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Graph/assumed-state-or-change-semantics

AntiPattern

State, Model, and List Semantics

assumed-state-or-change-semantics

UI state and collection change handlers drift because “similar” updates (rebuilds, reversals, sort model swaps, replacement events, and multi-field comparisons) obey framework semantics, so logged variables and listener expectations diverge, yielding wrong UI ordering or stale behavior.

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Updated6/24/2026

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30 linked nodes

MATCHESSolution

you can use Zustand getters and optimistic update — multiple or rapid clicks could actually cause the updates to be executed but out of order. Tension: no optimistic update so u see that delay (lag) you said about.

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set((state) => ({ appSettings: {...state.appSettings, [val]: data} })) — // store.ts. Tension: it has no effect. Outcome: a working code.

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subscribe to store changes to fire side-effect — What you can do is to subscribe to store changes. Tension: you will have to send the whole state of the store every time it changed. Outcome: use subscribe with selectors.

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Make both select inputs controlled components by binding their value to the zustand language state (using `value={language}`) and updating the store on change via the store `set`/action, so both selects re-render and stay in sync.

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Update MasterSteps by returning the next state from set (e.g., set(state => ({ MasterSteps: [...state.MasterSteps, o] }))). Ensure initialState doesn’t conflict by removing or relocating the default MasterSteps: [] value if initialState already provides it.

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Use the functional form of zustand's setState: useStore.setState((prev) => ({ stateOne: { ...prev.stateOne, newProperty: 'value' } })) (and when updating Map/Set, create new instances).

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They both have their own pros and cons — base it on your project requirements. Tension: If you have quite a complex application tree of deeply-nested components Recoil's uses atoms and selectors pattern. Outcome: If you prefer a more direct approach with Zustand your state is stored in a single store and is accessed and modified directly by your components.

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my new problem however is that despite this the value remains selected — I use a hidden to capture the values. Tension: the inputs do actually respect the state changes. Outcome: the inputs do actually respect the state changes.

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Replace the custom components with HTML elements so the state updates work as expected

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Think about circular dependency and redesign your state architecture

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Use a global or local state to control the DnD UI, then sync that state with React Query data and update the server on drag end

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You can maintain a local state using `useState` hook to manage the local state for the list of participants — when the remove button is clicked. Tension: then send the actual update to the backend when the form is submitted. Outcome: setAssistants((prev) => prev.filter((assistant) => assistant.name !== name)).

MATCHESSolution

Wrap Zustand setters with `on*Change` handlers that detect whether the argument is a function and, if so, compute the new state from the current table state before calling the store setter (e.g., for pagination).

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Lift mutation state to a shared owner (same parent) or to shared global/local state (React Context/Redux or local state in a shared parent), and update that state inside `onSuccess`/`onError`/`onSettled` (or `isPending`) callbacks; alternatively, read mutation status via the same `useMutation` instance passed/shared with the other component.

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No ref to prevent redundant state updates — `setState` inside an observer callback that runs on every scroll event. Tension: React still processes the `setState` call even if the value is the same. Outcome: const lastIdRef = useRef(null);.

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Keep two listeners or refactor so one wrapper function registers both listeners that call the same shared effect logic; alternatively, create a single predicate/matcher that encompasses both conditions if feasible.

MATCHESSolution

Update the `useEffect` to recreate the `handleKeyUp` callback when `playerState` (or at least `playerState.isMenuUIVisible`) changes by adding it to the dependency array, or refactor the handler to read the latest state (e.g., via a ref) so it doesn’t rely on stale closure values.

MATCHESSolution

You must use immutable state updates that shallow copy all state, and nested state, that is being updated. — when the event is "user-changed-channel". Tension: `const obj = { ...state.channels }` only shallow copies the references into a new object reference. Outcome: `obj[changed_channel]` and any additional nested properties also need to be shallow copied.

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depending on your latency budget. Outcome: Same idea, but the state lives outside the process boundary.

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Update the messages state using a functional state updater so it always filters the latest state, and ensure any derived `children`/wrapper state is computed from the current children rather than reused/stored stale values.

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Listen to the `filterModified` event, store the modified filter model from the UI using `getModelFromUi`, and after each batch update restore the UI state with `setModelIntoUi` (via `getFilterInstance(...).setModelIntoUi(...)`).

MATCHESSolution

Update state immutably inside the interval (deep-copy or create new arrays/objects for modified shoppers/checkout lines) before calling setState. Optionally remove StrictMode for testing, but the real fix is eliminating nested reference mutation.

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resize events often occur as many events in quick succession. Tension: the resize behaviour is also a little broken. Outcome: React queues the update.

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Update the Context state from within the SignalR handler by invoking context methods (e.g., incorporating/using the patrols and update functions directly in the SignalR call path) so the global state is actually changed when messages arrive.

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Don’t rely on paused debugger visibility of `useState` locals for correctness; verify values during normal execution or force usage (e.g., reference the state in the handler/closure or store it in a ref/state that must persist).

MATCHESSolution

I primarily use view models in the web layer. — To decouple the database layer from the web layer in Spring Boot. Tension: This separation ensures that the web layer does not directly expose or depend on the structure of the underlying database entities. Outcome: three view models should suffice.

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Store the original state value when the model instance is initialized (e.g., in __init__ or via a pre-save hook), then compare that stored value to self.state inside save to decide whether it changed before calling super().save().

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Use model instances instead of model class attributes

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Tension: the mixins classes like CreateModelmixin, Listmixin, etc features are already available in class-based view.

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BuildHash controls when the panel re-renders. — s&box UI uses Razor (.razor files) paired with PanelComponent. Tension: Key patterns:. Outcome: StateHasChanged();.

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