Why Scala?

It runs on the JVM

People who like the JVM agree that the JVM is a good platform to run on.

Managers accept it

• https://www.slideshare.net/Odersky/scala-days-san-francisco-45917092

Pretty good type system

In general, type systems have various goals:

• Minimise the number of incorrect programs which can be written
• Maximise the number of correct programs which can be written
• Assist the compiler in producing fast output
• Give early feedback to the developer
• Guide the developer towards a solution

In particular, Scala's type system lets you represent some things not representable in other mainstream type systems, e.g.

trait Functor[F[_]] {
  def map[A, B](fa: F[A])(f: A => B): F[B]
}

The F is not representable in Java.