delete multiple object key value in javascript

Question

I would like to know how to remove multiple keys in object javascript. how to remove the date keys in the obj.

var obj ={
  "id": "1",
  "cn": "TH",
  "curr": "THB",
  "10-02-2020": "10,11",
  "12-01-2019": "2,5"
}

var result = filterkeys(obj,["id","cn","curr"]);

function filterkeys(obj,arr){
   arr.forEach(function(key) {
    delete !obj[key];
  });
  return obj;
}

Expected Output:

{
  "id": "1",
  "cn": "TH",
  "curr": "THB"
}

you can either try lodash omit or pick lodash.com/docs/4.17.15#omit — Theophilus Omoregbee
– Theophilus Omoregbee, Commented Mar 2, 2020 at 4:12
Does this answer your question? Javascript delete an object key array value — deepak thomas
– deepak thomas, Commented Mar 2, 2020 at 4:22

CertainPerformance · Accepted Answer · 2020-03-02 04:07:04Z

You need to go the other way around - iterate over all keys of the object, and if it isn't in the arr, delete it:

var obj ={
  "id": "1",
  "cn": "TH",
  "curr": "THB",
  "10-02-2020": "10,11",
  "12-01-2019": "2,5"
}

var result = filterkeys(obj,["id","cn","curr"]);

function filterkeys(obj,arr){
  for (const key of Object.keys(obj)) {
    if (!arr.includes(key)) {
      delete obj[key];
    }
  }
  return obj;
}

console.log(result);

Or, without delete (probably better to avoid delete when possible - it's good to avoid mutation) - map the keys array to construct a new object with Object.fromEntries:

var obj ={
  "id": "1",
  "cn": "TH",
  "curr": "THB",
  "10-02-2020": "10,11",
  "12-01-2019": "2,5"
};
const filterkeys = (obj,arr) => Object.fromEntries(
  arr.map(key => [key, obj[key]])
);

var result = filterkeys(obj,["id","cn","curr"]);

console.log(result);

Siva Kondapi Venkata · Accepted Answer · 2020-03-02 04:20:19Z

Use Object.assign and add the entries by required keys map.
Alternatively you can use Reflect.deleteProperty to remove unwanted keys.

var obj = {
  id: "1",
  cn: "TH",
  curr: "THB",
  "10-02-2020": "10,11",
  "12-01-2019": "2,5"
};

const filterkeys = (obj, keys) =>
  Object.assign({}, ...keys.map(key => ({ [key]: obj[key] })));

var result = filterkeys(obj, ["id", "cn", "curr"]);

console.log(result);

const filterkeys2 = (obj, keys) => {
  Object.keys(obj).forEach(key => !keys.includes(key) && Reflect.deleteProperty(obj, key))
  return obj;
};
var result2 = filterkeys2(obj,["id","cn","curr"]);
console.log(result2);

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