feat: [performance improvement]#321
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Replaces O(n) array lookups with an O(1) Map lookup inside `getSpeakerByYearAndId` to prevent redundant O(N) array traversals across repeated component renders. 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 speaker lookups in hooks/useSpeakers.ts by introducing a cached Map (getSpeakersMap) to achieve O(1) lookup complexity instead of repeatedly calling .find(), and documents this pattern in .jules/bolt.md. The reviewer suggests adding a strict mode option to getSpeakerByYearAndId and propagating it to getSpeakersMap and getSpeakers to ensure that data fetching failures during the build process correctly trigger build failures.
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| 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])); | ||
| }); | ||
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| export const getSpeakerByYearAndId = async (year: string | number, speakerId: string): Promise<Speaker | undefined> => { | ||
| const speakersMap = await getSpeakersMap(year); | ||
| return speakersMap.get(speakerId); | ||
| }; |
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According to the general rules, data fetching functions used during the build process (such as getSpeakerByYearAndId which is called in generateMetadata and page components during static generation) should support 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.
We should add an optional options parameter with strict to getSpeakerByYearAndId and propagate it to getSpeakersMap (passing it as a primitive boolean to avoid React cache object-identity cache misses) and then to getSpeakers.
const getSpeakersMap = cache(async (year: string | number, strict?: boolean): Promise<Map<string, Speaker>> => {
const speakers = await getSpeakers(year, { strict });
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?.strict);
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.
PR Summary by QodoOptimize speaker lookup with cached Map index
AI Description
Diagram
High-Level Assessment
Files changed (2)
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Code Review by Qodo
Context used✅ Compliance rules (platform):
11 rules 1. Eager Map build overhead
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1 participant
💡 What: Refactored
getSpeakerByYearAndIdto use aMapwrapped in React'scache()for lookups.🎯 Why:
getSpeakerByYearAndIdis often called repeatedly (e.g. within lists or dynamic routes). Calling.find()on a large array of speakers inside these iterations incurs an O(N) penalty every time. Building a map once per fetch and pulling from it offers O(1) lookups, preventing redundant iterations and unnecessary Garbage Collection overhead. JSDoc comments were also stripped per persona requirements.📊 Impact: Lookup time complexity drops from O(N) to O(1) for all calls following the initial O(N) map generation. This vastly improves performance when looking up multiple individual speakers in a single render pass.
🔬 Measurement: Verify via Next.js render times for routes generating lists or sets of speakers. Local test suite
__tests__/hooks_performance.test.tsand__tests__/hooks.test.tspass, maintaining correct cache behavior and expected functionality.PR created automatically by Jules for task 4238887834633890372 started by @anyulled