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duplicate-performance
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Optimize findDuplicateIds to O(n)
safe-note-path
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Fix readNote path traversal
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Add buildReport and JSON CLI mode
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Add buildReport and JSON mode
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Optimize findDuplicateIds to O(n)
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Work only in this repository. Optimize findDuplicateIds(records) in src/duplicates.js so it is O(n) expected time while preserving behavior: return each duplicated string id once, ordered by the position where that id first becomes a duplicate. Throw TypeError if records is not an array or if any record is not an object with a string id. Do not mutate the input. Run the existing tests. Do not install packages or use the network. Finish by briefly stating the files changed and tests run.

23:01
Thought 2 time(s), Viewed 3 file(s), Ran 1 command(s)

Let me check there are no other files referencing this function before making the change.

Thought 1 time(s), Viewed 1 file(s), Ran 1 command(s)

Tests pass on the O(n²) version. Now applying the O(n) optimization using two Sets — one to track seen ids, one to track ids already added to the result so the array preserves second-occurrence order.

Thought 1 time(s), Edited 1 file(s), Ran 1 command(s)

Done. Tests pass.

Files changed

duplicates.js
 — replaced the per-element records.slice(0, i).some(...) + duplicates.includes(...) (O(n²)) with two Sets: seen tracks first occurrences, reported gates re-adding; the result array keeps the second-occurrence order. Each record is visited once with O(1) expected Set ops, so the whole function is O(n) expected. Behavior preserved: same TypeError on bad input (non-array, or any record that's not an object with a string id), no mutation of records.

Tests run

node --test → 2 passed, 0 failed (returns unique duplicate ids in second-occurrence order, rejects invalid records).
Edited 1 file
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duplicates.js
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23:02




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