Last change
on this file since 84d0fbb was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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File size:
1.4 KB
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[6a3a178] | 1 | 'use strict';
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| 2 |
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| 3 | // do not edit .js files directly - edit src/index.jst
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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 (key === '_owner' && a.$$typeof) {
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| 39 | // React-specific: avoid traversing React elements' _owner.
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| 40 | // _owner contains circular references
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| 41 | // and is not needed when comparing the actual elements (and not their owners)
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| 42 | continue;
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| 43 | }
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| 44 |
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| 45 | if (!equal(a[key], b[key])) return false;
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| 46 | }
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| 47 |
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| 48 | return true;
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| 49 | }
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| 50 |
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| 51 | // true if both NaN, false otherwise
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| 52 | return a!==a && b!==b;
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| 53 | };
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