I've recommended this book in the past, and I'll recommend it again. Functional Programming in Scala [1] does a good job of taking traditional stateful object o

I've recommended this book in the past, and I'll recommend it again. Functional Programming in Scala [1] does a good job of taking traditional stateful object oriented code and refactoring it using pure functional approaches. Coming from an OOP background, I've found it has really helped my understanding of functional programming. [1] https://www.manning.com/books/functional-programming-in-scala https://www.manning.com/books/functional-programming-in-scal...