CODEWITHSUNDEEP
javascript
user1896653
user1896653

Reputation: 3327

How to create an array from object which has specific properties in child objects

Let's say there is an object:

var obj = {
    filed1: {
    id: 'first',
    order: 3,
    rules: {
        required: true,
        minlength: 5
    }
  },
  filed2: {
    id: 'second',
    order: 2,
    rules: {
        required: true
    }
  },
  filed3: {
    id: 'third',
    order: 1,
  }
}

I want to create an array which will contain the id of object who has required property. So, in this case the array will be:

['first', 'second']

How to do this?

var obj = {
    filed1: {
    id: 'first',
    order: 3,
    rules: {
        required: true,
        minlength: 5
    }
  },
  filed2: {
    id: 'second',
    order: 2,
    rules: {
        required: true
    }
  },
  filed3: {
    id: 'third',
    order: 1,
  }
}

var arr = [];

/*for (key in obj) {
  if obj.hasOwnProperty(required) {
    var ids = 
    arr.push(ids);
  }
}*/
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

Upvotes: 0

Views: 43

Answers (2)

Shankar Acharya
Shankar Acharya

Reputation: 86

I strongly recommend suggestion provided by Sebastian Simon. But If you are looking for something copy paste, please use following function. Pass your object as function parameter.

function getRequiredIds(obj) {
  var ids = [];
  for (var key in obj) {
    if (obj[key]["rules"] && obj[key]["rules"]["required"])
      ids.push(obj[key]["id"]);
  }
  return ids;
}

Upvotes: 0

31piy
31piy

Reputation: 23859

Get all the values of obj using Object.values. Then you can just use filter and map to get the desired result.

You can also use reduce to do this in a single loop.

var obj = {
  filed1: {
    id: 'first',
    order: 3,
    rules: {
      required: true,
      minlength: 5
    }
  },
  filed2: {
    id: 'second',
    order: 2,
    rules: {
      required: true
    }
  },
  filed3: {
    id: 'third',
    order: 1,
  }
};

const result = Object.values(obj)
  .filter(val => (val.rules || {}).required)
  .map(val => val.id);

console.log(result);

Upvotes: 3

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