This example demonstrates JavaScript array manipulation methods using D3.js version 6. The code defines a custom `range` function to create a numeric array and then explores `forEach`, `filter`, `map`, `reduce`, and sorting operations on it. It also shows how to sort an array of objects by a key using a custom comparator, alongside D3’s `ascending` helper. All code is written in plain JavaScript with logging to the console; there is no visual output or rendering, focusing purely on illustrating array programming concepts.