Basic knowledge of any programming language would be helpful to you during the course of this book. Additional knowledge of Java would also be useful for understanding some concepts covered in this book. There are several levels of involvement to make the most of this book, from the quickest to the most effective:

• You can just read it and look at the code in your IDE.
• While you read it, you can copy and paste the code samples in your IDE and run them.
• Same as before, but this time you re-type all the code samples. Using the auto-completion will make you discover more functions of the API. Typing the code will also make you remember it more. You make use of your visual and kinesthetic memory.
• The Benjamin Franklin method. You read a whole chapter or a section in one go, then close the book. After that, try to re-write the code samples from memory. If you are stuck you can reopen the book. This will force your brain to have a complete picture of a project. You will memorize and understand the concepts in much more depth.
  

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packt.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.packt.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-Programming-Projects. In case there is an update to the code, it will be updated on the existing GitHub repository.

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

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/9781788397643_ColorImages.pdf.

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: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."

A block of code is set as follows:

class LazyDemo {
  lazy val lazyVal = {
    println("Evaluating lazyVal")

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

def lazyEvenPlusOne(xs: Vector[Int]): Vector[Int] =
  xs.withFilter { x => println(s"filter $x"); x % 2 == 0 }

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

$ mkdir css
$ cd css

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: "Select System info from the Administration panel."