This example visualizes daily active user counts by processing a hardcoded dataset of user IDs and their activity dates. It first concatenates all user activity date strings into a single delimiter-separated string, then uses an array of dates generated with Moment.js to count occurrences of each date in that combined string via string splitting and array length arithmetic. The result is a plain object mapping each date to its activity count, computed synchronously within a `console.time` block to measure performance. The visualization relies on native JavaScript array methods and Moment.js date formatting, with no external charting or rendering library involved.