Array.prototype.find visible and enumerable in every array instance

[bram2w]

Steps for Reproduction

Open this HTML code in IE 11:

<link href="http://cdn.quilljs.com/1.0.0-beta.6/quill.snow.css" rel="stylesheet">

<div id="editor">
  <p>Hello World!</p>
</div>

<script src="http://cdn.quilljs.com/1.0.0-beta.6/quill.min.js"></script>

<script>
    var data = {
        'tmp': [],
    };
    for(var block in data.tmp){
        console.log("test: " + data.tmp[block]);
    }
</script>

<script>
    var editor = new Quill('#editor', {
        theme: 'snow'
    });
</script>

Expected behavior: No console.log message

Actual behavior: console.log message "test: function(predicate){if(this===null){throw ..."

Platforms: IE 11 and PhantomJS

Version: 1.0.0-beta.6

Fix: In file /core/polyfill.js replace. I only tested this by replacing this in the released version.

if (!Array.prototype.find) {
  Array.prototype.find = function(predicate) {
    if (this === null) {
      throw new TypeError('Array.prototype.find called on null or undefined');
    }
    if (typeof predicate !== 'function') {
      throw new TypeError('predicate must be a function');
    }
    var list = Object(this);
    var length = list.length >>> 0;
    var thisArg = arguments[1];
    var value;

    for (var i = 0; i < length; i++) {
      value = list[i];
      if (predicate.call(thisArg, value, i, list)) {
        return value;
      }
    }
    return undefined;
  };
}

with:

if (!Array.prototype.find) {
  Object.defineProperty(Array.prototype, "find", {
    value: function(predicate) {
      if (this === null) {
        throw new TypeError('Array.prototype.find called on null or undefined');
      }
      if (typeof predicate !== 'function') {
        throw new TypeError('predicate must be a function');
      }
      var list = Object(this);
      var length = list.length >>> 0;
      var thisArg = arguments[1];
      var value;

      for (var i = 0; i < length; i++) {
        value = list[i];
        if (predicate.call(thisArg, value, i, list)) {
          return value;
        }
      }
      return undefined;
    };
  });
}

[jhchen]

Where are you getting your polyfill code from?

[bram2w]

I found this solution at http://stackoverflow.com/questions/35135127/adding-a-function-to-array-prototype-in-ie-results-in-it-being-pushed-in-to-ever.