feat: [performance improvement] optimize speaker lookups with O(1) map#268
feat: [performance improvement] optimize speaker lookups with O(1) map#268anyulled wants to merge 2 commits into
Conversation
Replaces O(N) array filtering with O(1) Map lookups for resolving talk speakers. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
|
👋 Jules, reporting for duty! I'm here to lend a hand with this pull request. When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down. I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job! For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with New to Jules? Learn more at jules.google/docs. For security, I will only act on instructions from the user who triggered this task. |
|
The latest updates on your projects. Learn more about Vercel for GitHub.
|
Qodo reviews are paused for this user.Troubleshooting steps vary by plan Learn more → On a Teams plan? Using GitHub Enterprise Server, GitLab Self-Managed, or Bitbucket Data Center? |
|
Warning Review limit reached
More reviews will be available in 55 minutes and 7 seconds. Learn how PR review limits work. Your organization has run out of usage credits. Purchase more credits in the billing tab to continue. ⌛ How to resolve this issue?After more reviews become available, a review can be triggered using the We recommend that you space out your commits to avoid hitting the rate limit. 🚦 How do rate limits work?CodeRabbit enforces hourly rate limits for each developer per organization. Our paid plans include higher PR review limits than trial, open-source, and free plans. In all cases, reviews become available again over time. During sustained high-volume PR review activity, CodeRabbit may temporarily slow when the next review becomes available. Please see our Fair Usage Limits Policy for further information. 📝 WalkthroughWalkthroughThis PR optimizes speaker lookups by introducing a cached ChangesSpeaker Lookup Optimization
Estimated code review effort🎯 2 (Simple) | ⏱️ ~12 minutes Possibly related PRs
Suggested labels
Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches🧪 Generate unit tests (beta)
Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
![gemini-code-assist[bot]](https://avatars.githubusercontent.com/in/956858?s=60&v=4){kind=small}
There was a problem hiding this comment.
Code Review
This pull request optimizes speaker lookups by caching and using a Map instead of repeatedly filtering or finding items in arrays. Feedback focuses on fixing a duplicated and malformed documentation entry in .jules/bolt.md, ensuring that data fetching helpers support and forward the strict option to prevent incomplete page deployments during builds, and deduplicating speakerIds in getTalkSpeakersWithDetails to avoid returning duplicate speaker objects.
Important
The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.
| ## 2024-05-18 - Avoid repeated array filtering/finding for speaker lookups | ||
|
|
||
| **Learning:** In Next.js/React applications, when looking up items (like speakers for a talk) by ID repeatedly, using or inside loops or hot paths causes unnecessary O(N) array traversals per lookup. This is especially problematic when mapping over hundreds of talks. | ||
| **Action:** Always build an O(1) lookup Map wrapped in React's `cache()` (e.g., `new Map(items.map(i => [i.id, i]))`). This ensures the map is only built once per request, and subsequent lookups are instant. | ||
| ## 2024-05-18 - Avoid repeated array filtering/finding for speaker lookups | ||
|
|
||
| **Learning:** In Next.js/React applications, when looking up items (like speakers for a talk) by ID repeatedly, using `.find()` or `.filter()` inside loops or hot paths causes unnecessary O(N) array traversals per lookup. This is especially problematic when mapping over hundreds of talks. | ||
| **Action:** Always build an O(1) lookup Map wrapped in React's `cache()` (e.g., `new Map(items.map(i => [i.id, i]))`). This ensures the map is only built once per request, and subsequent lookups are instant. |
There was a problem hiding this comment.
The newly added section in .jules/bolt.md is duplicated. Additionally, the first block is missing the .find() and .filter() method names in the text (likely due to unescaped HTML-like tag syntax). Please remove the duplicated, broken block and keep only the correct one.
| export const getSpeakersMap = cache(async (year: string | number): Promise<Map<string, Speaker>> => { | ||
| const speakers = await getSpeakers(year); | ||
| return speakers.find((speaker) => speaker.id === speakerId); | ||
| return new Map(speakers.map((speaker) => [speaker.id, speaker])); | ||
| }); | ||
|
|
||
| export const getSpeakerByYearAndId = async (year: string | number, speakerId: string): Promise<Speaker | undefined> => { | ||
| const speakersMap = await getSpeakersMap(year); | ||
| return speakersMap.get(speakerId); | ||
| }; |
There was a problem hiding this comment.
