Function coalesceByDay

website/script/benchmarks.js:322–329

* Coalesce entries by calendar day, keeping the last run of each day. * Entries must be sorted oldest-first.

(entries)

 * Entries must be sorted oldest-first.
 */
function coalesceByDay(entries) {
	const byDay = new Map();
	for (const entry of entries) {
		const day = entry.timestamp.slice(0, 10); // YYYY-MM-DD
		byDay.set(day, entry); // later entries overwrite earlier ones
	}
	return Array.from(byDay.values());
}

/**
 * Thin an array to at most maxPoints by picking evenly spaced entries.