(f, "Smith", ) -> "Person has common last name, but firstname is $f" Person(, , _ >= 10 && _ < 18) -> "Person is over 10 but below 18" Person(, _, a >= 18) -> "Person is adult and $a years old" }

implementation

when (p) { p is Person && p._3 == 1 -> "Person is one" p is Person && (val f = p._1; true) && p._2 == "Smith") -> "Person has common last name, but firstname is $f" p is Person && (p._3 >= 10 && p._3 < 18) -> "Person is over 10 but below 18" p is Person && (val a = p._3; a >= 18) -> "Person is adult and $a years old" }