Build applications quicker and with less effort using functional programming and Kotlin. Learn
by building a complete application from gathering requirements to delivering a microservice
architecture following functional programming principles. Learn how to implement CQRS and
EventSourcing in a functional way to map the domain into code better and to keep the cost of
change low for the whole application life cycle. If you're curious about functional programming
or you are struggling with how to put it into practice this guide will help you increase your
productivity composing small functions together instead of creating fat objects. Switching to
the functional paradigm isn't easy when you're used to object-oriented programming. You need
more than just lambdas and mapping over collections to get a declarative style and disentangle
the state from the computations. Use transformations and compositions to help you write less
code with better results. Boost your productivity and harness the power of functional
programming by creating real-world applications rather than focusing on theoretical concepts.
Work through a series of short exercises to find and compose pure functions and create data
structures that work like algebra. Get rid of mutable state in your software to eliminate the
main source of bugs. Apply CQRS and EventSourcing patterns to translate stakeholder
requirements into functional design and then into code. See how Kotlin's easy-to-learn syntax
and functional-friendly approach make it a great option for a pragmatic language that
integrates well with existing Java code and libraries. Leverage functional programming to build
and deliver robust applications in less time and with fewer defects. What You Need: The code in
this book is designed to allow you to build your application from scratch on Windows Mac and
Linux. You will need a recent IDE we recommend IntelliJ Community Edition and Kotlin 1.3.x or
later.
