Filter empty arrays from object of arrays in JS

Question

I have an array of objects

{
   "name":"DLF Shop",
   "merchant_code":"EM499751e",
   "address":"Link Rd, Dhaka 1205, Bangladesh",
   "longitude":90.3937913,
   "latitude":23.7456808,
   "mother_shop_slug":"test-qa-26f7d03d",
   "shop_type":"regular",
   "key_personnel":[
      {
         "name":"",
         "designation":"",
         "phone_no":"",
         "email":""
      }
   ],
   "category_head":[
      {
         "username":""
      }
   ],
   "bdm":[
      {
         "username":""
      }
   ],
   "kam":[
      {
         "username":""
      }
   ],
   "vm":[
      {
         "username":""
      }
   ],
   "organisation_type":"small",
   "is_mother_shop":false,
   "is_delivery_hero_allowed":false,
   "is_cod_allowed":false
}

I want to filter out all the empty arrays in this object. So, after filtering in the newly created object there will be no empty arrays or any empty key in this object.

"vm": [ {"username": ""}], - is this the kind of thing you want to filter out? Even though the array is not empty and the object is not empty, there's no value - filter that out? — Kinglish
– Kinglish, Commented May 10, 2021 at 16:20
@JohnTyner yes I want to filter out the arrays with null values like "vm": [ {"username": ""}], — ashfaqrafi
– ashfaqrafi, Commented May 10, 2021 at 16:23
@NinaScholz empty key is not present in the object though, empty key would be something like if the name field is empty like {"name": ""} — ashfaqrafi
– ashfaqrafi, Commented May 10, 2021 at 16:25

Nina Scholz · Accepted Answer · 2021-05-10 16:45:39Z

You could take

filtering for arrays
filtering for objects

and get only the properties with values unequal to ''.

const
    filter = data => {
        if (Array.isArray(data)) {
            const temp = data.reduce((r, v) => {
                v = filter(v);
                if (v !== '') r.push(v);
                return r;
            }, []);
            return temp.length
                ? temp
                : '';
        }
        if (data && typeof data === 'object') {
            const temp = Object.entries(data).reduce((r, [k, v]) => {
                v = filter(v);
                if (v !== '') r.push([k, v]);
                return r;
            }, []);
            return temp.length
                ? Object.fromEntries(temp)
                : '';
        }
        return data;
    },
    data = { name: "DLF Shop", merchant_code: "EM499751e", address: "Link Rd, Dhaka 1205, Bangladesh", longitude: 90.3937913, latitude: 23.7456808, mother_shop_slug: "test-qa-26f7d03d", shop_type: "regular", key_personnel: [{ name: "", designation: "", phone_no: "", email: "" }], category_head: [{ username: "" }], bdm: [{ username: "" }], kam: [{ username: "" }], vm: [{ username: "" }], organisation_type: "small", is_mother_shop: false, is_delivery_hero_allowed: false, is_cod_allowed: false },
    result = filter(data);

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Kinglish · Accepted Answer · 2021-05-10 16:46:07Z

var str = '{"name":"DLF Shop","merchant_code":"EM499751e","address":"Link Rd, Dhaka 1205, Bangladesh","longitude":90.3937913,"latitude":23.7456808,"mother_shop_slug":"test-qa-26f7d03d","shop_type":"regular","key_personnel":[{"name":"","designation":"","phone_no":"","email":""}],"category_head":[{"username":""}],"bdm":[{"username":""}],"kam":[{"username":"testforthis"}],"vm":[{"username":""}],"organisation_type":"small","is_mother_shop":false,"is_delivery_hero_allowed":false,"is_cod_allowed":false}';
    let json = JSON.parse(str);


    cleanObject = function(object) {
    Object
        .entries(object)
        .forEach(([k, v]) => {
            if (v && typeof v === 'object')
                cleanObject(v);
            if (v && 
                typeof v === 'object' && 
                !Object.keys(v).length || 
                v === null || 
                v === undefined ||
                v.length === 0
            ) {
                if (Array.isArray(object))
                    object.splice(k, 1);
                else if (!(v instanceof Date))
                    delete object[k];
            }
        });
    return object;
}

let newobj = cleanObject(json);
console.log(newobj);

From https://stackoverflow.com/a/52399512/1772933

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