i.
What You Need
To follow along with this book, you need:
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IntelliJ IDEA Community Edition 2021.1.x: Available at https://www.jetbrains.com/idea/. This is the environment in which you’ll develop most of the sample code in this book.
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Kotlin Playground: You can also use the Kotlin Playground available at the Kotlin home page at https://play.kotlinlang.org.
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ii.
Book Source Code & Forums