54 lines
1.4 KiB
JavaScript
54 lines
1.4 KiB
JavaScript
'use strict';
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// do not edit .js files directly - edit src/index.jst
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module.exports = function equal(a, b) {
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if (a === b) return true;
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if (a && b && typeof a == 'object' && typeof b == 'object') {
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if (a.constructor !== b.constructor) return false;
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var length, i, keys;
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if (Array.isArray(a)) {
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length = a.length;
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if (length != b.length) return false;
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for (i = length; i-- !== 0;)
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if (!equal(a[i], b[i])) return false;
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return true;
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}
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if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
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if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
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if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();
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keys = Object.keys(a);
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length = keys.length;
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if (length !== Object.keys(b).length) return false;
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for (i = length; i-- !== 0;)
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if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
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for (i = length; i-- !== 0;) {
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var key = keys[i];
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if (key === '_owner' && a.$$typeof) {
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// React-specific: avoid traversing React elements' _owner.
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// _owner contains circular references
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// and is not needed when comparing the actual elements (and not their owners)
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continue;
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}
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if (!equal(a[key], b[key])) return false;
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}
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return true;
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}
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// true if both NaN, false otherwise
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return a!==a && b!==b;
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};
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