This example demonstrates core JavaScript array methods—including `forEach`, `filter`, `map`, `reduce`, and `sort`—applied to a generated numeric range and object entries. It shows how to transform, aggregate, and order data step by step, with commented examples illustrating each operation. The code uses plain JavaScript for most array manipulations, while the `index.js` variant imports `ascending` from the D3 library to sort objects by key in ascending order. The visualization relies entirely on console output rather than graphical rendering.