Add Scala3 to trial

radar/2021-01-01/scala3.md

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+---
+title: "Scala 3"
+ring: "trial"
+quadrant: "languages-and-frameworks"
+featured: true
+---
+
+[Scala 3](https://docs.scala-lang.org/scala3/) is the successor of the Scala 2.x 
+series programming language.
+
+It's not just a small iteration on Scala 2 but a complete overhaul of the 
+language trying to improve in several areas like:
+* Syntax
+  * "quiet" syntax for control structures like `if`, `while` and `for`
+  * optional `new` operator
+  * Optional braces with significant-indentation syntax like in python
+  * Completely revised `implicit`s - see below
+* Contextual Abstractions focusing on intent instead of mechanics
+  * Abstracting over contextual information with `using`
+  * Providing type-class instances via `given`
+  * direct extension method syntax `extension (s: String) def pirate: String = s"$s arr!"`
+* Type System improvements
+  * `enum`s 
+  * opaque types
+  * intersection and union types
+  * dependent function types
+  * polymorphic function types
+  * type lambdas
+  * match types
+* Improvements for object oriented design
+* Completely new metaprogramming facilities while Scala 2 macros were removed
+
+Even with these big changes Scala 3 provides a great compatibility story supporting 
+Scala >2.13.5 libraries in Scala 3 projects and vice versa.
+
+Although slowly we will update our existing Scala 2 codebase to Scala 3 over the 
+next months and years to take advantage of the improvements made.