▸case-04 Our team is debating whether to wrap our entire React application in 15 different Context providers to manage every piece of state, from user sessions to individual dropdown open/closed statuses. What is the recommended approach for using this built-in API for application-wide data? | pass→pass | 14,133 | 8,115 | -43% | 1 | 1 | 0% | 2,402 | 1,900 | -21% | 0 | 0 | — |
▸case-05 We have a React search page with pagination, sort order, and category filters. We want users to be able to share links to their specific search results. Currently, we are storing the current page and active filters in a global Zustand store. How should we refactor this specific data? | pass→pass | 14,099 | 7,906 | -44% | 1 | 1 | 0% | 2,436 | 1,870 | -23% | 0 | 0 | — |
▸case-06 I have a React component tree where a 'Sidebar' component has an 'isOpen' boolean. Currently, this boolean is kept in a global Redux store at the very top of the app, even though only the Sidebar and its immediate parent 'Layout' care about it. What is the best practice for this specific boolean? | pass→pass | 9,949 | 7,533 | -24% | 1 | 1 | 0% | 1,532 | 1,766 | +15% | 0 | 0 | — |
▸case-01 I am starting a new React dashboard for an e-commerce platform. We have user profiles fetched from an API, a dark/light mode toggle that affects the whole app, some complex form inputs in a specific modal, and active filters in the product grid. Please provide a state management architecture plan that recommends the right tools for these different pieces of data. Output the plan as a bulleted list explaining the approach for each data type. | fail→fail | 10,399 | 6,908 | -34% | 1 | 1 | 0% | 1,949 | 1,525 | -22% | 0 | 0 | — |
▸case-02 In our React data grid, we have an array of 5000 rows in a local state variable. We need to display a filtered version of this array based on a text input. Many developers suggest using a useEffect to watch the text input and update a second state variable called 'filteredRows'. Write a short code snippet showing the optimal way to handle this filtered data. | pass→pass | 5,466 | 5,493 | +0% | 1 | 1 | 0% | 1,129 | 1,272 | +13% | 0 | 0 | — |
▸case-03 We are building a React application that fetches a list of products from our backend and also tracks which products the user has locally 'selected' for comparison. Should we store both the fetched product list and the local selection IDs in a single unified Redux store? Provide a brief architectural recommendation. | fail→pass | 8,685 | 5,863 | -32% | 1 | 1 | 0% | 1,534 | 1,285 | -16% | 0 | 0 | — |
▸case-07 We have a deeply nested React component tree (6 levels deep). The top-level component holds a 'userPreferences' object, and we are passing it down through every intermediate component via props, even though the middle 4 components don't use it. What architectural anti-pattern is this, and how do we resolve it for global UI data? | pass→pass | 9,649 | 8,394 | -13% | 1 | 1 | 0% | 1,913 | 1,800 | -6% | 0 | 0 | — |
▸case-08 We need to manage a global 'theme' (light/dark) and 'sidebar collapsed' state across our React application. We want a lightweight solution without the boilerplate of Redux. What are the two recommended tools for this type of global UI data? | pass→pass | 6,346 | 4,149 | -35% | 1 | 1 | 0% | 1,254 | 1,125 | -10% | 0 | 0 | — |
▸case-09 Inside a single React component, I need to manage a complex object representing a multi-step form's current draft. It doesn't need to be accessed anywhere else in the app. What built-in React hooks should I choose between for this? | fail→pass | 10,290 | 7,798 | -24% | 1 | 1 | 0% | 1,918 | 1,933 | +1% | 0 | 0 | — |
▸case-10 Our React app makes heavy use of REST APIs to fetch, cache, and mutate database records. We are currently using standard fetch inside useEffect and storing the results in useState. What specific libraries should we adopt to handle this data type instead? | pass→pass | 12,553 | 8,373 | -33% | 1 | 1 | 0% | 2,268 | 1,895 | -16% | 0 | 0 | — |
