⚡ Bolt: Use Set for O(1) session lookups in schedule filter#236
⚡ Bolt: Use Set for O(1) session lookups in schedule filter#236anyulled wants to merge 2 commits into
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Refactored the `filterSessions` function in `ScheduleContainer.tsx` to use a `Set` for `savedSessionIds`. This improves the membership check from O(N*M) to O(N+M) time complexity, reducing execution time when rendering or filtering the schedule grid. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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Actionable comments posted: 1
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Inline comments:
In @.jules/bolt.md:
- Around line 5-7: Fix the Prettier formatting issues in the .jules/bolt.md
entry titled "2024-05-23 — O(1) Lookups inside filter loops" by running the
formatter (prettier --write .jules/bolt.md) or applying equivalent Prettier
rules so the CI-styled markdown (headers, list punctuation, backticks around
Array.prototype.includes/Array.prototype.filter/.map) conforms to the repo's
Prettier config; then re-run CI and remove any stray .orig patch files
referenced in the note before committing.
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📒 Files selected for processing (2)
.jules/bolt.mdcomponents/schedule/ScheduleContainer.tsx
Refactored the `filterSessions` function in `ScheduleContainer.tsx` to use a `Set` for `savedSessionIds`. This improves the membership check from O(N*M) to O(N+M) time complexity, reducing execution time when rendering or filtering the schedule grid. Also ran Prettier to format markdown files in `.jules/bolt.md` to fix CI failure. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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Code Review
This pull request optimizes session filtering in ScheduleContainer.tsx by replacing an O(N*M) array lookup with an O(1) Set lookup, significantly improving performance for large lists. This best practice is also documented in .jules/bolt.md. Feedback suggests further improving React performance by maintaining referential equality when the filtered list remains unchanged, which prevents unnecessary re-renders of child components.
| const savedSessionIdsSet = new Set(savedSessionIds); | ||
| const filterSessions = (sessions: GridSession[]) => sessions.filter((s) => savedSessionIdsSet.has(s.id) || s.isServiceSession); |
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While the current optimization to O(N+M) is excellent, you can further improve React performance by ensuring referential equality for rooms and sessions that are not affected by the filter. This prevents unnecessary re-renders of child components like SessionCard or ScheduleGrid sub-sections.
Consider checking if the filtered array length matches the original length to return the original reference.
const savedSessionIdsSet = new Set(savedSessionIds);
const filterSessions = (sessions: GridSession[]) => {
const filtered = sessions.filter((s) => savedSessionIdsSet.has(s.id) || s.isServiceSession);
return filtered.length === sessions.length ? sessions : filtered;
};
1 participant
💡 What: Refactored the
ScheduleContainer.tsxto initializesavedSessionIdsinto aSetbefore using it inside the.mapand.filterloop iterations.🎯 Why: Using
Array.prototype.includes()inside a nested array iteration loop causes an O(N*M) time complexity. For large schedules with many sessions, this creates an unnecessary bottleneck on the main thread during render and filtering.📊 Impact: Changes the lookup time from O(N*M) to O(N+M), reducing CPU time for list processing. This will make switching tabs and filtering the schedule list feel noticeably faster, especially on low-end devices.
🔬 Measurement: Verify by using React DevTools Profiler to measure the render time of
ScheduleContainerwhen toggling the "My Schedule" filter on a day with many sessions. Render time should decrease.PR created automatically by Jules for task 7780564674407765780 started by @anyulled
Summary by CodeRabbit
Documentation
Refactor