Average Watch Time: Infinity — JavaScript Bug Hunt

Briefing

Inspired by every analytics dashboard that has proudly displayed "Infinity minutes" or "NaN%" on launch day, before any traffic arrived. Division needs a denominator.

metrics.js computes the overview cards.

Bug report

BUG-INF · Reported by: dashboards

• avgWatchMs(totalMs, viewers): 0 viewers -> 0
• clickRate(clicks, views): percentage with ONE decimal; 0 views -> 0

Observed: fresh channels show "Infinity" and "NaN%" cards.

Logs

[cards] avg watch: Infinity min · CTR: NaN%

The code as shipped

src/stats/metrics.js (editable)

// Overview card metrics.
exports.avgWatchMs = function (totalMs, viewers) {
  return Math.round(totalMs / viewers);
};

exports.clickRate = function (clicks, views) {
  return Math.round((clicks / views) * 1000) / 10;
};