Use Kotlin to build Android apps, web applications, and more-while you learn the nuances of this popular language. With this unique cookbook, developers will learn how to apply this Java-based language to their own projects. Both experienced programmers and those new to Kotlin will benefit from the practical recipes in this book.Author Ken Kousen (Modern Java Recipes) shows you how to solve problems with Kotlin by concentrating on your own use cases rather than on basic syntax. You provide the context and this book supplies the answers. Already big in Android development, Kotlin can be used anywhere Java is applied, as well as for iOS development, native applications, JavaScript generation, and more. Jump in and build meaningful projects with Kotlin today.Apply functional programming concepts, including lambdas, sequences, and concurrencySee how to use delegates, late initialization, and scope functionsExplore Java interoperability and access Java libraries using KotlinAdd your own extension functionsUse helpful libraries such as JUnit 5Get practical advice for working with specific frameworks, like Android and Spring.About the AuthorKen Kousen is a Java Champion and Oracle Developer Champion, and the author of the books Modern Java Recipes (O'Reilly), Gradle Recipes for Android (O’Reilly) and Making Java Groovy (Manning), as well as O’Reilly video courses in Android, Groovy, Gradle, Advanced Java, and Spring. He is a regular speaker on the No Fluff, Just Stuff conference tour and a JavaOne Rock Star and Grails Rock Star. He has spoken at conferences all over the world. Through his company, Kousen I.T., Inc., he has taught software development training courses to thousands of students.