使用具有嵌套对象的对象展平数组

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

const obj = {
  a: 1,
  b: {
    c: 2,
    d: {
      e: 3
    }
  }
};

const flattenedArray = flattenObject(obj);
console.log(flattenedArray); // [1, 2, 3]

function flattenObject(obj) {
  let result = [];
  let stack = [{obj, path: ''}];
  
  while (stack.length > 0) {
    let {obj, path} = stack.pop();
    for (let key in obj) {
      if (typeof obj[key] === 'object') {
        stack.push({obj: obj[key], path: path + key + '.'});
      } else {
        result.push(obj[key]);
      }
    }
  }
  
  return result;
}

const obj = {
  a: 1,
  b: {
    c: 2,
    d: {
      e: 3
    }
  }
};

const flattenedArray = flattenObject(obj);
console.log(flattenedArray); // [1, 2, 3]