To adhere to the repository's general rules for data fetching during the build process, helper functions like getSpeakersMap and getSpeakerByYearAndId should support and forward the strict option. This ensures that any data fetching failures during static site generation or build time correctly bubble up and fail the build, preventing incomplete page deployments.
| export const getSpeakersMap = cache(async (year: string | number): Promise<Map<string, Speaker>> => { | |
| const speakers = await getSpeakers(year); | |
| return speakers.find((speaker) => speaker.id === speakerId); | |
| return new Map(speakers.map((speaker) => [speaker.id, speaker])); | |
| }); | |
| export const getSpeakerByYearAndId = async (year: string | number, speakerId: string): Promise<Speaker | undefined> => { | |
| const speakersMap = await getSpeakersMap(year); | |
| return speakersMap.get(speakerId); | |
| }; | |
| export const getSpeakersMap = cache(async (year: string | number, options?: { strict?: boolean }): Promise<Map<string, Speaker>> => { | |
| const speakers = await getSpeakers(year, options); | |
| return new Map(speakers.map((speaker) => [speaker.id, speaker])); | |
| }); | |
| export const getSpeakerByYearAndId = async (year: string | number, speakerId: string, options?: { strict?: boolean }): Promise<Speaker | undefined> => { | |
| const speakersMap = await getSpeakersMap(year, options); | |
| return speakersMap.get(speakerId); | |
| }; |
References
- Data fetching functions used during the build process (e.g., for sitemap generation) should include a 'strict' mode that throws an error on failure. This ensures that data fetching problems cause the build to fail, preventing the deployment of incomplete pages.
| export const getTalkSpeakersWithDetails = async (year: string | number, speakerIds: string[]): Promise<Speaker[]> => { | ||
| const speakers = await getSpeakers(year); | ||
|
|
||
| /* Use a Set to keep speaker membership checks fast as speaker lists grow. */ | ||
| const speakerIdsSet = new Set(speakerIds); | ||
| return speakers.filter((s) => speakerIdsSet.has(s.id)); | ||
| const speakersMap = await getSpeakersMap(year); | ||
| const result: Speaker[] = []; | ||
| speakerIds.forEach((id) => { | ||
| const speaker = speakersMap.get(id); | ||
| if (speaker) { | ||
| result.push(speaker); | ||
| } | ||
| }); | ||
| return result; | ||
| }; |
There was a problem hiding this comment.
There are two opportunities for improvement here:
- Correctness/Deduplication: If
speakerIdscontains duplicate IDs, the new implementation will return duplicateSpeakerobjects, whereas the original implementation guaranteed uniqueness. We should deduplicatespeakerIdsusing aSetto prevent potential UI duplication issues. - Strict Mode Support: To adhere to the general rules, we should accept and forward the
strictoption togetSpeakersMapso that fetching failures during build time correctly fail the build.
| export const getTalkSpeakersWithDetails = async (year: string | number, speakerIds: string[]): Promise<Speaker[]> => { | |
| const speakers = await getSpeakers(year); | |
| /* Use a Set to keep speaker membership checks fast as speaker lists grow. */ | |
| const speakerIdsSet = new Set(speakerIds); | |
| return speakers.filter((s) => speakerIdsSet.has(s.id)); | |
| const speakersMap = await getSpeakersMap(year); | |
| const result: Speaker[] = []; | |
| speakerIds.forEach((id) => { | |
| const speaker = speakersMap.get(id); | |
| if (speaker) { | |
| result.push(speaker); | |
| } | |
| }); | |
| return result; | |
| }; | |
| export const getTalkSpeakersWithDetails = async (year: string | number, speakerIds: string[], options?: { strict?: boolean }): Promise<Speaker[]> => { | |
| const speakersMap = await getSpeakersMap(year, options); | |
| const uniqueSpeakerIds = Array.from(new Set(speakerIds)); | |
| const result: Speaker[] = []; | |
| uniqueSpeakerIds.forEach((id) => { | |
| const speaker = speakersMap.get(id); | |
| if (speaker) { | |
| result.push(speaker); | |
| } | |
| }); | |
| return result; | |
| }; |
References
- Data fetching functions used during the build process (e.g., for sitemap generation) should include a 'strict' mode that throws an error on failure. This ensures that data fetching problems cause the build to fail, preventing the deployment of incomplete pages.
![coderabbitai[bot]](https://avatars.githubusercontent.com/in/347564?s=60&v=4){kind=small}
There was a problem hiding this comment.
Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In @.jules/bolt.md:
- Around line 5-12: Remove the duplicated heading/content block so only one
"2024-05-18 - Avoid repeated array filtering/finding for speaker lookups"
section remains, and fix the malformed inline code by replacing the broken
"using or " fragment with explicit backticked `.find()` / `.filter()`; ensure
the Action example still shows `new Map(items.map(i => [i.id, i]))` and that the
section is grammatically intact.
In `@hooks/useTalks.ts`:
- Around line 142-150: Deduplicate speakerIds before looking them up so
duplicate IDs don't produce repeated Speaker entries: in the block that calls
getSpeakersMap(year) and iterates over speakerIds (referencing speakersMap,
speakerIds, and the result: Speaker[] array), convert speakerIds to a Set or
otherwise filter for unique IDs, then iterate that unique list, look up each id
in speakersMap, and push non-null speakers to result before returning; this
preserves the original lookup logic but prevents duplicates.
