Ramda: How to remove keys in objects with empty values?

Question

I have this object:

let obj = {
  matrimonyUrl: 'christian-grooms',
  search_criteria:
    'a:2:{s:6:"gender";s:4:"Male";s:9:"community";s:9:"Christian";}',
  mothertongue: null,
  religion: 'Christian',
  caste: '',
  country: null
};

I need to remove all key/value pairs in this object where the value is blank i.e. ''

So the caste: '' property should be removed in the above case.

I have tried:

R.omit(R.mapObjIndexed((val, key, obj) => val === ''))(obj);

But this doesn't do anything. reject doesn't work either. What am I doing wrong?

Are you also interested in a solution which removes empty keys in nested objects? — Mulan, Jun 17 '19 at 15:14

score 11 · Accepted Answer · answered Jun 16 '19 at 11:08

11

You can use R.reject (or R.filter) to remove properties from an object using a callback:

const obj = {
  matrimonyUrl: 'christian-grooms',
  search_criteria:
    'a:2:{s:6:"gender";s:4:"Male";s:9:"community";s:9:"Christian";}',
  mothertongue: null,
  religion: 'Christian',
  caste: '',
  country: null
};

const result = R.reject(R.equals(''))(obj);

console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.js"></script>

answered Jun 16 '19 at 11:08

Ori Drori

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How do I use `filter`? – Amit Erandole Jun 16 '19 at 11:13
1

With R.complement - `R.filter(R.complement(R.equals)(''))` Filter everything which is not equal to '' – Ori Drori Jun 16 '19 at 11:15

score 6 · Answer 2 · answered Nov 02 '20 at 16:16

I did it like that, but I was also needed to exclude the nullable values, not only the empty one.

const obj = { a: null, b: '',  c: 'hello world' };

const newObj = R.reject(R.anyPass([R.isEmpty, R.isNil]))(obj);

< --- only C going to display after

newObj = { c: 'hello world' }

Basically Reject is like filter but not include the results. doing filter(not(....), items) If any of my conditions pass it will reject the specific key.

Hope It's helps!

lvd · Answer 3 · 2019-06-16T17:56:00.067

2

Are you ok to use pure javascript for this ? (no Ramda)

If you really need to remove a property from an object, you can use delete operator.

for (const key in obj) {
    if (obj[key] === "") {
        delete obj[key];
    }
}

If you prefer one-liner :

Object.entries(obj).forEach(e => {if (e[1] === "") delete obj[e[0]]});

edited Jun 16 '19 at 17:56

answered Jun 16 '19 at 11:16

lvd

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7
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score 1 · Answer 4 · answered Jan 06 '23 at 15:21

if you want a pure javascript answer:

const obj = {
  matrimonyUrl: 'christian-grooms',
  search_criteria:
    'a:2:{s:6:"gender";s:4:"Male";s:9:"community";s:9:"Christian";}',
  mothertongue: null,
  religion: 'Christian',
  caste: '',
  country: null,
};

// Iterate over obj keys
const newObj = Object.keys(obj).reduce((acc, key) => ({
  // Return the accumulator obj on every iteration
  ...acc,
  // Decide if we want to return the current {key:value} pair 
  ...(obj[key] !== '' ? { [key]: obj[key] } : {}),
// Initialize the accumulator obj
}), {});

score 0 · Answer 5 · answered Oct 19 '21 at 10:22

reject(complement(identity))
({
  matrimonyUrl: 'christian-grooms',
  search_criteria:
    'a:2:{s:6:"gender";s:4:"Male";s:9:"community";s:9:"Christian";}',
  mothertongue: null,
  religion: 'Christian',
  caste: '',
  country: null
})


{"matrimonyUrl": "christian-grooms",
"religion": "Christian", 
"search_criteria": "a:2:{s:6:\"gender\";s:4:\"Male\";s:9:\"community\";s:9:\"Christian\";}"
}

score -2 · Answer 6 · edited Jun 16 '19 at 11:59

-2

const obj = {
  matrimonyUrl: 'christian-grooms',
  search_criteria:
    'a:2:{s:6:"gender";s:4:"Male";s:9:"community";s:9:"Christian";}',
  mothertongue: null,
  religion: 'Christian',
  caste: '',
  country: null
};

const result = R.reject(R.equals(''))(obj);

console.log(result);

edited Jun 16 '19 at 11:59

mastisa

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answered Jun 16 '19 at 11:14

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Ramda: How to remove keys in objects with empty values?

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