To get the most out of this book

In order to learn from the book efficiently, you should follow the included recipes step by step and try to implement the solutions on your own. You can download the sample code from the book's GitHub repository at https://github.com/PacktPublishing/Kotlin-Standard-Library-Cookbook and import it into IntelliJ IDEA and Android Studio. If you have any trouble, you can run and test each recipe instantly in the IDE.

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/Kotlin-Standard-Library-Cookbook. 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!

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: "We can do so with the extension function provided for the IntProgression, LongProgression, and CharProgression types, which is called reversed()."

A block of code is set as follows:

val daysOfYear: IntRange = 1..365
for(day in daysOfYear.reversed()) {
    println("Remaining days: $day")
}

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

val sequence = sequenceOf("a", "b", "c", "d", "e", "f", "g", "h")
val transformedSequence = sequence.map {
    println("Applying map function for $it")
    it
}

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

[10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]

Bold: Indicates a new term, an important word, or words that you see onscreen.

Warnings or important notes appear like this.

Tips and tricks appear like this.