This example demonstrates how to load external data in a React application using D3 utilities while managing the fetched data with React state. It shows a text summary reporting the dataset's size in kilobytes, row count, and column count. The code uses React's `useState`, `useEffect`, and `useCallback` hooks, alongside D3's `csv` function to load a CSS named-colors CSV from a GitHub gist. The `message` module formats the summary using `d3.csvFormat` to calculate the data’s byte length.