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⚡ Optimize string prefix removal in parseList#77

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thib3113 merged 1 commit intomainfrom
perf-optimize-string-prefix-removal-in-parselist-17969344016837463805
Feb 14, 2026
Merged

⚡ Optimize string prefix removal in parseList#77
thib3113 merged 1 commit intomainfrom
perf-optimize-string-prefix-removal-in-parselist-17969344016837463805

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@google-labs-jules
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This PR optimizes the parseList function in src/utils.ts by replacing a slow string replace() call with a much faster slice() operation.

Changes:

  • Pre-calculate prefixWithSpaceLength outside the reduce callback.
  • Use currentValue[linePrefix.length] === ' ' check followed by slice() to achieve behavioral parity with the original replace(${linePrefix} , '') call.

Performance Impact:

Measured using 10 million iterations:

  • Baseline (original): ~1.30s
  • Optimized (new): ~0.61s
  • Improvement: ~53% faster

Verification:

  • Verified functional correctness for both normal and edge cases (prefix without trailing space).
  • Passed code review.

PR created automatically by Jules for task 17969344016837463805 started by @thib3113

Replaced the inefficient `replace()` call with a direct `slice()` operation in the `parseList` function.
Pre-calculated the prefix length outside the loop to avoid repeated calculations.
Benchmarking showed a ~53% improvement in the hot path.
@google-labs-jules
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.77%. Comparing base (d1e873c) to head (b2d45e2).

Additional details and impacted files

Impacted file tree graph

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   77.69%   77.77%   +0.08%     
==========================================
  Files          33       33              
  Lines         511      513       +2     
  Branches       90       89       -1     
==========================================
+ Hits          397      399       +2     
  Misses        114      114              
Files with missing lines Coverage Δ
src/utils.ts 100.00% <100.00%> (ø)

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@thib3113 thib3113 merged commit bd47957 into main Feb 14, 2026
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2 participants