This example demonstrates JavaScript array methods—range, forEach, filter, sort, map, and reduce—through console output, illustrating how each operates on numeric and object data. The code builds a range array via a custom function using a for loop and push, then applies methods such as filter for even numbers, sort on numbers and object keys, and reduce for summation and key-value aggregation. It runs in a minimal HTML page with an embedded script, using plain JavaScript with no external visualization library despite d3 being listed as a dependency.