🪄 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: bce8b651-3f60-4f61-ae84-abdd1ef989a4
📒 Files selected for processing (3)
.jules/bolt.mdhooks/useSpeakers.tshooks/useTalks.ts
| ## 2024-05-18 - Avoid repeated array filtering/finding for speaker lookups | ||
|
|
||
| **Learning:** In Next.js/React applications, when looking up items (like speakers for a talk) by ID repeatedly, using or inside loops or hot paths causes unnecessary O(N) array traversals per lookup. This is especially problematic when mapping over hundreds of talks. | ||
| **Action:** Always build an O(1) lookup Map wrapped in React's `cache()` (e.g., `new Map(items.map(i => [i.id, i]))`). This ensures the map is only built once per request, and subsequent lookups are instant. | ||
| ## 2024-05-18 - Avoid repeated array filtering/finding for speaker lookups | ||
|
|
||
| **Learning:** In Next.js/React applications, when looking up items (like speakers for a talk) by ID repeatedly, using `.find()` or `.filter()` inside loops or hot paths causes unnecessary O(N) array traversals per lookup. This is especially problematic when mapping over hundreds of talks. | ||
| **Action:** Always build an O(1) lookup Map wrapped in React's `cache()` (e.g., `new Map(items.map(i => [i.id, i]))`). This ensures the map is only built once per request, and subsequent lookups are instant. |
There was a problem hiding this comment.
Remove the duplicated section and fix the malformed inline code on Line 7.
The heading/content block is duplicated (MD024), and the first block’s “using or ” is broken. Keep one section and ensure it explicitly says .find() / .filter().
🧰 Tools
🪛 markdownlint-cli2 (0.22.1)
[warning] 9-9: Multiple headings with the same content
(MD024, no-duplicate-heading)
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In @.jules/bolt.md around lines 5 - 12, Remove the duplicated heading/content
block so only one "2024-05-18 - Avoid repeated array filtering/finding for
speaker lookups" section remains, and fix the malformed inline code by replacing
the broken "using or " fragment with explicit backticked `.find()` /
`.filter()`; ensure the Action example still shows `new Map(items.map(i =>
[i.id, i]))` and that the section is grammatically intact.
Source: Linters/SAST tools
| const speakersMap = await getSpeakersMap(year); | ||
| const result: Speaker[] = []; | ||
| speakerIds.forEach((id) => { | ||
| const speaker = speakersMap.get(id); | ||
| if (speaker) { | ||
| result.push(speaker); | ||
| } | ||
| }); | ||
| return result; |
There was a problem hiding this comment.
Deduplicate speakerIds during map lookup to avoid duplicate speaker entries.
Line 144-149 now pushes per ID directly; if speakerIds contains duplicates, the returned Speaker[] will duplicate entries (previous Set-based behavior implicitly deduped).
Suggested patch
export const getTalkSpeakersWithDetails = async (year: string | number, speakerIds: string[]): Promise<Speaker[]> => {
const speakersMap = await getSpeakersMap(year);
const result: Speaker[] = [];
- speakerIds.forEach((id) => {
+ const seen = new Set<string>();
+ speakerIds.forEach((id) => {
+ if (seen.has(id)) return;
+ seen.add(id);
const speaker = speakersMap.get(id);
if (speaker) {
result.push(speaker);
}
});
return result;
};📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| const speakersMap = await getSpeakersMap(year); | |
| const result: Speaker[] = []; | |
| speakerIds.forEach((id) => { | |
| const speaker = speakersMap.get(id); | |
| if (speaker) { | |
| result.push(speaker); | |
| } | |
| }); | |
| return result; | |
| const speakersMap = await getSpeakersMap(year); | |
| const result: Speaker[] = []; | |
| const seen = new Set<string>(); | |
| speakerIds.forEach((id) => { | |
| if (seen.has(id)) return; | |
| seen.add(id); | |
| const speaker = speakersMap.get(id); | |
| if (speaker) { | |
| result.push(speaker); | |
| } | |
| }); | |
| return result; |
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@hooks/useTalks.ts` around lines 142 - 150, Deduplicate speakerIds before
looking them up so duplicate IDs don't produce repeated Speaker entries: in the
block that calls getSpeakersMap(year) and iterates over speakerIds (referencing
speakersMap, speakerIds, and the result: Speaker[] array), convert speakerIds to
a Set or otherwise filter for unique IDs, then iterate that unique list, look up
each id in speakersMap, and push non-null speakers to result before returning;
this preserves the original lookup logic but prevents duplicates.
Replaces O(N) array filtering with O(1) Map lookups for resolving talk speakers. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
1 participant
💡 What: Replaced linear array traversals ($O(1)$ Map lookup by introducing the memoized
.find()and.filter()) with angetSpeakersMapfunction inhooks/useSpeakers.ts.🎯 Why: To significantly reduce the time complexity of resolving speaker details for talks, especially during static site generation or high-traffic periods where hundreds of talks map to hundreds of speakers. The previous implementation ran an$O(N)$ filter operation over the entire speaker list for every single talk.
📊 Impact: Reduces the time complexity of$O(N)$ to $O(1)$ . When generating static pages for hundreds of talks, this avoids tens of thousands of redundant array iterations, reducing CPU usage and GC overhead during the build process and API responses.
getSpeakerByYearAndIdandgetTalkSpeakersWithDetailsfrom🔬 Measurement: Verified by running the test suite and building the Next.js application (
npm run build). The build correctly generated all 1500+ static pages without regressions.PR created automatically by Jules for task 13962519704054931994 started by @anyulled
Summary by CodeRabbit