Check if an object is equal to array

Question

I would like to check if an object has a child object array

for example

{
   "parent_category_id": "ABC",
   "parent_category_name": "ABC COMPANY",
   "place_id": 733,
   "industry": {
       "@nil": "true"
   }
   "street_id": 733
}

How would you check if the "Industry" object would have a child array. Like if "Industry" has a child array value of "@nil: true". Then alert Has Child

your `object.industry` is a plain js object not an array. It is not clear what you are looking for?! — A. Wolff, Dec 06 '17 at 08:30
@Martijn: That's for the OP to fix. The misunderstanding of what's what may be the crux of the problem. — Cerbrus, Dec 06 '17 at 08:32
Please clarify your quesion, what array are you expecting? And `@nil: true` is not an array value, it's an attribute of an object of type boolean or string in your code snippet. — M0nst3R, Dec 06 '17 at 08:38
@GhassenLouhaichi: same comment as I made to Martijn: Don't change the wording of the question. The misunderstanding there may well be the reason for the question. — Cerbrus, Dec 06 '17 at 08:58

score 1 · Accepted Answer · edited Dec 06 '17 at 08:54

1

You can check with the instanceof operator.

For example:

var t = {
    "parent_category_id": "ABC",
    "parent_category_name": "ABC COMPANY",
    "place_id": 733,
    "industry": {
        "@nil": "true"
    },
    "street_id": 733
};

After it, you can use:

t.industry instanceof Object // result is: true
t.industry instanceof Array  // result is: false

edited Dec 06 '17 at 08:54

M0nst3R

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answered Dec 06 '17 at 08:43

FarukT

1,560
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score 0 · Answer 2 · answered Dec 06 '17 at 08:34

If you simply want to check if an object has children and is not empty you can either do an IF statement like:

if (obj.industry) {}

or like this using the Object.getOwnPropertyNames(obj) method which will return the names of all properties within an object:

var obj = {
   "parent_category_id": "ABC",
   "parent_category_name": "ABC COMPANY",
   "place_id": 733,
   "industry": {
       "@nil": "true"
   },
   "street_id": 733
};
var names = Object.getOwnPropertyNames(obj.industry);

names.forEach(name => console.log('Property/Value ->', name, obj.industry[name]));

score 0 · Answer 3 · edited Dec 06 '17 at 09:04

You can do:

info = {
  "string": "ABC",
  "array": [1, 2, 3],
  "object": {
    "key": "value"
  },
  "object(empty)": {},
}

function isEmpty(obj) {
  if (obj instanceof Object && !(obj instanceof Array)) {
    for (var i in obj) {
      if (hasOwnProperty.call(obj, i)) return false;
    }
  }
  return true;
}

for (var i in info) {
  if (isEmpty(info[i]) == false) {
    console.log(info[i]);
  }
}

Reference: Is object empty?

score -1 · Answer 4 · answered Dec 06 '17 at 08:33

-1

Array.isArray(parentobj.industry)

if you meant to check if it is an array or not

answered Dec 06 '17 at 08:33

Loredra L

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Check if an object is equal to array

4 Answers4