JavaScript Arrays
This example demonstrates JavaScript's array manipulation methods through commented and active code using D3.js. It shows how to create, filter, map, reduce, and sort arrays, including sorting objects by key with D3's `ascending` function. The code displays range generation, even-number filtering, summation via `reduce`, and entry sorting by alphabetical key. Most operations are commented out, revealing only the final active sort of an entries array using `d3.ascending`. The visualization relies on console output rather than graphical rendering, presenting programmatic data handling techniques.