This example demonstrates fundamental JavaScript array operations through console logging, including iteration, filtering, sorting, mapping, and reducing. It shows a custom `range` function, a sorting comparator for numbers, and how to build objects from array entries using `reduce`. The code imports `ascending` and `descending` from D3 to illustrate library-based sorting, and relies on D3 version 7.3.0 for these utilities. The visualization itself is minimal—a single HTML page with a large styled message—while the core content lives in the script’s output.