This example demonstrates how React state manages data loaded asynchronously with D3. It fetches a CSV file of CSS named colors from a GitHub gist using `d3.csv` and stores the result in state via `useState` and `useEffect`. Once loaded, the app displays a text summary of the dataset, including file size in kilobytes, row count, and column count, computed with `d3.csvFormat`. While loading, it shows a “loading…” placeholder. The visualization is purely textual, highlighting the integration of D3’s data-loading utilities with React’s component life cycle.