Ramda：如何删除具有空值的对象中的键？

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 ie ''

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?

Answer 1

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>

Answer 2

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!

Answer 3

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]]});

Answer 4

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\";}"
}

Answer 5

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
}), {});

Answer 6

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);