I’ve recently posted few questions on this forum and received kind answers. Thank you for that! What I wanted to ask you right now is some kind of „early-stage diagnosis” for anything especially wrong with how I understand shadow-cljs and reagent should be used together in order to help me catch any bad behaviors (and I do expect them, as I am completely new to both ClojureScript and Reagent, although having experience in other Lisps).
That’s the sample page with shadow-cljs, reagent, secretary and accountant.
(Of course the content is completely dumb placeholder, I was just lurking around)
I am not convinced if request like that is appropriate here or not - I really apologize if this is going to be unkind or against some rules. If not - I am waiting for all the criticism at this very first step.
Which one is better? I don’t know! I like the idea of passing app-state atom as a page argument to keep it free (sort of) of hardcoded side effects. But as of writing this, I am starting to be more towards using this little merge and be able to keep state in one place (maybe this will be useful with some Redux implementation? I haven’t explored this area in CLJS yet).
What I don’t like in my approach is keeping reagent component inside application state, and I think that’s the main flaw. Maybe I should do it more like, following reagent-cookbook:
Looks good. Reagent by itself is pretty agnostic about using a single ratom or multiple smaller ones. Personally I sometimes start with multiple ratoms while exploring, then refactor to collect all state in a single !app-state var (I use the leading exclamation mark to mean “atom-like var”). Reasons why I think it’s often a good idea:
Unification: When there are bugs, you know where to look, in contrast to state being spread out across multiple places around your app.
Tooling: You can use tools like data-frisk or re-frame-trace to inspect the data in a well known location (or just (prn @!app-state) from the REPL)
Greppability: Every line of code that affects state has the word !app-state in it.
Finally, once you think it’s time to regulate state updates more strictly, you can smoothly move on to re-frame or one of the other state-management frameworks for Reagent.
Yes, I consider system as a tool for handling stateful components of a system which have the needs to take extra care of lifecycle. However, the data of the application is not under this category. For example, if you are building a todo app, where to read/store your todos? you will need a database/datastore for storing your app data. system will be used to manage your connection/reference to the database/datastore, but data itself should not be managed by system.
your example are pretty much close to finish, the parts left are
how to organise/manipulate you data/data model,
how to handle side effects/async stuffs (ajax, scheduling rerender, local storage…etc),
how to handle quirks/performance.
This is becoming blurry, but I think that database connection issystem, actually displayed page also is system but list of todo items or state of the coutner is notsystem. For me, dividing line is between runtime state and data state.