In this article, we will understand one of the key concepts of functional programming which is the use of pure functions.
A pure function is a function that, given the same input, always returns the same output, and has no side effects.
In other words, it does not modify any external state, and it does not depend on any external state.
A pure function is completely self-contained, and its output depends solely on its input.
In all of these examples, the functions are pure because they do not modify any external state, and they always return the same output for a given input.
Predictability: Because pure functions always return the same output for a given input, they are highly predictable. This makes them easier to reason about, test, and debug.
Reusability: Pure functions can be reused in different parts of your codebase without worrying about side effects or unexpected behavior.
Parallelism: Pure functions can be safely executed in parallel, without the risk of race conditions or other concurrency issues.
Testability: Because pure functions are self-contained and predictable, they are easy to test in isolation.
By avoiding side effects and external state, pure functions make it easier to reason about your code, and they can be reused in different parts of your application.
Try using pure functions in your next project, and see how they can help you write cleaner, more efficient code.