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A comment on Interview with Simon Peyton-Jones. Parent comment

Re:Interview with Simon Peyton-Jones by coldtea on Friday April 20, 2018 @10:38AM (#16885114)
>Taking the example of a NLE program - it has lots of domain-specific state which you must absolutely understand if you want to write such a program. And you absolutely must have a vision how this state should be reflected on the screen. Choosing how to do it is a lot of work. Actually drawing it should be the smaller amount of work, by far. Just separate the state from the GUI library. If you scatter it over thousands of objects, inheriting implementations that you don't own and don't understand - well, of course! that's really hard.

My point was rather than just the essential GUI functionality and interactions for such a program can be very complex.

In other words, when to show this or that, how to structure code to show it fast, how to present it best, etc is also essential logic (not some afterthought on top of the domain logic), and it can also be super-hard to code (depending on the kind of program).

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Re:Interview with Simon Peyton-Jones by jstimpfle on Friday April 20, 2018 @10:51AM (#16885232)
> how to structure code to show it fast

It's pretty trivial, at least not any sort of GUI-specific hard problem. There is only a low number of objects on any given screen. Don't raster pixel-by-pixel on the CPU, of course.

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Re:Interview with Simon Peyton-Jones by coldtea on Friday April 20, 2018 @02:38PM (#16887383)
It's only pretty trivial if you're doing an app that has some forms and does some CRUD and so on.

For anything above that, it can hairy real fast.

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