feat: [performance improvement]#285
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…ct lookup in navigation.ts Replaces O(N) `Object.entries(obj).find` iterations with O(1) direct property access (`obj[key]`) in `lib/shared/navigation.ts` to reduce memory allocations and improve layout execution speed. 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 simplifies property lookups in lib/shared/navigation.ts by replacing complex Object.entries().find() lookups with direct property access. The feedback points out that the type assertions used during these lookups are redundant and suggests cleaner, direct property access without casting.
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| const editionCfp = Object.entries(cfpData).find(([y]) => y === year)?.[1]; | ||
| const editionCfp = cfpData[year as keyof typeof cfpData]; |
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The type assertion as keyof typeof cfpData is redundant. Since cfpData is defined as Record<string, CfpTrack[]> and year is of type string, you can perform direct property access without any type casting.
| const editionCfp = cfpData[year as keyof typeof cfpData]; | |
| const editionCfp = cfpData[year]; |
| .filter((link) => { | ||
| if (!link.condition) return true; | ||
| const conditionValue = Object.entries(conditions).find(([key]) => key === link.condition)?.[1]; | ||
| const conditionValue = conditions[link.condition as keyof typeof conditions]; |
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The type assertion as keyof typeof conditions is redundant. Since conditions is typed as Record<NavCondition, boolean> and link.condition is of type NavCondition (guaranteed by the non-nullability check on line 41), you can access the property directly without casting.
| const conditionValue = conditions[link.condition as keyof typeof conditions]; | |
| const conditionValue = conditions[link.condition]; |
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💡 What: Replaced
Object.entries(obj).find(([key]) => key === target)?.[1]with direct O(1) property accessobj[target as keyof typeof obj]inlib/shared/navigation.tsfor bothcfpDataandconditions.🎯 Why: To eliminate unnecessary array allocations (
Object.entriescreates a new array of arrays) and avoid linear O(N) search times during layout and navigation rendering, which happens frequently.📊 Impact: Reduces amortized O(N) operations to strictly O(1), lowering GC overhead and slightly improving server-side render times for navigation links across all pages.
🔬 Measurement: The Next.js build completed quickly, and
npm run testandnpm run lintpass successfully without regressions. The code continues to handle missing keys gracefully by returningundefined.PR created automatically by Jules for task 6628073051213857732 started by @anyulled