How to delete empty objects from an Array in javascript?

Question

I am getting array like below.

[{},
 {},
 {},
{ label: '2015', showLabels: '1,' },
 {},
 {},
 {},
{ label: ‘2017’, showLabels: '1,' }]

but, I would like to delete empty indexes.

I have tried following to delete. But, Not working as expected.

const filteredFinalYearArr = yearArray.filter(function (el) {
  return el != null;
});

Note: This is dynamic data

Any suggestions?

How do I test for an empty JavaScript object? - In this thread you will get full brief about how to check empty object. — Adnan Sharif
– Adnan Sharif, Commented Mar 26, 2019 at 15:22

adiga · Accepted Answer · 2019-03-26 15:06:28Z

11

You could filter all the objects which have non-zero number of keys:

let yearArray = [{},{},{},{label:'2015',showLabels:'1,'},{},{},{},{label:'2017',showLabels:'1,'}]

let filtered = yearArray.filter(el => Object.keys(el).length)

console.log(filtered)

answered Mar 26, 2019 at 15:06

adiga

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Francis Leigh · Accepted Answer · 2019-03-26 15:30:45Z

1

See this article about best ways to check if an Object is empty.

const years = [
  {},
  {},
  {},
  { label: '2015', showLabels: '1,' },
  {},
  {},
  {},
  { label: '2017', showLabels: '1,' }
]

const hasValues = obj => {
  for(var key in obj) {
    if(obj.hasOwnProperty(key)) return true
  }
  return false
}

const filteredYears = years.filter(y => hasValues(y))

console.log(filteredYears)

edited Mar 26, 2019 at 15:30

answered Mar 26, 2019 at 15:10

Francis Leigh

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2 Comments

adiga Over a year ago

"Object.keys(obj).length is not supported on Firefox < 4 and IE < 9" Neither are arrow functions. OP is using react native. So, they will have traspilers or polyfills to support old browsers :)

Francis Leigh Over a year ago

@adiga oh yeah. thanks for pointing out. serves me right eh? :-D

Get Off My Lawn · Accepted Answer · 2019-03-26 15:18:16Z

0

Another way is to use reduce to build the array.

const yearArray = [{},{},{},{label:'2015',showLabels:'1,'},{},{},{},{label:'2017',showLabels:'1,'}]

const filteredFinalYearArr = yearArray.reduce((o, i) => {Object.keys(i).length > 0 && o.push(i); return o}, [])

console.log(filteredFinalYearArr)

answered Mar 26, 2019 at 15:18

Get Off My Lawn

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