feat: [performance improvement] optimize getSpeakerByYearAndId with Map lookup#297
feat: [performance improvement] optimize getSpeakerByYearAndId with Map lookup#297anyulled wants to merge 2 commits into
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ChangesSpeaker lookup optimization
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Code Review
This pull request optimizes the getSpeakerByYearAndId function by introducing a cached Map lookup instead of performing an O(n) array traversal with .find(), and documents this pattern in .jules/bolt.md. The review feedback recommends avoiding intermediate array allocations when constructing the Map by using a loop instead of .map() in both the implementation and the documentation.
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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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While using a Map lookup is a great O(1) optimization, using speakers.map(...) inside the Map constructor creates an intermediate array of [key, value] tuples for every speaker. This introduces unnecessary memory allocations and garbage collection overhead, which contradicts the optimization principles documented in .jules/bolt.md (e.g., avoiding unnecessary allocations).
We can construct the Map using a simple loop to avoid any intermediate array allocations.
const getSpeakersMap = cache(async (year: string | number): Promise<Map<string, Speaker>> => {
const speakers = await getSpeakers(year);
const speakersMap = new Map<string, Speaker>();
for (const speaker of speakers) {
speakersMap.set(speaker.id, speaker);
}
return speakersMap;
});|
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| ## 2024-06-26 — Optimize getSpeakerByYearAndId with Map Lookups | ||
| **Learning:** In a codebase frequently querying speaker configurations (like via `getSpeakerByYearAndId`), standard array traversals via `.find()` introduce O(n) amortized overhead upon multiple lookups. | ||
| **Action:** Always wrap lists generated from repeated queries in a React `cache()` wrapped generic map generator (e.g. `const map = new Map(arr.map(a => [a.id, a]))`) to facilitate amortized O(1) property access. |
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To align with the goal of minimizing memory allocations and GC overhead (as noted in the first learning entry), we should avoid using arr.map(a => [a.id, a]) when constructing the Map. This creates N intermediate tuple arrays. Instead, we should recommend populating the Map using a loop or forEach.
| **Action:** Always wrap lists generated from repeated queries in a React `cache()` wrapped generic map generator (e.g. `const map = new Map(arr.map(a => [a.id, a]))`) to facilitate amortized O(1) property access. | |
| **Action:** Always wrap lists generated from repeated queries in a React cache() wrapped generic map generator (e.g. populate a new Map via a loop) to facilitate amortized O(1) property access without intermediate array allocations. |
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Actionable comments posted: 1
🤖 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:
- Line 8: The note wording in the guidance should use the compound modifier
“cache()-wrapped” for clarity. Update the text referenced by the repeated-query
map generator instruction so that the phrase around React cache usage reads as
“React `cache()`-wrapped generic map generator,” keeping the rest of the
guidance unchanged.
🪄 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
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📒 Files selected for processing (2)
.jules/bolt.mdhooks/useSpeakers.ts
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| ## 2024-06-26 — Optimize getSpeakerByYearAndId with Map Lookups | ||
| **Learning:** In a codebase frequently querying speaker configurations (like via `getSpeakerByYearAndId`), standard array traversals via `.find()` introduce O(n) amortized overhead upon multiple lookups. | ||
| **Action:** Always wrap lists generated from repeated queries in a React `cache()` wrapped generic map generator (e.g. `const map = new Map(arr.map(a => [a.id, a]))`) to facilitate amortized O(1) property access. |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
Hyphenate cache()-wrapped in the note.
Line 8 reads cleaner as a compound modifier, e.g. React `cache()`-wrapped generic map generator.
Suggested edit
-**Action:** Always wrap lists generated from repeated queries in a React `cache()` wrapped generic map generator (e.g. `const map = new Map(arr.map(a => [a.id, a]))`) to facilitate amortized O(1) property access.
+**Action:** Always wrap lists generated from repeated queries in a React `cache()`-wrapped generic map generator (e.g. `const map = new Map(arr.map(a => [a.id, a]))`) to facilitate amortized O(1) property access.📝 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.
| **Action:** Always wrap lists generated from repeated queries in a React `cache()` wrapped generic map generator (e.g. `const map = new Map(arr.map(a => [a.id, a]))`) to facilitate amortized O(1) property access. | |
| **Action:** Always wrap lists generated from repeated queries in a React `cache()`-wrapped generic map generator (e.g. `const map = new Map(arr.map(a => [a.id, a]))`) to facilitate amortized O(1) property access. |
🧰 Tools
🪛 LanguageTool
[grammar] ~8-~8: Use a hyphen to join words.
Context: ...om repeated queries in a React cache() wrapped generic map generator (e.g. `con...
(QB_NEW_EN_HYPHEN)
🤖 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 at line 8, The note wording in the guidance should use the
compound modifier “cache()-wrapped” for clarity. Update the text referenced by
the repeated-query map generator instruction so that the phrase around React
cache usage reads as “React `cache()`-wrapped generic map generator,” keeping
the rest of the guidance unchanged.
Source: Linters/SAST tools
1 participant
💡 What: Replaced array
.find()with a Map lookup ingetSpeakerByYearAndId.🎯 Why: Replaced an O(N) lookup with an O(1) Map lookup.
📊 Impact: Converts the amortized time complexity of fetching speaker details to O(1), improving render performance.
🔬 Measurement: Observe reduction in array traversal times during page renders.
PR created automatically by Jules for task 17360583596143430945 started by @anyulled
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