Scala is an open source programming language created in 2004 by Martin Odersky.
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Scala ( SKAH-lah) is a general-purpose programming language providing support for functional programming and a strong static type system. Designed to be concise, many of Scala's design decisions aimed to address criticisms of Java. Scala source code is intended to be compiled to Java bytecode, so that the resulting executable code runs on a Java virtual machine. Read more on Wikipedia...
// Type your code here, or load an example.
object Square {
def square(num: Int): Int =
num * num
}
println("Hello, world!")
object HelloWorld extends App {
println("Hello World")
}
// Hello world in Scala
object HelloWorld extends App {
println("Hello world!")
}#!/bin/sh
exec scala "$0" "$@"
!#
object HelloWorld {
def main(args: Array[String]) {
println("Hello, world!")
}
}
val urls = List("http://scala-lang.org", "https://github.com/scala/scala")
def fromURL(url: String) = scala.io.Source.fromURL(url)
.getLines().mkString("\n")
val t = System.currentTimeMillis()
urls.par.map(fromURL(_))
println("time: " + (System.currentTimeMillis - t) + "ms")abstract case catch class def do else extends false final finally for forSome if implicit import lazy match new null object override package private protected return sealed super this throw trait try true type val var while with yield| Feature | Supported | Token | Example |
|---|---|---|---|
| Conditionals | ✓ | ||
| Inheritance | ✓ | ||
| Functions | ✓ | ||
| Exceptions | ✓ | ||
| Classes | ✓ | ||
| While Loops | ✓ | ||
| Booleans | ✓ | true false | |
| MultiLine Comments | ✓ | /* */ | /* A comment */ |
| Print() Debugging | ✓ | println | |
| Message Passing | ✓ | ||
| Line Comments | ✓ | // | // A comment |
| Type Inference | ✓ | ||
| Operator Overloading | ✓ | ||
| Implicit Arguments | ✓ | // https://docs.scala-lang.org/tour/implicit-parameters.html
abstract class Monoid[A] {
def add(x: A, y: A): A
def unit: A
}
object ImplicitTest {
implicit val stringMonoid: Monoid[String] = new Monoid[String] {
def add(x: String, y: String): String = x concat y
def unit: String = ""
}
implicit val intMonoid: Monoid[Int] = new Monoid[Int] {
def add(x: Int, y: Int): Int = x + y
def unit: Int = 0
}
def sum[A](xs: List[A])(implicit m: Monoid[A]): A =
if (xs.isEmpty) m.unit
else m.add(xs.head, sum(xs.tail))
def main(args: Array[String]): Unit = {
println(sum(List(1, 2, 3))) // uses intMonoid implicitly
println(sum(List("a", "b", "c"))) // uses stringMonoid implicitly
}
} |
|
| Macros | ✓ | // https://docs.scala-lang.org/scala3/guides/macros/macros.html import scala.quoted.* // imports Quotes, Expr def inspectCode(x: Expr[Any])(using Quotes): Expr[Any] = println(x.show) x |
|
| Comments | ✓ | ||
| Partial Application | ✓ | def add(x: Int, y: Int) = {x+y}; add(1, _: Int) |
|
| Strings | ✓ | " | "hello world" |
| Case Insensitive Identifiers | X | ||
| Semantic Indentation | X |