▸case-11 In our React component, we have a state variable for 'firstName', a state variable for 'lastName', and a third state variable for 'fullName' which we update whenever the first two change. What principle of state architecture does this violate, and how should we fix it? | pass→pass | 7,767 | 4,330 | -44% | 1 | 1 | 0% | 1,469 | 1,100 | -25% | 0 | 0 | — |
▸case-12 We have a user preferences object in our React app that we want to save across browser sessions. What is the standard web API to achieve this persistence? | pass→pass | 8,085 | 5,145 | -36% | 1 | 1 | 0% | 1,685 | 1,266 | -25% | 0 | 0 | — |
▸case-13 We are building a real-time chat application in React and need to receive messages pushed from the server instantly. What protocol should we use for this real-time connection? | pass→pass | 11,462 | 7,075 | -38% | 1 | 1 | 0% | 2,063 | 1,482 | -28% | 0 | 0 | — |
▸case-14 In a React class component, we used to use componentDidMount to focus an input element when the component first renders. What is the modern functional component equivalent for this imperative DOM action? | pass→pass | 6,398 | 4,524 | -29% | 1 | 1 | 0% | 1,137 | 1,120 | -1% | 0 | 0 | — |
▸case-15 A junior developer on my team wants to put every single variable, including hover states and temporary input values, into our global Redux store so that 'everything is in one place'. What is the primary guiding resource principle regarding where state should live by default? | pass→pass | 10,991 | 7,017 | -36% | 1 | 1 | 0% | 1,785 | 1,170 | -34% | 0 | 0 | — |
▸case-16 We are fetching a list of blog posts from our CMS via a GraphQL endpoint. In the context of React architecture, what specific category or 'type' of state does this data represent? | pass→pass | 6,786 | 3,993 | -41% | 1 | 1 | 0% | 1,171 | 779 | -33% | 0 | 0 | — |
▸case-17 We have a user authentication token and a user role (admin vs guest) that dictates the rendering of components in almost every route of our React application. What specific category or 'type' of state does this represent? | pass→pass | 6,982 | 4,630 | -34% | 1 | 1 | 0% | 1,202 | 1,046 | -13% | 0 | 0 | — |
▸case-18 A specific accordion component needs to track whether its content panel is currently expanded or collapsed. No other component in the application cares about this information. What specific category or 'type' of state does this represent? | pass→pass | 4,249 | 2,433 | -43% | 1 | 1 | 0% | 704 | 655 | -7% | 0 | 0 | — |
▸case-19 We have a product listing page where the user has selected a 'price range' filter and a 'color' filter. We want these selections to persist if the user refreshes the page or shares the link. What specific category or 'type' of state does this represent? | pass→pass | 6,335 | 3,566 | -44% | 1 | 1 | 0% | 1,107 | 928 | -16% | 0 | 0 | — |
▸case-20 I am refactoring an old React component that fetches user data. It currently uses a useEffect hook to call the API, sets a 'loading' state to true, awaits the response, sets the 'data' state, and catches errors into an 'error' state. What specific tool should I replace this entire pattern with? | pass→pass | 7,176 | 3,420 | -52% | 1 | 1 | 0% | 1,385 | 984 | -29% | 0 | 0 | — |
▸case-21 We need to add a simple global state for a 'shopping cart' in our React app. We want to avoid the heavy boilerplate, actions, and reducers associated with traditional global state libraries. What modern, lightweight alternative is recommended for this global UI state? | pass→pass | 10,228 | 6,234 | -39% | 1 | 1 | 0% | 1,856 | 1,453 | -22% | 0 | 0 | — |
▸case-22 I am building a complex data grid component in React. The local state involves multiple sub-values that change together (e.g., sorting column, sort direction, active page, and selected rows). Managing this with 5 different useState hooks is becoming messy. What alternative built-in hook is recommended for this complex local state? | pass→pass | 9,952 | 6,494 | -35% | 1 | 1 | 0% | 1,969 | 1,783 | -9% | 0 | 0 | — |