Programming Scala: Scalability = Functional Programming + by Dean Wampler, Alex Payne

By Dean Wampler, Alex Payne

Wake up to hurry on Scala, the JVM language that gives the entire advantages of a contemporary item version, sensible programming, and a complicated style process. full of code examples, this accomplished booklet exhibits you the way to be effective with the language and atmosphere instantaneously, and explains why Scala is perfect for today's hugely scalable, data-centric functions that help concurrency and distribution.

This moment version covers fresh language positive factors, with new chapters on development matching, comprehensions, and complicated useful programming. You’ll additionally know about Scala’s command-line instruments, third-party instruments, libraries, and language-aware plugins for editors and IDEs. This publication is perfect for starting and complex Scala builders alike.

software swifter with Scala’s succinct and versatile syntax
Dive into simple and complex useful programming (FP) techniques
construct killer big-data apps, utilizing Scala’s sensible combinators
Use characteristics for mixin composition and development matching for information extraction
research the subtle variety procedure that mixes FP and object-oriented programming concepts
discover Scala-specific concurrency instruments, together with Akka
know how to improve wealthy domain-specific languages
study reliable layout thoughts for construction scalable and strong Scala purposes

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Additional info for Programming Scala: Scalability = Functional Programming + Objects (2nd Edition)

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ToString}") // } case class Circle(center: Point, radius: Double) extends Shape // case class Rectangle(lowerLeft: Point, height: Double, width: Double) // extends Shape case class Triangle(point1: Point, point2: Point, point3: Point) extends Shape // Declare a class for two-dimensional points. Declare an abstract class for geometric shapes. Implement a draw method for “rendering” the shapes. We just write a formatted string. A circle with a center and radius. A rectangle with a lower-left point, height, and width.

So now you have a taste of actor-based concurrency and a few more powerful Scala features. Recap and What’s Next We introduced Scala, then dove into some nontrivial Scala code, including a taste of Akka’s actor library for concurrency. org. You will find links for libraries, tutorials, and various papers that describe features of the language. Typesafe, Inc. is the commercial company that supports Scala and several JVM-based development tools and frameworks, including Akka, Play, and others. You’ll find many useful resources on the company’s website.

Let’s break down the details of receive: def receive = { case s: Shape => ... case Exit => ... case unexpected => ... } // // // If the message is a Shape instance, the first case clause matches. , s will be of type Shape, while the input message has the type Any. The message equals Exit. This will be a signal that we’re done. This is the “default” clause that matches anything. It is equivalent to unexpec ted: Any, so it matches anything passed in that didn’t match the preceding pattern matches.

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