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refactor(timeline): count timelineMeta totals in a single pass

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Replace the flatMap intermediate array plus two filter passes with one
walk over the year bands and the undated bucket. Same counts, no
throwaway allocation.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-06-14 12:19:40 +02:00
parent 84938e1bf3
commit 0bd6790b1f
1 changed files with 10 additions and 3 deletions
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13
frontend/src/lib/timeline/timelineMeta.ts
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@@ -21,11 +21,18 @@ export interface TimelineMeta {
*/
export function timelineMeta(timeline: TimelineDTO): TimelineMeta {
const years = timeline.years;
const allEntries = [...years.flatMap((y) => y.entries), ...timeline.undated];
let letterCount = 0;
let eventCount = 0;
const tally = (e: TimelineDTO['undated'][number]) => {
if (e.kind === 'LETTER') letterCount += 1;
else if (e.kind === 'EVENT') eventCount += 1;
};
for (const y of years) for (const e of y.entries) tally(e);
for (const e of timeline.undated) tally(e);
return {
firstYear: years.length ? years[0].year : null,
lastYear: years.length ? years[years.length - 1].year : null,
letterCount: allEntries.filter((e) => e.kind === 'LETTER').length,
eventCount: allEntries.filter((e) => e.kind === 'EVENT').length
letterCount,
eventCount
};
}