javascript如何使用过滤器功能过滤对象？

Question

I am trying to filter javascript object using filter function .But I am getting error key is not defined .here is my code https://jsfiddle.net/13n8n3om/

var arr=[
  {
    "EX": {

      "division": "abc",
      "is_active": true,

    }
  },
 {
    "PY": {

      "division": "pqwww",
      "is_active": false,

    }
  }
];

 arr = arr.filter(function(obj) {
                return obj[key] !== 'EX';
            });

            console.log(arr)

Expected output

[

 {
    "PY": {

      "division": "pqwww",
      "is_active": false,

    }
  }
]

Answer 1

replace

return obj[key] !== 'EX';

with

return Object.keys(obj)[0] !== 'EX';

basically you need to access the first property of obj and key is undefined.

Answer 2

Just check the key of the object if it is unequal with the given string.

 var arr = [{ "EX": { "division": "abc", "is_active": true, } }, { "PY": { "division": "pqwww", "is_active": false, } }]; arr = arr.filter(function (obj) { return Object.keys(obj)[0] !== 'EX'; }); document.write('<pre>' + JSON.stringify(arr, 0, 4) + '</pre>'); 

Answer 3

You need to check that the obj isn't EX like so :

arr = arr.filter(function(obj, key) {
          if (! obj.EX) {
              return obj;
          }
       });