如何从嵌套对象中获取具有值的所有键 [英] How to get all keys with values from nested objects

问题描述

我正在寻找类似于 Object.keys 的东西，但它适用于潜在的嵌套对象.它也不应该包含具有对象/数组值的键(它应该只包含具有直接字符串/数字/布尔值的键).

I'm looking for something kind of like Object.keys but that works for potentially nested objects. It also shouldn't include keys that have object/array values (it should only include keys with immediate string/number/boolean values).

{
   "check_id":12345,
   "check_name":"Name of HTTP check",
   "check_type":"HTTP"
}

预期输出

[
  "check_id",
  "check_name",
  "check_type"
]

Object.keys 适用于像这样的扁平案例，但不适用于嵌套案例:

Object.keys would work for flat cases like this, but not for nested cases:

{
   "check_id":12345,
   "check_name":"Name of HTTP check",
   "check_type":"HTTP",
   "tags":[
     "example_tag"
   ],
   "check_params":{
      "basic_auth":false,
      "params":[
        "size"
      ],
      "encryption": {
        "enabled": true,
      }
   }
}

预期输出

[
  "check_id",
  "check_name",
  "check_type",
  "check_params.basic_auth",
  "check_params.encryption.enabled"
]

请注意，这不包括 tags、check_params、check_params.params 或 check_params.encryption，因为这些值是数组/对象.

Note that this does not include tags, check_params, check_params.params, or check_params.encryption since these values are arrays/objects.

有这样的图书馆吗?您将如何实现它以便它可以与任何对象(大的、嵌套的或小的)一起使用?

Is there a library that does this? How would you implement it so that it can work with any object, large and nested, or small?

推荐答案

你可以这样使用 reduce:

You could use reduce like this:

const keyify = (obj, prefix = '') => 
  Object.keys(obj).reduce((res, el) => {
    if( Array.isArray(obj[el]) ) {
      return res;
    } else if( typeof obj[el] === 'object' && obj[el] !== null ) {
      return [...res, ...keyify(obj[el], prefix + el + '.')];
    }
    return [...res, prefix + el];
  }, []);

const input = {
   "check_id":12345,
   "check_name":"Name of HTTP check",
   "check_type":"HTTP",
   "tags":[
     "example_tag"
   ],
   "check_params":{
      "basic_auth":false,
      "params":[
        "size"
      ],
      "encryption": {
        "enabled": true,
        "testNull": null,
      }
   }
};

const output = keyify(input);

console.log(output);

Edit1:对于您想要包含数组的一般情况.

For the general case where you want to include arrays.

const keyify = (obj, prefix = '') => 
  Object.keys(obj).reduce((res, el) => {
    if( typeof obj[el] === 'object' && obj[el] !== null ) {
      return [...res, ...keyify(obj[el], prefix + el + '.')];
    }
    return [...res, prefix + el];
  }, []);

const input = {
   "check_id":12345,
   "check_name":"Name of HTTP check",
   "check_type":"HTTP",
   "tags":[
     "example_tag"
   ],
   "nested": [
      { "foo": 0 },
      { "bar": 1 }
   ],
   "check_params":{
      "basic_auth":false,
      "params":[
        "size"
      ],
      "encryption": {
        "enabled": true,
        "testNull": null,
      }
   }
};

const output = keyify(input);

console.log(output);

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