1 | 'use strict';
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2 |
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3 |
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4 |
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5 |
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6 |
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7 | module.exports = function equal(a, b) {
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8 | if (a === b) return true;
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9 |
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10 | if (a && b && typeof a == 'object' && typeof b == 'object') {
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11 | if (a.constructor !== b.constructor) return false;
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12 |
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13 | var length, i, keys;
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14 | if (Array.isArray(a)) {
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15 | length = a.length;
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16 | if (length != b.length) return false;
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17 | for (i = length; i-- !== 0;)
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18 | if (!equal(a[i], b[i])) return false;
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19 | return true;
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20 | }
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21 |
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22 |
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23 |
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24 | if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
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25 | if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
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26 | if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();
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27 |
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28 | keys = Object.keys(a);
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29 | length = keys.length;
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30 | if (length !== Object.keys(b).length) return false;
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31 |
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32 | for (i = length; i-- !== 0;)
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33 | if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
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34 |
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35 | for (i = length; i-- !== 0;) {
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36 | var key = keys[i];
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37 |
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38 | if (!equal(a[key], b[key])) return false;
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39 | }
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40 |
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41 | return true;
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42 | }
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43 |
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44 |
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45 | return a!==a && b!==b;
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46 | };
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