If you are a beginner, begin this book with an open mind and a drive to learn. You may find the task of learning a new language daunting at first, but with perseverance, you will be a professional in no time. Read through each chapter in the order they are presented in. This will ensure you grasp all of the content within the book. Take special care to read through each code snippet so as to fully understand what is being done. Implement and run each program in this book yourself.

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/Kotlin-Programming-By-Example. In case there's 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/KotlinProgrammingByExample_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: "In Java, an HttpsURLConnection can be used for secure data transfer over a network."

A block of code is set as follows:

release {
  storeFile file("../my-release-key.jks")
  storePassword "password"
  keyAlias "my-alias"
  keyPassword "password"
}

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

release {
  storeFile file("../my-release-key.jks")
  storePassword "password"
  keyAlias "my-alias"
  keyPassword "password"
}

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

./gradlew assembleRelease

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: "Enter the rest of your account details as required and click COMPLETE REGISTRATION to finish the account registration process."