Remove empty Objects from Array

问题:

I have a JavaScript-array with objects filled in and want to remove every object with no data. It might look like this:

var myArray = [ {id: "28b", text:"Phill"},
                {id: "12c", text:"Peter"},
                {id: "43f", text:"Ashley"},
                {id: "43f", text:"Ashley"},
                {id: "", text:""},
                {id: "9a", text:"James"},
                {id: "", text:""},
                {id: "28b", text:"Phill"}
              ];

I already use _.uniq from underscore.js to remove all duplicates from my array, which works fine. Though they are unique, one empty Object is always left when I dynamically fill in data (because there are empty datasets). I already tried the _.without function as mentioned here: Remove empty elements from an array in Javascript but it doesn't work. Here is my attempt:

myArray = _.without(myArray, {id:"",text:""});

The array should look like this:

              [ {id: "28b", text:"Phill"},
                {id: "12c", text:"Peter"},
                {id: "43f", text:"Ashley"},
                {id: "9a", text:"James"},
              ];

I am also using jQuery if there is a solution with this library.

回答1:

// Code goes here

myArray = [{
    id: "28b",
    text: "Phill"
  }, {
    id: "12c",
    text: "Peter"
  }, {
    id: "43f",
    text: "Ashley"
  }, {
    id: "43f",
    text: "Ashley"
  }, {
    id: "",
    text: ""
  }, {
    id: "9a",
    text: "James"
  }, {
    id: "",
    text: ""
  }, {
    id: "28b",
    text: "Phill"
  }

]

var result = _.filter(_.uniq(myArray, function(item, key, a) {
  return item.id;
}), function(element) {
  return element.id && element.text
});
console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>

回答2:

You can try this:

_.filter(myArray, _.isEmpty)

I assume empty means

var obj = {}

回答3:

No need for a library, just take Array#filter and an object. With dynamic filtering, for all properties.

var myArray = [{ id: "28b", text: "Phill" }, { id: "12c", text: "Peter" }, { id: "43f", text: "Ashley" }, { id: "43f", text: "Ashley" }, { id: "", text: "" }, { id: "9a", text: "James" }, { id: "", text: "" }, { id: "28b", text: "Phill" }],
    filtered = myArray.filter(function (a) {
        var temp = Object.keys(a).map(function (k) { return a[k]; }),
            k = temp.join('|');

        if (!this[k] && temp.join('')) {
            this[k] = true;
            return true;
        }
    }, Object.create(null));

console.log(filtered);

回答4:

try (ECMA5+):

var myArrayFiltered = myArray.filter((ele) => {
  return ele.constructor === Object && Object.keys(ele).length > 0
});