feat: [performance improvement]#294
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Replaced inefficient `Object.entries(obj).find(...)` iteration patterns with direct `obj[key]` lookups in the navigation parsing logic to avoid intermediate array allocation and reduce lookup complexity from O(N) to O(1). 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 dictionary lookups in lib/shared/navigation.ts by replacing linear searches with direct property lookups, and documents this performance learning in .jules/bolt.md. The review feedback recommends removing a duplicated entry in the documentation file and simplifying the TypeScript code by removing a redundant type cast.
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| ## 2024-05-18 - Avoid array spreads inside loops for Map grouping | ||
| **Learning:** In Next.js/React applications, when grouping items (like schedules or talks) into a `Map` where the values are arrays, using the array spread operator `[...existing, item]` inside a loop (like `forEach` or `map`) causes amortized O(N^2) memory allocations and unnecessary Garbage Collection overhead. | ||
| **Action:** Always use `.push()` on the existing array reference if the data structure permits local mutation. For strict ESLint configurations enforcing `no-restricted-syntax`, extract the existing array, push to it, and handle the fallback elegantly (`if (!existing) { map.set(key, [item]); } else { existing.push(item); }`). | ||
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| ## 2024-06-23 - Fast Dictionary Lookups | ||
| **Learning:** In Next.js/React applications, when looking up static configuration values from objects, using `Object.entries(obj).find(([key]) => key === target)?.[1]` introduces unnecessary array allocations and linear search overhead. | ||
| **Action:** Use direct property lookups `obj[target]` (with appropriate typescript type casts if necessary like `target as keyof typeof obj`) for O(1) performance and clearer, less-allocating code. |
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The section ## 2024-05-18 - Avoid array spreads inside loops for Map grouping is duplicated. It is already present at the top of the file (lines 1-4). Please remove the duplicate entry to keep the file clean.
| ## 2024-05-18 - Avoid array spreads inside loops for Map grouping | |
| **Learning:** In Next.js/React applications, when grouping items (like schedules or talks) into a `Map` where the values are arrays, using the array spread operator `[...existing, item]` inside a loop (like `forEach` or `map`) causes amortized O(N^2) memory allocations and unnecessary Garbage Collection overhead. | |
| **Action:** Always use `.push()` on the existing array reference if the data structure permits local mutation. For strict ESLint configurations enforcing `no-restricted-syntax`, extract the existing array, push to it, and handle the fallback elegantly (`if (!existing) { map.set(key, [item]); } else { existing.push(item); }`). | |
| ## 2024-06-23 - Fast Dictionary Lookups | |
| **Learning:** In Next.js/React applications, when looking up static configuration values from objects, using `Object.entries(obj).find(([key]) => key === target)?.[1]` introduces unnecessary array allocations and linear search overhead. | |
| **Action:** Use direct property lookups `obj[target]` (with appropriate typescript type casts if necessary like `target as keyof typeof obj`) for O(1) performance and clearer, less-allocating code. | |
| ## 2024-06-23 - Fast Dictionary Lookups | |
| **Learning:** In Next.js/React applications, when looking up static configuration values from objects, using Object.entries(obj).find(([key]) => key === target)?.[1] introduces unnecessary array allocations and linear search overhead. | |
| **Action:** Use direct property lookups obj[target] (with appropriate typescript type casts if necessary like target as keyof typeof obj) for O(1) performance and clearer, less-allocating code. |
| .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 cast as keyof typeof conditions is redundant here. Since conditions is explicitly typed as Record<NavCondition, boolean> and link.condition is narrowed to NavCondition (after the !link.condition check), TypeScript already knows that link.condition is a valid key of conditions. Removing the cast simplifies the code.
| const conditionValue = conditions[link.condition as keyof typeof conditions]; | |
| const conditionValue = conditions[link.condition]; |
Replaced inefficient `Object.entries(obj).find(...)` iteration patterns with direct `obj[key]` lookups in the navigation parsing logic to avoid intermediate array allocation and reduce lookup complexity from O(N) to O(1). Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
1 participant
💡 What:
Replaced
Object.entries(obj).find(([key]) => key === condition)?.[1]with direct property accessobj[condition as keyof typeof obj]inlib/shared/navigation.ts.🎯 Why:
To prevent unnecessary creation of arrays (via
Object.entries) and eliminate the linear O(N) lookup time, optimizing the static rendering pathways for navigation.📊 Impact:
Reduces garbage collection overhead by eliminating temporary arrays per loop iteration and reduces execution time of navigation filtering from O(N) to O(1) complexity per lookup.
🔬 Measurement:
Run
npm run test -- __tests__/lib/shared/navigation.test.tsto ensure navigation conditions are still parsed and executed correctly, and review code to verify linear iterations have been removed.PR created automatically by Jules for task 12829591693744384201 started by @anyulled