91 lines
2.8 KiB
JavaScript
91 lines
2.8 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = sortBy;
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var _arrayMap = require('lodash/_arrayMap');
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var _arrayMap2 = _interopRequireDefault(_arrayMap);
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var _baseProperty = require('lodash/_baseProperty');
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var _baseProperty2 = _interopRequireDefault(_baseProperty);
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var _map = require('./map');
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var _map2 = _interopRequireDefault(_map);
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var _wrapAsync = require('./internal/wrapAsync');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Sorts a list by the results of running each `coll` value through an async
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* `iteratee`.
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*
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* @name sortBy
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* @static
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* @memberOf module:Collections
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* @method
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* @category Collection
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* @param {Array|Iterable|Object} coll - A collection to iterate over.
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* @param {AsyncFunction} iteratee - An async function to apply to each item in
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* `coll`.
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* The iteratee should complete with a value to use as the sort criteria as
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* its `result`.
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* Invoked with (item, callback).
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* @param {Function} callback - A callback which is called after all the
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* `iteratee` functions have finished, or an error occurs. Results is the items
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* from the original `coll` sorted by the values returned by the `iteratee`
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* calls. Invoked with (err, results).
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* @example
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*
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* async.sortBy(['file1','file2','file3'], function(file, callback) {
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* fs.stat(file, function(err, stats) {
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* callback(err, stats.mtime);
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* });
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* }, function(err, results) {
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* // results is now the original array of files sorted by
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* // modified date
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* });
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*
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* // By modifying the callback parameter the
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* // sorting order can be influenced:
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*
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* // ascending order
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* async.sortBy([1,9,3,5], function(x, callback) {
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* callback(null, x);
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* }, function(err,result) {
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* // result callback
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* });
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*
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* // descending order
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* async.sortBy([1,9,3,5], function(x, callback) {
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* callback(null, x*-1); //<- x*-1 instead of x, turns the order around
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* }, function(err,result) {
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* // result callback
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* });
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*/
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function sortBy(coll, iteratee, callback) {
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var _iteratee = (0, _wrapAsync2.default)(iteratee);
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(0, _map2.default)(coll, function (x, callback) {
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_iteratee(x, function (err, criteria) {
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if (err) return callback(err);
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callback(null, { value: x, criteria: criteria });
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});
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}, function (err, results) {
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if (err) return callback(err);
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callback(null, (0, _arrayMap2.default)(results.sort(comparator), (0, _baseProperty2.default)('value')));
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});
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function comparator(left, right) {
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var a = left.criteria,
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b = right.criteria;
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return a < b ? -1 : a > b ? 1 : 0;
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}
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}
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module.exports = exports['default'];
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