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Benchmark created on November 20, 2025

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};

Test runner

function isResourceKey(
  resource,
  key
) {
  return key in resource;
}


function mergeIgnoreNil(dst, src) {
  if (!dst || !src) {
    return dst ?? src;
  }

  const dstCopy = { ...dst };
  const srcCopy = { ...src };

  for (const [keyB, valueB] of Object.entries(src)) {
    if (isResourceKey(src, keyB) && (valueB === undefined || valueB === null)) {
      // srcCopy is just a shallow copy of src, so it should be of the
      // same type as src, i.e. SrcType
      delete srcCopy[keyB];
    }

    const valueA = Object.getOwnPropertyDescriptor(dstCopy, keyB)?.value;
    if (
      valueB &&
      valueA &&
      typeof valueB === 'object' &&
      typeof valueA === 'object' &&
      !Array.isArray(valueB) &&
      !Array.isArray(valueA)
    ) {
      Object.assign(srcCopy, { [keyB]: mergeIgnoreNil(valueA, valueB) });
    }
  }
  return { ...dstCopy, ...srcCopy };
}

mergeIgnoreNil(dst,src);

function mergeIgnoreNil(dst, src) {
  if (!dst || !src) {
    return dst ?? src;
  }

  const result = { ...dst };
  const srcKeys = Object.keys(src);

  for (let i = 0; i < srcKeys.length; i++) {
    const keyB = srcKeys[i];
    const valueB = src[keyB];

    // Skip nil values for resource keys
    if (valueB === undefined || valueB === null) {
      continue;
    }

    const valueA = result[keyB];

    // Recursively merge nested objects
    if (
      valueB &&
      valueA &&
      typeof valueB === 'object' &&
      typeof valueA === 'object' &&
      !Array.isArray(valueB) &&
      !Array.isArray(valueA)
    ) {
      result[keyB] = mergeIgnoreNil(valueA, valueB);
    } else {
      result[keyB] = valueB;
    }
  }
  return result;
}

mergeIgnoreNil(dst, src)

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

• Revision 1: published on November 20, 2025