By Stephen Samuel

Familiarize your self with all of Kotlin's gains with this in-depth guide

About This Book

  • Get a radical advent to Kotlin
  • Learn to exploit Java code along Kotlin with none hiccups
  • Get an entire evaluate of null protection, Generics, and lots of extra attention-grabbing features

Who This ebook Is For

The publication is for latest Java builders who are looking to research extra approximately an alternate JVM language. so as to see what Kotlin has to supply, this booklet is perfect for you.

What you'll Learn

  • Use new positive factors to put in writing dependent and readable object-oriented code
  • Find out how one can use lambdas and better order features to put in writing fresh, reusable, and easy code
  • Write unit assessments and combine Kotlin assessments with Java code in a transitioning code base
  • Write real-world construction code in Kotlin within the variety of microservices
  • Leverage Kotlin's extensions to the Java collections library
  • Use destructuring expressions and tips to write your own
  • Write code that avoids null pointer error and notice how Java-nullable code can combine with good points in a Kotlin codebase
  • Discover find out how to write features in Kotlin, see the recent good points to be had, and expand latest libraries
  • Learn to write down an algebraic info varieties and determine once they might be used

In Detail

Kotlin has been making waves ever because it was once open sourced via JetBrains in 2011; it's been praised by way of builders the world over and is already being followed by means of businesses. This booklet presents an in depth advent to Kotlin that exhibits you all its positive factors and may provide help to write Kotlin code to production.

We commence with the fundamentals: get you acquainted with operating Kotlin code, establishing, instruments, and directions so you might use to jot down simple courses. subsequent, we conceal item orientated code: features, lambdas, and homes - all whereas utilizing Kotlin's new features.

Then, we circulation directly to null security points and sort parameterization. We enable you destructure expressions or even write your personal. We additionally take you thru vital themes like trying out, concurrency, microservices, and an entire lot extra. through the tip of this publication it is possible for you to to compose assorted companies and construct your personal applications.

Style and approach

An effortless to keep on with advisor that covers the whole set of good points in Kotlin programming.

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Extra resources for Programming Kotlin

Sample text

For those coming from a Java background, this chapter will highlight some of the key similarities and differences between Kotlin and Java, and how Kotlin's language features compare to those in Java and on the JVM. For those who are not Java programmers, these differences can be safely skipped. In this chapter we will cover the following topics: Variables and values Control flow and expressions Type inference Smart casting Basic types and the Kotlin type hierarchy Vals and vars Kotlin has two keywords for declaring variables, val and var.

If this was a checked exception, literally every function would need to declare it! In Kotlin, since all exceptions are unchecked, they never form part of function signatures. The handling of an exception is identical to Java, with the use of try, catch, and finally blocks. Code that you wish to handle safely can be wrapped in a try block. Zero or more catch blocks can be added to handle different exceptions, and a finally block is always executed regardless of whether an exception was generated or not.

Name}") This is not ready yet. While compiling will go well, trying to execute the JAR will yield an error at runtime about the Student class not being found. The Java compiler needs to know about the Java code sitting under the kotlin folder. basedir}/src/main/kotlin Finally, we are in a position to compile and run the code. jar Summary This chapter has showed you how you can set up your development environment with the tools required to build and run Kotlin code.

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