To get the most out of this book

1. Readers are expected to have some knowledge of Scala, SBT, and the IntelliJ IDEA or any IDE usage. Familiarity with at least one web application development framework will make learning another web framework easy.
2. Readers should have Java 8, SBT, IntelliJ IDEA, and Scala in their local systems.

Download the example code files

You can download the example code files for this book from your account at www.packtpub.com. If you purchased this book elsewhere, you can visit www.packtpub.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packtpub.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Scala-Reactive-Programming. In case there's an update to the code, it will be updated on the existing GitHub repository.

For more useful information and examples you can visit the following repository:

• https://github.com/rposa-srp-book/srp-book-examples

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://www.packtpub.com/sites/default/files/downloads/ScalaReactiveProgramming_ColorImages.pdf.

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: " The map() function does not give us the expected results, so we only use flatMap() function."

A block of code is set as follows:

    object HelloWorldApp extends App{ 
      println("Hello Scala World!") 
    }

Any command-line input or output is written as follows:

  For comprehension addition output: Some(Success(30))
  Scala Future API addition output: Some(Success(30))
  Scala Async API addition output: Some(Success(30))

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Go to Configure at the bottom right and click on the Plugins option available in the drop-down."

Warnings or important notes appear like this.

Tips and tricks appear like this.