https://dentalstudyhub.com/static/js/ie11_find_array.67b5a9edd5d5.js

1// Polyfill for patching IE11 Browsers
2// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find#Polyfill
3
4if (!Array.prototype.find) {
5    Object.defineProperty(Array.prototype, 'find', { // eslint-disable-line no-extend-native
6        value: function(predicate) {
7            'use strict';
8
9            var o, len, thisArg, k, kValue;
10
11            // 1. Let O be ? ToObject(this value).
12            if (this == null) {
13                throw new TypeError('"this" is null or not defined');
14            }
15
16            o = Object(this);
17
18            // 2. Let len be ? ToLength(? Get(O, "length")).
19            // eslint-disable-next-line no-bitwise
20            len = o.length >>> 0;
21
22            // 3. If IsCallable(predicate) is false, throw a TypeError exception.
23            if (typeof predicate !== 'function') {
24                throw new TypeError('predicate must be a function');
25            }
26
27            // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
28            thisArg = arguments[1];
29
30            // 5. Let k be 0.
31            k = 0;
32
33            // 6. Repeat, while k < len
34            while (k < len) {
35                // a. Let Pk be ! ToString(k).
36                // b. Let kValue be ? Get(O, Pk).
37                // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
38                // d. If testResult is true, return kValue.
39                kValue = o[k];
40                if (predicate.call(thisArg, kValue, k, o)) {
41                    return kValue;
42                }
43                // e. Increase k by 1.
44                k++;
45            }
46
47            // 7. Return undefined.
48            return undefined;
49        }
50    });
51}