feat: [performance improvement] optimize navigation lookups#286
feat: [performance improvement] optimize navigation lookups#286anyulled wants to merge 2 commits into
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…1) object access Replace O(n) `Object.entries(x).find()` array operations with O(1) direct object property access in `lib/shared/navigation.ts` to improve performance during navigation processing. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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Estimated code review effort🎯 1 (Trivial) | ⏱️ ~3 minutes Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches🧪 Generate unit tests (beta)
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Code Review
This pull request optimizes lookup operations in lib/shared/navigation.ts by replacing O(N) linear searches over Object.entries with O(1) direct object lookups, and documents this best practice in .jules/bolt.md. The review feedback highlights that the type assertions (as keyof typeof ...) used in both the code and the documentation are redundant and potentially unsafe, suggesting direct property access instead.
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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 here. Since cfpData is explicitly typed as Record<string, CfpTrack[]> and year is already of type string, TypeScript can resolve the property access directly without any casting. Removing the type assertion simplifies the code and improves readability.
| 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 guaranteed to be of type NavCondition (due to the if (!link.condition) guard on line 41), TypeScript can safely resolve the property access directly. Removing the assertion makes the code cleaner.
| const conditionValue = conditions[link.condition as keyof typeof conditions]; | |
| const conditionValue = conditions[link.condition]; |
| ## 2024-05-19 - Replace O(N) array find over Object.entries with O(1) object lookup | ||
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| **Learning:** When retrieving a value from an object based on a key matching a string, using `Object.entries(obj).find(([k]) => k === target)?.[1]` creates an unnecessary array of all key-value pairs (O(N) memory and time) and performs a linear search (O(N) time). | ||
| **Action:** Always use direct object property access `obj[target as keyof typeof obj]` for O(1) time and space complexity, which is significantly faster and cleaner. |
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Recommending as keyof typeof obj as a blanket rule can be misleading and potentially unsafe. If the object has an index signature (like Record<string, T>) or if the key is already correctly typed, the type assertion is redundant. Furthermore, using as keyof typeof obj forces TypeScript to treat any string as a valid key, which can mask potential runtime errors (e.g., accessing a non-existent property and getting undefined when the compiler expects a defined value). It is better to recommend direct property access obj[target] and only use type assertions when strictly necessary.
| **Action:** Always use direct object property access `obj[target as keyof typeof obj]` for O(1) time and space complexity, which is significantly faster and cleaner. | |
| **Action:** Always use direct object property access obj[target] (or with a safe type assertion if strictly required) for O(1) time and space complexity, which is significantly faster and cleaner. |
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…1) object access Replace O(n) `Object.entries(x).find()` array operations with O(1) direct object property access in `lib/shared/navigation.ts` to improve performance during navigation processing. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
1 participant
💡 What: Replaced two instances of
Object.entries(obj).find(([k]) => k === target)?.[1]with directobj[target as keyof typeof obj]lookups inlib/shared/navigation.ts.🎯 Why: The previous approach was inefficient as it dynamically created an array of key-value pairs (O(N) memory allocation overhead) and then performed a linear array search (O(N) time complexity) for simple property access. This occurred inside the navigation link filtering process, meaning the O(N) allocation and search was happening repeatedly per link filter map.
📊 Impact: Transforms lookup time and space complexity from O(N) to O(1), completely eliminating unnecessary array allocations and garbage collection overhead during navigation processing.
🔬 Measurement: Verify tests still pass (
npm run test) andnpm run lintyields no regressions, confirming safe retrieval of properties.PR created automatically by Jules for task 16649219380798348421 started by @anyulled
Summary by CodeRabbit
Refactor
Documentation