feat: [performance improvement] Optimize saved session lookups in ScheduleContainer#238
feat: [performance improvement] Optimize saved session lookups in ScheduleContainer#238anyulled wants to merge 3 commits into
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…eduleContainer - Convert `savedSessionIds` array to a `Set` before filtering sessions. - Using `.includes()` inside `.filter()` results in an O(N*M) time complexity. Using a `Set` improves this to O(N+M), preventing performance bottlenecks when users have many saved sessions. 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 improves performance in ScheduleContainer.tsx by converting savedSessionIds to a Set to optimize filtering from O(N*M) to O(N+M). It also adds a corresponding entry to the .jules/bolt.md documentation. Feedback was provided regarding the documentation entry, which incorrectly used literal newline characters (\n) instead of actual line breaks, potentially breaking the markdown rendering.
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| **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); }`). | ||
| ## 2024-05-25 - Avoid array includes inside array filter operations\n\n**Learning:** In Next.js/React applications, when filtering a list of items based on their presence in another array (e.g., `savedSessionIds.includes(s.id)` inside a `filter` function), it leads to an O(N * M) time complexity. This can cause performance bottlenecks and block the main thread, especially if the arrays are large.\n**Action:** Convert the lookup array into a `Set` before the filtering loop. Use `set.has(id)` inside the `filter` function to achieve O(N + M) time complexity. |
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The new entry in the markdown file contains literal \n characters instead of actual newlines. This will cause the text to be rendered as a single line with visible \n strings rather than properly formatted markdown blocks. It should follow the multi-line format used in the previous entry for consistency and readability.
| ## 2024-05-25 - Avoid array includes inside array filter operations\n\n**Learning:** In Next.js/React applications, when filtering a list of items based on their presence in another array (e.g., `savedSessionIds.includes(s.id)` inside a `filter` function), it leads to an O(N * M) time complexity. This can cause performance bottlenecks and block the main thread, especially if the arrays are large.\n**Action:** Convert the lookup array into a `Set` before the filtering loop. Use `set.has(id)` inside the `filter` function to achieve O(N + M) time complexity. | |
| ## 2024-05-25 - Avoid array includes inside array filter operations | |
| **Learning:** In Next.js/React applications, when filtering a list of items based on their presence in another array (e.g., `savedSessionIds.includes(s.id)` inside a `filter` function), it leads to an O(N * M) time complexity. This can cause performance bottlenecks and block the main thread, especially if the arrays are large. | |
| **Action:** Convert the lookup array into a `Set` before the filtering loop. Use `set.has(id)` inside the `filter` function to achieve O(N + M) time complexity. |
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Actionable comments posted: 1
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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In @.jules/bolt.md:
- Line 5: Replace the literal escaped newline sequence `\n\n` in the markdown
heading text "2024-05-25 - Avoid array includes inside array filter operations"
with real line breaks (actual blank lines) so the content is rendered as
separate paragraphs; edit the .jules/bolt.md entry to remove the
backslash-escaped `\n\n` and insert actual newlines between the lines of the
heading, Learning, and Action sections to satisfy Prettier and fix rendering.
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Fix all unresolved CodeRabbit comments on this PR:
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📒 Files selected for processing (2)
.jules/bolt.mdcomponents/schedule/ScheduleContainer.tsx
…eduleContainer - Convert `savedSessionIds` array to a `Set` before filtering sessions. - Using `.includes()` inside `.filter()` results in an O(N*M) time complexity. Using a `Set` improves this to O(N+M), preventing performance bottlenecks when users have many saved sessions. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
…eduleContainer - Convert `savedSessionIds` array to a `Set` before filtering sessions. - Using `.includes()` inside `.filter()` results in an O(N*M) time complexity. Using a `Set` improves this to O(N+M), preventing performance bottlenecks when users have many saved sessions. - Formatted .jules/bolt.md to fix Prettier CI check. Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
1 participant
💡 What: Convert
savedSessionIdsarray to aSetbefore filtering sessions.🎯 Why: Using
.includes()inside.filter()results in an O(N*M) time complexity. Using aSetimproves this to O(N+M), preventing performance bottlenecks when users have many saved sessions.📊 Impact: Reduces time spent filtering schedule sessions, preventing main thread blocking and ensuring smoother re-renders when toggling "My Schedule".
🔬 Measurement: Verify by saving multiple sessions and toggling the "My Schedule" filter. Profiling the React render will show reduced time in
useMemo.PR created automatically by Jules for task 11304026006692388371 started by @anyulled
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