⚡ Bolt: Optimize array allocations in CSV parsing - #4346
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Replaced `.map()` call on CSV headers with a pre-allocated array and single-pass `for` loop to eliminate an intermediate garbage collection event and closure execution. Co-authored-by: dieterolson <198168927+dieterolson@users.noreply.github.com>
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| const header = rows[0].map((h) => h.trim()); | ||
| const headerRow = rows[0]; | ||
| const colCount = headerRow.length; | ||
| // ⚡ Bolt Optimization: Replace rows[0].map with single-pass loop |
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This comment merely restates the implementation and records the replaced .map() expression, so it adds no rationale and can become stale if the loop changes. Replace it with the performance reason this initialization requires a manual loop, or remove it.
AGENTS.md reference: AGENTS.md:L193-L195
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Consolidated into #4408. Closing to reduce CI/CD runner load. |
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💡 What: Replaced
.map()call on CSV headers with a pre-allocated array and single-passforloop.🎯 Why: Calling array methods like
.map()incurs unnecessary closure and function call overhead and intermediate array allocation.📊 Impact: Eliminates an intermediate garbage collection event and closure execution during CSV parsing setup.
🔬 Measurement: Observe heap allocation profiles when initializing Data Explorer datasets; closure and array allocations will decrease.
PR created automatically by Jules for task 8774832451639572971 started by @dieterolson