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I have an array of objects (comments added by users):

const myArray = [
  {
    "text": "Hello",
    "id": "11",
    "$type": "Comment"
  },
  {
    "text": "Date of birth: 01-01-2022",
    "id": "22",
    "$type": "Comment"
  },
  {
    "text": "lalala",
    "id": "33",
    "$type": "Comment"
  }
];

My goal is:

  1. find object, which string field text includes a phrase Date of birth
  2. find value of id field in this object

I tried this:

let dateOfBirthComment = myArray.find(element => element.text.includes('Date of birth'));

let dateOfBirthCommentId = dateOfBirthComment.id;

console.log(dateOfBirthCommentId);

When executing code above I get an error:

Error: Cannot read properties of null (reading 'includes')

Unfortunately, I can't use this:

let dateOfBirthComment = array.find(element => element.text === 'Date of birth: 01-01-2022');

Because date can be absolutely random in different cases.

Solution seems to be easy, but I'm quite new in JS and I'm really stuck. Could you please help me?

Alexander Aykhoff
  • 1
  • That means `text` is `null` in some of those objects. Either filter those beforehand or use [Optional chaining](//developer.mozilla.org/en/docs/Web/JavaScript/Reference/Operators/Optional_chaining). – Sebastian Simon Dec 09 '22 at 14:11
  • Your *provided* code works fine: https://jsfiddle.net/uhev8aqL/ - it fails if your have a missing/null text value *before* the one that matches. – freedomn-m Dec 09 '22 at 14:12
  • use `Optional chaining(?.)`. No error show, if some object doesn't have text – Anil kumar Dec 09 '22 at 14:14

0 Answers0