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