如何将嵌套对象转换为数组？

function flattenObject(obj, prefix = '') {
  let result = [];
  for (let key in obj) {
    if (typeof obj[key] === 'object' && obj[key] !== null) {
      result = result.concat(flattenObject(obj[key], prefix + key + '.'));
    } else {
      result.push([prefix + key, obj[key]]);
    }
  }
  return result;
}

// 示例嵌套对象
const nestedObject = {
  a: 1,
  b: {
    c: 2,
    d: {
      e: 3
    }
  },
  f: 4
};

// 转换为数组
const flattenedArray = flattenObject(nestedObject);
console.log(flattenedArray);

[
  ['a', 1],
  ['b.c', 2],
  ['b.d.e', 3],
  ['f', 4]
]