如何使用嵌套对象中的值获取所有键

Question

我正在寻找类似的东西,Object.keys但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).

例A

输入

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

预期产出

[
  "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:

例B

输入

{
   "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,
      }
   }
}

预期产出

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

请注意,这并不包括tags,check_params,check_params.params,或者check_params.encryption因为这些值是数组/对象.

这个问题

有没有这样做的图书馆？你将如何实现它,以便它可以使用任何对象,大型和嵌套,或小？

Answer 1

您可以像这样使用reduce:

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 + '.')];
    } else {
      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);

Answer 2

生成器可以快速解决此类问题 -

function* deepKeys (t, pre = [])
{ if (Array.isArray(t))
    return
  else if (Object(t) === t)
    for (const [k, v] of Object.entries(t))
      yield* deepKeys(v, [...pre, k])
  else
    yield pre.join(".")
}

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,}}}
 
console.log(Array.from(deepKeys(input)))

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

或者是一个急切计算所有键的纯函数表达式 -

const deepKeys = (t, pre = []) =>
  Array.isArray(t)
    ? []
: Object(t) === t
   ? Object
      .entries(t)
      .flatMap(([k, v]) => deepKeys(v, [...pre, k]))
: pre.join(".")

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,}}}
 
console.log(deepKeys(input))

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