This example demonstrates core JavaScript array operations implemented by hand, including range generation, filtering, sorting, mapping, and reducing. The code uses D3 v7’s `ascending` comparator within a custom `sort` function to order objects by key, then reduces an array of key-value pairs into a single object. All logic runs in the browser console, producing logged output for each step; the page itself is intentionally blank, with SVG shapes referenced only in the README. The visualization relies purely on native JavaScript methods and D3’s utility functions, with no graphical rendering.