What are pure functions?
A pure function is a function that always produces the same output for the same input and has no side effects. Let's break down these characteristics:
Pure functions offer several advantages:
The `add` function is pure because it takes two parameters and returns their sum, without modifying any external state or relying on any external data.
In this case, the `addToTotal` function modifies the `total` variable outside its scope, which makes it impure. It also relies on external data (`total`) to calculate its output.
In functional programming and libraries like Redux, pure functions are highly preferred, as they contribute to a more predictable and maintainable codebase by minimizing side effects and reducing complexity.