Edit: It’s not deepcopying the whole struct, just the parts that need to point to something new. So if you update a.b.c, it will shallow-copy a and a.b, but nothing else.

Lenses serve many purposes. All I’m saying is that in practice, the most common role they fulfil is to act as a counterpart for mutable references in contexts where you want or need immutability.

Can the use of lenses make a program more “composable”? Maybe, but if you have an example of a program taking advantage of that flexibility I’d like to see it.

Your natural alternative to lenses in imperative languages is usually to just store a reference or pointer to the part you want to modify. Like a lens, but in-place.

I guess you gain persistence of your entire app’s state (which makes time travel debugging easier) but that’s all I can think of.

It’s scummy to shove ads in my face without at least warning me and giving me a chance to leave, I think.

I believe that if society actually wants people to open up about their problems and seek help, it can’t pull this sort of shit on them.

I see that explanation for the increased suicide risk caused by antidepressants a lot, but what’s the evidence for it?

It doesn’t necessarily have to be a study, just a reason why people believe it.

Christoph Peters’s free blue noise textures are the most commonly used, for people who can’t be bothered running void and cluster themselves: https://momentsingraphics.de/BlueNoise.html