Pure functions in examples - what are they and how do they work?

Pure functions are a key concept in functional programming that is gaining popularity in the IT world. By definition, pure functions are those that always return the same value for the same arguments, and they have no side effects. This characteristic makes them extremely predictable and easy to test. In the article, the author thoroughly presents the benefits of using pure functions, emphasizing how they contribute to improving the overall structure of the code and make refactoring easier. Additionally, pure functions possess significant power in the context of parallel processing, which can greatly enhance application performance. Thanks to the absence of side effects, developers can focus on developing business logic without managing an application state that constantly changes from the outside.