This example demonstrates JavaScript array manipulation using D3's `ascending` method to sort an array of objects by their `key` property. The code includes commented-out demonstrations of `forEach`, `filter`, `map`, and `reduce` operations, alongside an uncommented `sort` call that orders entries alphabetically. It uses a custom `range` function to generate a numeric array and imports `ascending` from D3 7.6.1, showcasing basic functional programming techniques in a minimal HTML page with no visual output.