How to check if specific Object element (not property) exists in an Array?

Question

I tried using .includes() method but I can't get it to work.

data = [{
    "Global Quote": {
        "01. symbol": "TSLA",
        "02. open": "256.7100",
        "03. high": "260.4800",
        "04. low": "254.5100",
        "05. price": "260.1700",
        "06. volume": "4967930",
        "07. latest trading day": "2019-07-23",
        "08. previous close": "255.6800",
        "09. change": "4.4900",
        "10. change percent": "1.7561%"
    }
}]

data.includes("Global Quote") ? console.log("found") : console.log("not 
found");

console logs "not found" every time...

It will show not found because you're comparing string against the object. — Rinkesh Golwala
– Rinkesh Golwala, Commented Jul 24, 2019 at 9:17

Eddie · Accepted Answer · 2019-07-24 09:27:03Z

2

If you want to check if the array contains atleast one object that has a certain property, you can use some

Example with property found:

var data = [{
  "Global Quote": {}
}]

data.some(o => "Global Quote" in o) ? console.log("found") : console.log("not found ");

Example with no property found:

var data = [{
    "Not Global Quote": {},
  },
  {
    "Not Global Quote Also": {},
  }
]

data.some(o => "Global Quote" in o) ? console.log("found") : console.log("not found ");

edited Jul 24, 2019 at 9:27

answered Jul 24, 2019 at 9:19

Eddie

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Comments

Andy · Accepted Answer · 2019-07-24 09:21:55Z

Assuming that you're going to have more than one object in that array you can use some.

const data = [{
  "Global Quote": {
    "01. symbol": "TSLA",
    "02. open": "256.7100",
    "03. high": "260.4800",
    "04. low": "254.5100",
    "05. price": "260.1700",
    "06. volume": "4967930",
    "07. latest trading day": "2019-07-23",
    "08. previous close": "255.6800",
    "09. change": "4.4900",
    "10. change percent": "1.7561%"
  }
}];

function findKey(arr, key) {
  return arr.some(obj => Object.keys(obj)[0] === key);
}

console.log(findKey(data, 'Global Test'));
console.log(findKey(data, 'Global Quote'));

Joachim Sauer · Accepted Answer · 2019-07-24 09:21:59Z

You aren't at the correct level in your object while checking for the property with data.includes(...).

You have to get one level deeper and check for the property with hasOwnProperty method.

Your code will look something like this:

const data = [{
    "Global Quote": {
        "01. symbol": "TSLA",
        "02. open": "256.7100",
        "03. high": "260.4800",
        "04. low": "254.5100",
        "05. price": "260.1700",
        "06. volume": "4967930",
        "07. latest trading day": "2019-07-23",
        "08. previous close": "255.6800",
        "09. change": "4.4900",
        "10. change percent": "1.7561%"
    }
}]


data[0].hasOwnProperty('Global Quote') ? console.log('found') : console.log('not found);

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