Lol this is the wrinkle - FP is great for humans, but under the hood, what is memory but a big block of mutable state? Sometimes we have to dig into the specifics for performance.
That being said - Rust knows that the instance of Player passed in is the only reference, and it can re-use that memory - maybe even mutate it in-place ;) while still presenting an FP interface to the user.
My dear friend - what if I told you that every call to Player.move should return an entirely new instance of a Player? One with an immutable position, and a helper function that takes a position delta - and constructs yet another Player!
What if I told you that all user interfaces are a function of application state; and all interactions apply a transformation that is then re-rendered? (We have gotten very good at only re-rendering the parts that change.)
Welcome to FP! There’s a whole world here for you to explore. You’ll be telling your friends about monoids and endofunctors before you know it :)
I’m so glad society has teams allocated to identifying these hard-hitting issues. It’s true - we don’t have enough consumer protections in place for space tourists. A poor innocent space tourist could “go to space” without fully understanding that “space can be dangerous”. Thankfully, these analysts discovered this issue before too many people were “at risk”. Future space tourists will have to sign a waver, or watch a presentation, or something.
The interesting question here is who paid for this “study”, and who from the register accepted the bribes to get this dogshit published.
Thank you, that’s an excellent read! This reminds me of the “expected value of perfect information” - sometimes it is worthwhile to answer a question, and sometimes it isn’t. Every once in a while I find myself in an engineering call discussing a minor problem, and I run the numbers to see if the change we are discussing is even worth talking about. One time the combined salaries of the people on the call had already outpaced the cost savings of the change over the next 10 years. We quickly stopped that discussion lol