45 lines
1.6 KiB
JavaScript
45 lines
1.6 KiB
JavaScript
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var baseCompareAscending = require('./baseCompareAscending');
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/**
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* Used by `_.sortByOrder` to compare multiple properties of a value to another
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* and stable sort them.
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*
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* If `orders` is unspecified, all valuess are sorted in ascending order. Otherwise,
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* a value is sorted in ascending order if its corresponding order is "asc", and
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* descending if "desc".
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*
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* @private
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* @param {Object} object The object to compare.
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* @param {Object} other The other object to compare.
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* @param {boolean[]} orders The order to sort by for each property.
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* @returns {number} Returns the sort order indicator for `object`.
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*/
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function compareMultiple(object, other, orders) {
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var index = -1,
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objCriteria = object.criteria,
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othCriteria = other.criteria,
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length = objCriteria.length,
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ordersLength = orders.length;
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while (++index < length) {
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var result = baseCompareAscending(objCriteria[index], othCriteria[index]);
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if (result) {
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if (index >= ordersLength) {
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return result;
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}
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var order = orders[index];
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return result * ((order === 'asc' || order === true) ? 1 : -1);
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}
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}
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// Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
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// that causes it, under certain circumstances, to provide the same value for
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// `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
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// for more details.
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//
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// This also ensures a stable sort in V8 and other engines.
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// See https://code.google.com/p/v8/issues/detail?id=90 for more details.
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return object.index - other.index;
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}
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module.exports = compareMultiple;
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