By Bedrytski, Aliaksandr; Bogucki, Janek; Detrich, Matthew de; Lacava, Alessandro; Neil, Benjamin

ISBN-10: 1119267226

ISBN-13: 9781119267225

ISBN-10: 1119267250

ISBN-13: 9781119267256

ISBN-10: 1119267269

ISBN-13: 9781119267263

ISBN-10: 1119281318

ISBN-13: 9781119281313

Professional Scala presents skilled programmers with quickly song assurance geared toward assisting using Scala in specialist construction purposes. Skipping over the fundamentals and basics of programming, the dialogue launches without delay into functional Scala themes with the main up to date assurance of the rapidly-expanding language and similar instruments. Scala bridges the distance among useful and object-oriented programming, and this publication information that hyperlink with transparent a dialogue on either Java compatibility and the read-eval-print loop utilized in practical programming. you will study the main points of tooling for construct and static research. You’ll hide unit trying out with ScalaTest, documentation with Scaladoc, how to address concurrency, and masses extra as you construct the in-demand ability set required to take advantage of Scala in a real-world creation environment.

Java-compliant with useful programming homes, Scala's attractiveness is turning out to be quickly—especially within the speedily increasing components of massive facts and cluster computing. This ebook explains every little thing specialist programmers have to commence utilizing Scala and its major instruments fast and effectively.

 Master Scala syntax, the SBT interactive construct software, and the REPL workflow

  • Explore sensible layout styles, concurrency, and testing
  • Work successfully with Maven, Scaladoc, Scala.js, and more
  • Dive into the complex style system
  • Find out approximately Scala.js

A operating wisdom of Scala places you prominent. As either the language and purposes extend, so do the possibilities for skilled Scala programmers—and many positions are going unfilled. Twitter, Comcast, Netflix, and different significant businesses throughout industries are utilizing Scala each day, in a couple of diversified functions and capacities. Professional Scala is helping you replace your talents quick to begin advancing your career.

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CORE COLLECTION METHODS Collections, including sequences, sets, and maps, may be considered one of the most used data structure in programming languages. In fact, some languages are entirely constructed from lists and primitives; just look at Lisp! Functional programming languages contain quite a number of collection methods, so it is important to know them. In imperative languages you are used to dealing with collections using loops. indd 05/12/2016 Page 27 28 ❘ CHAPTER 2 FUNCTIONAL PROGRAMMING A common pattern is to take an element from one array, transform it, and insert it into another.

It covers how Scala traits relate to Java interfaces, and details how both things can cooperate. Java enums are then mapped into the Scala world. You’ll see that, in Scala, you have more than one alternative. SCALA AND JAVA COLLECTIONS Collections are probably one of the more used APIs, both in Scala and Java. When interoperating with a Java library it’s important to know how you can go from a Java collection to a Scala one and back again. collection package, there are two objects that can be used for this purpose, namely JavaConversions and JavaConverters.

As a result, you have a list of words that is then “flattened” into a single concatenated list of words. If you already have a collection of collections as a value, you may flatten it without any flatMap. flatten The distinct method takes no parameters and returns a collection of the same type without repetitions. toSet) // prints Set(Alex, Sam) The groupBy() method is handy when working with a collection of structures that have a unique identifier each. identifier) /* likesByUser contains: Map( Alex -> List(User2(Alex,Kiwi), User2(Alex,Apple)), Sam -> List(User2(Sam,Banana)) )*/ The partition() method is not used very often, but it is nice to know that it exists.

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Professional Scala by Bedrytski, Aliaksandr; Bogucki, Janek; Detrich, Matthew de; Lacava, Alessandro; Neil, Benjamin

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