How can I remove empty object in from an array in

问题:

I have an array of objects and when I stringify, it looks like this:

"[[{"entrReqInv": "Neither"},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}]]"

How can I remove the empty {}s?

回答1:

var newArray = array.filter(value => Object.keys(value).length !== 0);

回答2:

You can use Array.prototype.filter to remove the empty objects before stringifying.

JSON.stringify(array.filter(function(el) {
    // keep element if it's not an object, or if it's a non-empty object
    return typeof el != "object" || Array.isArray(el) || Object.keys(el).length > 0;
});

回答3:

I would recommend using the following code:

var newArray = array.filter(value => JSON.stringify(value) !== '{}');

I did not use Object.keys(value).length !== 0 because it not only removes empty objects { } but also removes empty arrays [ ]. If you only want to remove empty objects, use the above method.

回答4:

Simpler to understand:

let primaryArray = [{key:'value'},{},{},{}]
let removeObsoletesArray = []
primaryArray.forEach( element => {
   if(element.length > 0){
      removeObsoletesArray.push(element)
   }
})

回答5:

Here's what I would do, for progressive enhancement reasons:

var aryAry = [[{prop: 'value'},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}]];
var a = aryAry[0], r = [];
for(var i=0,l=a.length; i<l; i++){
  var n = 0, o = a[i];
  for(var q in o){
    n++;
  }
  if(n > 0){
    r.push(o);
  }
}
console.log(r);

回答6:

let arr = [{a:1},{},{c:3}];

arr = _.filter(arr,v => _.keys(v).length !== 0);

console.log(arr)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

arr= _.filter(arr,v => _.keys(v).length !== 0);