如何对对象进行深度过滤(搜索)？

function deepFilter(obj, predicate) {
  if (Array.isArray(obj)) {
    return obj.reduce((acc, item) => {
      const filteredItem = deepFilter(item, predicate);
      if (filteredItem !== undefined) {
        acc.push(filteredItem);
      }
      return acc;
    }, []);
  } else if (typeof obj === 'object' && obj !== null) {
    const filteredObj = {};
    for (const key in obj) {
      if (obj.hasOwnProperty(key)) {
        const filteredValue = deepFilter(obj[key], predicate);
        if (filteredValue !== undefined) {
          filteredObj[key] = filteredValue;
        }
      }
    }
    return Object.keys(filteredObj).length > 0 ? filteredObj : undefined;
  } else {
    return predicate(obj) ? obj : undefined;
  }
}

// 示例用法
const data = {
  a: 1,
  b: {
    c: 2,
    d: [3, { e: 4, f: 5 }]
  },
  g: [6, 7]
};

const result = deepFilter(data, value => value === 4 || value === 6);
console.log(result);
// 输出: { e: 4 }, 6