How to remove falsy values from array of objects

Question

I have an array of objects like so,

const arr = [
 {                                       
  'first name': 'john',               
  'last name': 'doe',            
  age: '22',                            
  'matriculation number': '12349',      
  dob: '12/08/1997'                     
},                                      
{                                       
  'first name': 'Jane',               
  'last name': 'Doe',            
  age: '21',                            
  'matriculation number': '12345',      
  dob: '31/08/1999'                     
},                                      
{                                       
  'first name': '',                     
  'last name': undefined,               
  age: undefined,                       
  'matriculation number': undefined,    
  dob: undefined                        
}                                       
]

I want to remove the last object from the array since it has falsy values, I tried to achieve this by writing a simple function like so

function removeFalsy(obj) {
  for (let i in obj) {
    if (!obj[i]) {
      delete obj[i]
    }
  }
  return obj
}

That didn't fix the issue, I also tried to use

arr.map((a) => Object.keys(a).filter((b) => Boolean(b)))

but that just returned the keys in the object, how can I achieve this, please?

Thanks

Answer 1

Assuming that you want to remove all object with falsey values, you can use Array.prototype.filter on the input array, as well as Array.prototype.every to check entry values for being falsey

 const arr = [{ 'first name': 'john', 'last name': 'doe', age: '22', 'matriculation number': '12349', dob: '12/08/1997' }, { 'first name': 'Jane', 'last name': 'Doe', age: '21', 'matriculation number': '12345', dob: '31/08/1999' }, { 'first name': '', 'last name': undefined, age: undefined, 'matriculation number': undefined, dob: undefined } ]; const result = arr.filter((el) => Object.values(el).every(Boolean)); console.log(result)

Answer 2

try this

 const noFalsies = arr.filter( ( element) => {
        const props = Object.values(element)
        return ! props.some( (aProp) => !aProp)
      }
      )