⚡ Bolt: optimize derived statistics calculation in SongEditor#49
⚡ Bolt: optimize derived statistics calculation in SongEditor#49imLeGEnDco55 wants to merge 1 commit into
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Replaces multiple array passes (`filter`, `reduce`) with a single imperative loop wrapped in a `useMemo` block. This prevents unnecessary O(N) recalculations of total syllables and lyric line counts during high-frequency component re-renders triggered by audio `timeupdate` events. Co-authored-by: imLeGEnDco55 <210333019+imLeGEnDco55@users.noreply.github.com>
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Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request enhances the performance of the Highlights
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Code Review
This pull request correctly identifies and fixes a performance issue in SongEditor.tsx by memoizing the calculation of derived statistics. The use of useMemo with a single loop is a significant improvement over the previous chained array methods that ran on every render. I have one suggestion to further refine the implementation by using a reduce function, which would make the code more declarative while maintaining the performance benefits.
| const { totalSyllables, lyricLineCount } = useMemo(() => { | ||
| let syllables = 0; | ||
| let count = 0; | ||
| const lyricsLength = song.lyrics.length; | ||
| for (let i = 0; i < lyricsLength; i++) { | ||
| const line = song.lyrics[i]; | ||
| if (line.type !== "prompt") { | ||
| syllables += line.syllableCount; | ||
| count++; | ||
| } | ||
| } | ||
| return { totalSyllables: syllables, lyricLineCount: count }; | ||
| }, [song.lyrics]); |
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Great job on optimizing this calculation with useMemo! While the imperative loop is correct and performant, you could consider using a single reduce operation. This would achieve the same single-pass efficiency in a more declarative, functional style, which can be easier to read and reason about.
const { totalSyllables, lyricLineCount } = useMemo(() => {
return song.lyrics.reduce((stats, line) => {
if (line.type !== "prompt") {
stats.totalSyllables += line.syllableCount;
stats.lyricLineCount++;
}
return stats;
}, { totalSyllables: 0, lyricLineCount: 0 });
}, [song.lyrics]);
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💡 What: Replaced the chained
filter()andreduce()methods used to calculatetotalSyllablesandlyricLineCountinSongEditor.tsxwith a single imperative loop inside auseMemoblock.🎯 Why:
SongEditorre-renders frequently due to audio playback state changes (specificallytimeupdateevents). The previous implementation iterated over thesong.lyricsarray multiple times on every render, creating intermediate arrays and performing redundant calculations even when the lyrics hadn't changed.📊 Impact: Reduces O(N) array processing and intermediate object allocations to O(1) during active playback, as the calculations are now safely memoized and only re-run when
song.lyricsactually mutates.🔬 Measurement: Verified that the component still correctly tracks syllable counts and line counts when lyrics are edited, while the computations are bypassed during standard audio playback. Verified safety via
pnpm lintandpnpm test.PR created automatically by Jules for task 16321464221875115166 started by @imLeGEnDco55