⚡ Bolt: optimize groupTalksByTrack memory allocation#208
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📝 WalkthroughWalkthroughThe ChangesTalk Grouping Refactoring
Estimated code review effort🎯 1 (Trivial) | ⏱️ ~3 minutes Possibly related PRs
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Code Review
This pull request refactors the groupTalksByTrack function to use a Map and iterative approach instead of reduce with object spreading, which significantly improves performance and memory efficiency. The review feedback suggests further optimizing the implementation by replacing forEach with a for...of loop to eliminate the overhead of per-iteration function calls and closures.
| talks.forEach((talk) => { | ||
| const track = getTrackFromTalk(talk); | ||
| return { | ||
| ...acc, | ||
| [track]: [...(acc[track] || []), talk], | ||
| }; | ||
| }, {}); | ||
| const existing = map.get(track); | ||
| if (!existing) { | ||
| map.set(track, [talk]); | ||
| } else { | ||
| existing.push(talk); | ||
| } | ||
| }); |
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While forEach is functional, using a for...of loop is generally more performant in JavaScript/TypeScript as it avoids the overhead of creating a closure for each iteration. Given that this PR specifically aims to optimize memory allocation and reduce Garbage Collector pressure, switching to for...of would further align with those goals by eliminating the per-iteration function call and potential minor allocations associated with the callback.
| talks.forEach((talk) => { | |
| const track = getTrackFromTalk(talk); | |
| return { | |
| ...acc, | |
| [track]: [...(acc[track] || []), talk], | |
| }; | |
| }, {}); | |
| const existing = map.get(track); | |
| if (!existing) { | |
| map.set(track, [talk]); | |
| } else { | |
| existing.push(talk); | |
| } | |
| }); | |
| for (const talk of talks) { | |
| const track = getTrackFromTalk(talk); | |
| const existing = map.get(track); | |
| if (!existing) { | |
| map.set(track, [talk]); | |
| } else { | |
| existing.push(talk); | |
| } | |
| } |
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💡 What: Replaced the
reduce+ array spread syntax ingroupTalksByTrack(hooks/useTalks.ts) with aforEachloop and aMapthat mutates local arrays using.push().🎯 Why: In Next.js/React, using the array spread operator (
[...existing, item]) inside a loop over a large dataset creates a new array object for each iteration. This causes amortized O(N^2) memory allocations and unnecessary Garbage Collection overhead during static generation and runtime rendering.📊 Impact: Significantly reduces memory allocation and Garbage Collector pressure when grouping hundreds of talks by track. Time complexity drops from O(N^2) to amortized O(N) for array insertions.
🔬 Measurement: Verified that the schedule rendering, talk filtering, and tests (
npm run test) continue to function without errors or regressions. Memory profiling on large collections would show fewer heap allocations.PR created automatically by Jules for task 8128148064335296609 started by @anyulled
Summary by CodeRabbit