"Object doesn't support property or method 'find'" in IE

78

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>

        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>

    <script>

        $(document).ready(function () {


            var data = [{
                "Id": "SWE",
                "Country": "Sweden",
                "Population": 9592552
            }, {
                "Id": "NOR",
                "Country": "Norway",
                "Population": 5084190
            }];


            function display(e) {
                alert("E" + e);
                var countryData = data.find(function (element, index, array) {
                    return element.Id === e;
                });
                alert(countryData.Population);
            }
            display('SWE');


        });


    </script>
</head>
</html>

The code posted above is working properly on Firefox and Chrome but I get an error in Internet Explorer. Error message:

Object doesn't support property or method 'find'

This question is tagged with javascript c# visual-studio internet-explorer

~ Asked on 2016-06-13 11:23:59

The Best Answer is


50

Here is a work around. You can use filter instead of find; but filter returns an array of matching objects. find only returns the first match inside an array. So, why not use filter as following;

data.filter(function (x) {
         return x.Id === e
    })[0];

~ Answered on 2018-09-19 18:41:09


43

As mentioned array.find() is not supported in IE.

However you can read about a Polyfill here:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find#Polyfill

This method has been added to the ECMAScript 2015 specification and may not be available in all JavaScript implementations yet. However, you can polyfill Array.prototype.find with the following snippet:

Code:

// https://tc39.github.io/ecma262/#sec-array.prototype.find
if (!Array.prototype.find) {
  Object.defineProperty(Array.prototype, 'find', {
    value: function(predicate) {
     // 1. Let O be ? ToObject(this value).
      if (this == null) {
        throw new TypeError('"this" is null or not defined');
      }

      var o = Object(this);

      // 2. Let len be ? ToLength(? Get(O, "length")).
      var len = o.length >>> 0;

      // 3. If IsCallable(predicate) is false, throw a TypeError exception.
      if (typeof predicate !== 'function') {
        throw new TypeError('predicate must be a function');
      }

      // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
      var thisArg = arguments[1];

      // 5. Let k be 0.
      var k = 0;

      // 6. Repeat, while k < len
      while (k < len) {
        // a. Let Pk be ! ToString(k).
        // b. Let kValue be ? Get(O, Pk).
        // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
        // d. If testResult is true, return kValue.
        var kValue = o[k];
        if (predicate.call(thisArg, kValue, k, o)) {
          return kValue;
        }
        // e. Increase k by 1.
        k++;
      }

      // 7. Return undefined.
      return undefined;
    }
  });
}

~ Answered on 2017-11-02 08:17:55


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