How to check if array of object's properties are empty or not in javascript

Question

I want to check the following array have any empty value or not

Example

The following should return true

[
    {
        "price": "12",
        "number": "1"
    },
    {
        "price": "12",
        "number": "1"
    }
]

The following should return false

[
    {
        "price": "12",
        "number": "1"
    },
    {
        "price": "12",
        "number": ""
    }
]

No. Because it has both keys and values, but the other doesn't have one value. — Benk I
– Benk I, Commented Sep 3, 2021 at 16:19
Shouldn't the first example be false, and the second example be true, if the question is "Does it have an empty value or not"? — Andy
– Andy, Commented Sep 3, 2021 at 16:50

Spectric · Accepted Answer · 2021-09-03 20:55:53Z

1

You can use Array.some and Object.values to check whether one of the property value's length of an item in the array is smaller than 1:

const arr=[{price:"12",number:"1"},{price:"12",number:"1"}];

const isValid = !arr.some(e => Object.values(e).some(f => f.length < 1))

console.log(isValid)

edited Sep 3, 2021 at 20:55

answered Sep 3, 2021 at 16:18

Spectric

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5 Comments

pyb Over a year ago

Why f.length < 1 instead of f.length == 0 ?

secan Over a year ago

Just a side note: a problem might arise if the number attribute can contain an actual number, or be null or undefined rather than an empty string; in that case f.length would throw an error. If values other than strings should be taken into account, it might be worth replacing f => f.length < 1 with f => ['', null, undefined].includes(f)

Peter Seliger Over a year ago

@BenkI + at secan ... For exactly such edge cases it was always better if the OP would specify the exact requirements. Otherwise the OP gets A's which exactly match/cover what was ask for. Also, how are empty items ... { } ... (no properties no values) supposed to be handled?

secan Over a year ago

@PeterSeliger just to be clear, I was not implying the answer given by Spectric is wrong or incomplete; I just thought it could be worth mentioning the issue in case the OP did not take that eventuality into consideration.

Peter Seliger Over a year ago

@secan ... Me neither, that's the reason for having primarily addressed the OP in my above comment.

Peter Seliger · Accepted Answer · 2021-09-04 09:23:28Z

1

function isNonEmptyValue(value) {
  return (
    (value != null)
    && (value !== '') 
  //&& any other *empty* value constraint
  );
}
function hasEntriesAndNoEmptyValues(item) {
  const values = Object.values(item);
  return (
    values.length >= 1 &&
    values.every(value => isNonEmptyValue(value))
  );
}

console.log(
  [{
    "price": "12",
    "number": "1",
  }, {
    "price": "12",
    "number": "",

  }].every(hasEntriesAndNoEmptyValues)
);
console.log(
  [{
    "price": "12",
    "number": "1",
  }, {
    "price": "12",
    "number": " ",

  }].every(hasEntriesAndNoEmptyValues)
);
console.log(
  [{

  }, {
    "price": "12",
    "number": " ",

  }].every(hasEntriesAndNoEmptyValues)
);

edited Sep 4, 2021 at 9:23

answered Sep 3, 2021 at 16:31

Peter Seliger

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