Remove empty objects, arrays, strings or integers from an object

Question

I have the following snippet that is not working and decided to isolate it into a nodejs script:

const _ = require('lodash');

let derpObject = {
    foo: "hey",
    bar: "",
    foo2: [],
    bar2: {}
}

function cleanObject(params) {
    const newObject = Object.keys(params).forEach( key => {
    console.log(params[key]);
        if(_.isNil(params[key]) || _.isEmpty(params[key])) {
      delete params[key]
    }
    });
  console.log('here', newObject);
  return newObject;
}

let result = cleanObject(derpObject);
console.log(result);

Basically my purpose is to check what properties are either empty or null from the main object and remove them and at the end return the new object with just the non empty/null properties.

However, running the above script outputs:

hey

[]
{}
here undefined
undefined
=> undefined

Any idea why I'm getting undefined? I've been banging my head with this one for a while now

You're mutating the original object, so just do return params — ziggy wiggy
– ziggy wiggy, Commented Oct 3, 2019 at 4:35
Why not taking advantage of Lodash functions: _.filter(derpObject, (e) => !_.isEmpty(e)). — Tushar
– Tushar, Commented Oct 3, 2019 at 4:47

shrys · Accepted Answer · 2019-10-03 11:56:34Z

.forEach() does not return anything hence undefined output, you might try assigning the values to new object and avoid changing the original object:

function cleanObject(params) {
  const newObject = {};
  Object.keys(params).forEach(key => {
    //console.log(params[key]);
    if (!(_.isNil(params[key]) || _.isEmpty(params[key]))) {
        newObject[key] = params[key]
    }
  });
  //console.log('here', newObject);
  return newObject;
}

let derpObject = {
  foo: "hey",
  bar: "",
  foo2: [],
  bar2: {}
}

function cleanObject(params) {
  const newObject = {};
  Object.keys(params).forEach(key => {
    //console.log(params[key]);
    if (!(_.isNil(params[key]) || _.isEmpty(params[key]))) {
        newObject[key] = params[key]
    }
  });
  //console.log('here', newObject);
  return newObject;
}

let result = cleanObject(derpObject);
console.log(result);

<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>

Pure lodash:

function cleanObject(params) {
  return _(params).omitBy(_.isNil).omitBy(_.isEmpty);
}

let derpObject = {
  foo: "hey",
  bar: "",
  foo2: [],
  bar2: {}
}

function cleanObject(params) {
  return _(params).omitBy(_.isNil).omitBy(_.isEmpty);
}

console.log(cleanObject(derpObject));

<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>

wakakak · Accepted Answer · 2019-10-03 04:36:37Z

0

I think you're almost there. I changed the logic a bit so that it will add the object key and value if the value is valid (not is nil or not is empty)

function cleanObject(params) {
    let newObject = {};
    Object.keys(params).forEach( key => {
        console.log(params[key]);
        if(!_.isNil(params[key]) || !_.isEmpty(params[key])) {
            newObject[key] = params[key]
        }
    });
  console.log('here', newObject);
  return newObject;
}

answered Oct 3, 2019 at 4:36

wakakak

8525 silver badges14 bronze badges

Comments

Yosvel Quintero · Accepted Answer · 2019-10-03 05:24:34Z

0

You can use Array.prototype.reduce() combined with Lodash#isNil() and Lodash#isEmpty()

Code:

const derpObject = {
  foo: "hey",
  bar: "",
  foo2: [],
  bar2: {}
}
const cleanObject = (o) => Object
  .keys(o)
  .reduce((a, k) => {
    if (!(_.isNil(o[k]) || _.isEmpty(o[k]))) {
      a[k] = o[k]
    }
    return a
  },{})
const result = cleanObject(derpObject)

console.log(result)

<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>

edited Oct 3, 2019 at 5:24

answered Oct 3, 2019 at 4:40

Yosvel Quintero

19.1k5 gold badges39 silver badges47 bronze badges

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