yeah, I'd say its quite simple. there is "Functional programming", and it is an umbrella term. Then there is "purely functional programming" and it's kind of be

yeah, I'd say its quite simple. there is "Functional programming", and it is an umbrella term. Then there is "purely functional programming" and it's kind of better defined than it's hypernym. For purely functional programming we are certain that we want to be immutable, try to limit the usage of effects. Lately, I think, there is even a de-emphasis in _functions_ as the base of (purely) functional programming. What's now beimg emphasized is the composability-aspect. Functions are an abstraction that is composable, but so are other abstractions.