⚡ Bolt: Optimize array spread to amortized O(1) push in schedule hook

[anyulled]

💡 What: Replaced array spread syntax [...existing, session] with existing.push(session) inside the nested loop in hooks/useSchedule.ts.
🎯 Why: Array spread syntax inside a loop forces memory reallocation and O(N) copying per element, resulting in an O(N^2) total cost when building large groups.
📊 Impact: Decreases memory consumption and GC pauses by avoiding repetitive object allocations, making the schedule parsing significantly faster for large datasets.
🔬 Measurement: Observe heap memory snapshots and reduced execution time of the getSchedule function.

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PR created automatically by Jules for task 11284403216959270980 started by @anyulled

Summary by CodeRabbit

• Chores
  • Optimized internal schedule aggregation to reduce allocations and improve performance when building time-based session groupings.
  • No changes to exported APIs or visible behavior; user-facing functionality, sorting, and display remain unchanged.

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[qodo-code-review]

Review Summary by Qodo

Optimize schedule parsing with O(1) push instead of spread

✨ Enhancement

Walkthroughs

Description

• Optimize array spread to amortized O(1) push in schedule hook
• Replace O(N²) array spread syntax with O(1) push operation
• Reduce memory reallocation and GC pauses for large datasets
• Add explicit null check and inline performance documentation

Diagram

flowchart LR
  A["Array Spread O(N²)"] -->|"Replace with"| B["Push O(1)"]
  B -->|"Result"| C["Faster Schedule Parsing"]
  C -->|"Benefits"| D["Lower Memory & GC"]

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File Changes

1. hooks/useSchedule.ts ✨ Enhancement +8/-2

Optimize array operations in schedule parsing loop

• Replaced array spread syntax [...existing, session] with existing.push(session) in nested loop
• Added explicit null check to handle missing timeKey entries
• Initialize new array directly when timeKey doesn't exist
• Added performance documentation comments explaining O(1) amortized complexity benefit

hooks/useSchedule.ts

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[coderabbitai]

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: 70f0aac6-1741-46c2-a0aa-13ce34b08509

📥 Commits

Reviewing files that changed from the base of the PR and between cb06221 and 27b2cb6.

📒 Files selected for processing (1)

• hooks/useSchedule.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• hooks/useSchedule.ts

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📝 Walkthrough

Walkthrough

The getSchedule function in hooks/useSchedule.ts was changed to use in-place array mutation when grouping sessions by time: it initializes a single-element array for new keys and appends with .push() for existing keys, replacing the previous per-iteration spread-based array creation.

Changes

Cohort / File(s)	Summary
Schedule Grouping Optimization hooks/useSchedule.ts	Replaced per-iteration array spread aggregation ([...existing, session]) with conditional initialization and in-place .push() to avoid repeated array allocations when grouping sessions by time.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• ⚡ Bolt: Optimize talk grouping performance #105: Applies the same per-iteration spread→push optimization pattern in a related hook grouping implementation.
• ⚡ Bolt: Add React.cache to getSchedule hook #24: Modifies the same getSchedule implementation with alternative enhancements (caching and tests).

Suggested labels

size/size/XXL

Poem

🐰 I hopped through maps and arrays tonight,

Pushed each session, kept memory light.
No more spreads in every loop,
My tiny paws improved the soup—
A tidy schedule, snug and right.

🚥 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 directly relates to the main change: replacing array spread with in-place push to optimize performance from O(N²) to amortized O(1) in the schedule hook.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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🧪 Generate unit tests (beta)

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• Commit unit tests in branch bolt-optimize-schedule-spread-11284403216959270980

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[qodo-code-review]

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[gemini-code-assist]

Code Review

This pull request optimizes the session grouping logic in hooks/useSchedule.ts by replacing the array spread operator with the push method to improve performance and reduce memory overhead. Feedback suggests removing the newly added explanatory comments and branding to keep the code clean and maintainable, as the optimization is standard and self-explanatory.

[gemini-code-assist]

The comments added here contain tool-specific branding ("Bolt") and describe the impact of the change, which is information better suited for the pull request description. In the source code, these comments add unnecessary noise as the optimization (using push instead of spread) is a standard performance practice and the code is self-explanatory. Removing them improves code maintainability.

Suggested change

	// ⚡ Bolt: Use amortized O(1) push instead of O(N^2) array spread inside loop
	// Impact: Decreases memory consumption and GC pauses for large schedule datasets
	existing.push(session);
	existing.push(session);

[coderabbitai]

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 66-67: Convert the two consecutive single-line comments starting
with "⚡ Bolt: Use amortized O(1) push..." and "Impact: Decreases memory..." into
a single block comment (/* ... */) inside the useSchedule hook file so the
multiline-comment-style lint rule no longer fails; locate the comments near the
code that builds the schedule (search for those exact phrases or the useSchedule
function) and replace the pair of // lines with one /* ... */ block preserving
the same wording.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

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

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6769d3b0-54d7-4c90-8164-5c821e72f691

📥 Commits

Reviewing files that changed from the base of the PR and between 81f3c53 and cb06221.

📒 Files selected for processing (1)

• hooks/useSchedule.ts