Remove empty values from array of objects only if the value is empty in all objects

Question

I'm trying to remove the empty strings in my array.

This is my array:

let array = [
    { name: 'John', age: '18', address: '' }, 
    { name: 'George', age: '', address: '' }, 
    { name: 'Kevin', age: '25', address: '' }
]

I would like to remove the empty string values ONLY if it's empty in all objects.

desired outcome:

[
    { name:'John', age:'18' },
    { name:'George', age:'' },
    { name:'Kevin', age:'25' }
]

This is what I did but it removes EVERY empty string values:

 for (let i = 0; i < array.length; i++) {
    array[i] = Object.fromEntries(Object.entries(array[i]).filter(([_, v]) => v != ''));
 }

Can we assume that all objects in the array are the same (i.e. contain the same set of properties)? — yuvin
– yuvin, Commented Apr 13, 2022 at 8:10

Hao Wu · Accepted Answer · 2022-04-13 08:20:21Z

7

If you don't mind mutating the original array object. Here's a solution utilizing some array functions.

let array = [
  { name: 'John', age: '18', address: '' },
  { name: 'George', age: '', address: '' },
  { name: 'Kevin', age: '25', address: '' }
]

Object.keys(array[0])
  .filter(k => array.every(obj => !obj[k]))
  .forEach(k => array.forEach(obj => delete obj[k]));

console.log(array);

answered Apr 13, 2022 at 8:20

Hao Wu

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Comments

VLAZ · Accepted Answer · 2024-01-15 12:56:18Z

3

You can solve this issue with a filter method

get all the entries to be scanned in the array;
for each entry, filter the array with it; if the output array is empty then you can delete this value in the original array

let array = [{name:'John',age:'18',address:''},{name:'George',age:'',address:''},{name:'Kevin',age:'25',address:''}]

const entries = Object.keys(array[0])

entries.forEach(e => {
  if (array.filter(i => i[e]).length === 0) {
    array = array.map(i => {
      delete i[e];
      return i
    })
  }
})

console.log(array)

edited Jan 15, 2024 at 12:56

VLAZ

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answered Apr 13, 2022 at 8:23

Godev

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Comments

Alan Omar · Accepted Answer · 2022-04-13 08:48:16Z

1

If you don't want to mutate the original array:

let array = [{name:'John',age:'18',address:''},{name:'George',age:'',address:''},{name:'Kevin',age:'25',address:''}]


let result;

Object.keys(array[0])
.forEach(key => {
    if(array.every(e => e[key] === ''))
        result = array.map(({[key]:_,...rest}) => ({...rest}))
})

console.log(result)

answered Apr 13, 2022 at 8:48

Alan Omar

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