1 | var compareAscending = require('./_compareAscending');
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2 |
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3 | /**
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4 | * Used by `_.orderBy` to compare multiple properties of a value to another
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5 | * and stable sort them.
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6 | *
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7 | * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
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8 | * specify an order of "desc" for descending or "asc" for ascending sort order
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9 | * of corresponding values.
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10 | *
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11 | * @private
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12 | * @param {Object} object The object to compare.
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13 | * @param {Object} other The other object to compare.
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14 | * @param {boolean[]|string[]} orders The order to sort by for each property.
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15 | * @returns {number} Returns the sort order indicator for `object`.
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16 | */
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17 | function compareMultiple(object, other, orders) {
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18 | var index = -1,
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19 | objCriteria = object.criteria,
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20 | othCriteria = other.criteria,
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21 | length = objCriteria.length,
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22 | ordersLength = orders.length;
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23 |
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24 | while (++index < length) {
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25 | var result = compareAscending(objCriteria[index], othCriteria[index]);
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26 | if (result) {
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27 | if (index >= ordersLength) {
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28 | return result;
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29 | }
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30 | var order = orders[index];
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31 | return result * (order == 'desc' ? -1 : 1);
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32 | }
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33 | }
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34 | // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
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35 | // that causes it, under certain circumstances, to provide the same value for
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36 | // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
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37 | // for more details.
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38 | //
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39 | // This also ensures a stable sort in V8 and other engines.
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40 | // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
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41 | return object.index - other.index;
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42 | }
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43 |
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44 | module.exports = compareMultiple;
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