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⚡ Bolt: O(1) scheduling accumulator#137

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anyulled wants to merge 2 commits intomainfrom
bolt/optimize-schedule-accumulator-8118597572898112122
Open

⚡ Bolt: O(1) scheduling accumulator#137
anyulled wants to merge 2 commits intomainfrom
bolt/optimize-schedule-accumulator-8118597572898112122

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@anyulled
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@anyulled anyulled commented Mar 31, 2026

💡 What: Replaced O(N^2) array spread operations inside getSchedule with an amortized O(1) Array.prototype.push.
🎯 Why: Using [...existing, session] inside a loop to construct grouped arrays creates excessive intermediate objects and triggers heavy garbage collection, severely impacting runtime execution on large schedule lists.
📊 Impact: Reduces array allocations from O(N^2) to amortized O(1) per session group. This significantly lessens runtime CPU overhead and garbage collection time when calculating daily schedules.
🔬 Measurement: Verify tests run fine and no regressions exist with npm run test and npm run lint. Time differences can be observed when generating a highly congested schedule in __tests__/schedule_performance.test.ts.


PR created automatically by Jules for task 8118597572898112122 started by @anyulled

Summary by CodeRabbit

  • Refactor
    • Improved session scheduling/grouping performance to reduce redundant work when building time-based session lists, resulting in faster schedule loading and smoother browsing of session time slots for end users.

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vercel bot commented Mar 31, 2026

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devbcn Ready Ready Preview, Comment Apr 1, 2026 5:16pm

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coderabbitai bot commented Mar 31, 2026

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7b311b41-b10a-4144-bfc8-a4358656ae52

📥 Commits

Reviewing files that changed from the base of the PR and between a20e22c and bc37cf2.

📒 Files selected for processing (1)
  • hooks/useSchedule.ts

📝 Walkthrough

Walkthrough

Replace immutable array reassignments with in-place mutations when grouping sessions by timeKey in hooks/useSchedule.ts: initialize a single-element array for missing keys or append to the existing array via .push().

Changes

Cohort / File(s) Summary
Schedule Grouping
hooks/useSchedule.ts
Change grouping insertion from `existing = sessionsByTime.get(key)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

Suggested labels

size/size/XXL

Poem

🐰 I hop through keys and timings bright,

No more spreading — I push with delight.
Sessions nestle in their slot,
One small change, the map stays taut.

🚥 Pre-merge checks | ✅ 3
✅ Passed checks (3 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title accurately reflects the main optimization change—replacing O(N²) array spread operations with O(1) push mutations for efficient schedule accumulation.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

✨ Finishing Touches
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🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch bolt/optimize-schedule-accumulator-8118597572898112122

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Code Review

This pull request optimizes the session grouping logic in hooks/useSchedule.ts by replacing array spreading with Array.prototype.push to improve performance. The reviewer recommends removing the verbose inline comments and task-specific markers added in the change to keep the codebase clean.

Comment on lines +62 to +68
if (!existing) {
sessionsByTime.set(timeKey, [session]);
} else {
// ⚡ Bolt: Use amortized O(1) Array.prototype.push instead of O(N) array spread
// Eliminates O(N^2) time complexity and excess garbage collection in inner loop
existing.push(session);
}
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medium

The inline comment contains task-specific markers ("⚡ Bolt") and meta-commentary about the PR's intent that clutter the codebase. Standard performance optimizations usually don't require such verbose documentation unless the logic is non-obvious. Consider removing the comment to maintain a clean codebase.

          if (!existing) {
            sessionsByTime.set(timeKey, [session]);
          } else {
            existing.push(session);
          }

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@hooks/useSchedule.ts`:
- Around line 65-66: Replace the two consecutive single-line comments containing
"⚡ Bolt: Use amortized O(1) Array.prototype.push instead of O(N) array spread"
and "Eliminates O(N^2) time complexity and excess garbage collection in inner
loop" with a single block comment (/* ... */) so the comment spans multiple
lines in block form; locate the comment in hooks/useSchedule.ts (near the inner
loop where Array.prototype.push is preferred) and convert to a proper multi-line
block comment to satisfy ESLint's block-comment rule.
🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

  • Push a commit to this branch (recommended)
  • Create a new PR with the fixes

ℹ️ Review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c61b6c13-5627-4745-86d0-5dd747fd31a1

📥 Commits

Reviewing files that changed from the base of the PR and between 45adfda and 6bc045d.

📒 Files selected for processing (1)
  • hooks/useSchedule.ts

anyulled and others added 2 commits April 1, 2026 19:14
Replaced O(N^2) array spread operations inside the useSchedule hook with an amortized O(1) push mutation to prevent excessive memory allocations.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Replaced O(N^2) array spread operations inside the useSchedule hook with an amortized O(1) push mutation to prevent excessive memory allocations.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
@anyulled anyulled force-pushed the bolt/optimize-schedule-accumulator-8118597572898112122 branch from a20e22c to bc37cf2 Compare April 1, 2026 17:14
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