Function calculateUniqueArtistCount

Calculate the total unique artist count from all metrics

Determines the total number of distinct artists present in the user's listening history across all time periods. This function employs a Set data structure to ensure each artist is counted only once regardless of how many tracks or listening sessions they appear in.

The counting process includes:

• Processing daily metrics to extract artist IDs from both Set and Array formats
• Directly incorporating artist IDs from the artistMetrics collection for reliability
• Handling various data formats that may result from storage serialization processes

This metric is essential for measuring music discovery and diversity in the user's listening patterns, forming the basis for artist-related analytics and visualizations.

export function calculateUniqueArtistCount(statistics: StatisticsData): number {
  const allArtists = new Set<string>();

  // Collect from daily metrics
  for (const dateKey in statistics.dailyMetrics) {
    const metric = statistics.dailyMetrics[dateKey];
    if (metric.uniqueArtists instanceof Set) {
      Array.from(metric.uniqueArtists).forEach((id) => allArtists.add(id));
    } else if (Array.isArray(metric.uniqueArtists)) {
      metric.uniqueArtists.forEach((id) => allArtists.add(id));
    }
  }

  // Collect from artist metrics directly (more reliable)
  for (const artistId in statistics.artistMetrics) {
    allArtists.add(artistId);
  }

  return allArtists.size;
}
Copy