There are a lot of comments saying that we can't avoid mutable state and dismiss this paper entirely. I find a practical interpretation of this paper is: - Fa

There are a lot of comments saying that we can't avoid mutable state and dismiss this paper entirely. I find a practical interpretation of this paper is: - Favor pure functions over impure functions - Reduce mutable state and be deliberate about where those mutations have to happen - Prefer derived state over keeping state in sync There are always exceptions. Use your judgment on when this simplifies code and when it doesn't.