Part 1 Benefits of functional programming applicable to concurrent programs

Functional programming is a programming paradigm that focuses on abstraction and composition. In these first three chapters you’ll learn how to treat computations as the evaluation of expressions to avoid the mutation of data. To enhance concurrent programming, the functional paradigm provides tools and techniques to write deterministic programs. Output only depends upon input and not on the state of the program at execution time. The functional paradigm also facilitates writing code with fewer bugs by emphasizing separation of concerns between purely functional aspects, isolating side effects, and controlling unwanted behaviors.

This part of the book introduces the main concepts and benefits of functional programming applicable to concurrent programs. Concepts discussed include programming with pure functions, immutability, laziness, and composition.