_compareMultiple.js (1599B)
1 var compareAscending = require('./_compareAscending'); 2 3 /** 4 * Used by `_.orderBy` to compare multiple properties of a value to another 5 * and stable sort them. 6 * 7 * If `orders` is unspecified, all values are sorted in ascending order. Otherwise, 8 * specify an order of "desc" for descending or "asc" for ascending sort order 9 * of corresponding values. 10 * 11 * @private 12 * @param {Object} object The object to compare. 13 * @param {Object} other The other object to compare. 14 * @param {boolean[]|string[]} orders The order to sort by for each property. 15 * @returns {number} Returns the sort order indicator for `object`. 16 */ 17 function compareMultiple(object, other, orders) { 18 var index = -1, 19 objCriteria = object.criteria, 20 othCriteria = other.criteria, 21 length = objCriteria.length, 22 ordersLength = orders.length; 23 24 while (++index < length) { 25 var result = compareAscending(objCriteria[index], othCriteria[index]); 26 if (result) { 27 if (index >= ordersLength) { 28 return result; 29 } 30 var order = orders[index]; 31 return result * (order == 'desc' ? -1 : 1); 32 } 33 } 34 // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications 35 // that causes it, under certain circumstances, to provide the same value for 36 // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247 37 // for more details. 38 // 39 // This also ensures a stable sort in V8 and other engines. 40 // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details. 41 return object.index - other.index; 42 } 43 44 module.exports = compareMultiple;