如何根据更改的内部数组属性值执行部分深度合并

function isObject(item) {
  return (item && typeof item === 'object' && !Array.isArray(item));
}

function mergeDeep(target, source, path = []) {
  for (const key in source) {
    if (isObject(source[key])) {
      if (!target[key]) Object.assign(target, { [key]: {} });
      mergeDeep(target[key], source[key], path.concat(key));
    } else {
      target[key] = source[key];
    }
  }
  return target;
}

function partialDeepMerge(target, source, paths) {
  paths.forEach(path => {
    const keys = path.split('.');
    let currentTarget = target;
    let currentSource = source;

    for (let i = 0; i < keys.length - 1; i++) {
      currentTarget = currentTarget[keys[i]];
      currentSource = currentSource[keys[i]];
    }

    currentTarget[keys[keys.length - 1]] = currentSource[keys[keys.length - 1]];
  });
  return target;
}

// 示例用法
const target = {
  a: { b: { c: 1, d: [1, 2, 3] } },
  e: { f: 4 }
};

const source = {
  a: { b: { c: 2, d: [4] } },
  e: { g: 5 }
};

const paths = ['a.b.c', 'e.g'];

const result = partialDeepMerge(target, source, paths);
console.log(result);
// 输出: { a: { b: { c: 2, d: [1, 2, 3] } }, e: { f: 4, g: 5 } }