Knuth, predicting "a monad is a monoid in the category of endofunctors":pic.twitter.com/yGL0Iul2DQ
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But how much global state is good? I mean, you let some global state in, and before you know it, it starts taking over your whole life. It keeps making demands, asking for special treatment, setting up rules. I don't know--maybe the sad place is all we have.
I addressed this earlier in the thread. The amount of global state that is good is the amount natural to your problem. More is bad, but less is also bad. Pretending not to need state, when you really do, is just obfuscating your program.
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But, you know, I am willing to admit if I am wrong. If you want to tell me how to render something like Apex Legends at 240Hz without using global state such as texture maps in GPU memory, in such a way that the program is cleaner and simpler, I will definitely listen.
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Purity ends there, meaningfully. You'd still upload data to the GPU, and the most toplevel part of your rendering code needs live in the IO monad.
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