Object-Oriented Programming - it is often synonymous with Java Development. But what if I were to tell you that there is more to Java than OOP principles?

Starting JDK8, Java language introduced a new and exciting world of Functional Programming. This inherently powerful paradigm drives services like AWS Lambda, Azure Functions, or any other Function as a Service product out there.

Functional programming offers better security, simpler maintenance, and more flexible design, so it is vital for Java developers to embrace this paradigm and learn how to use it well.

In this talk, we discuss how to apply Functional programming in Java with the primary focus on Functional Interfaces. We explore out-of-the-box Functional structures, how to build custom Functions and look at common mistakes of impure abstractions and overly-DRY design.