1 | ;
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.default = sortBy;
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7 |
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8 | var _arrayMap = require('lodash/_arrayMap');
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9 |
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10 | var _arrayMap2 = _interopRequireDefault(_arrayMap);
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11 |
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12 | var _baseProperty = require('lodash/_baseProperty');
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13 |
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14 | var _baseProperty2 = _interopRequireDefault(_baseProperty);
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15 |
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16 | var _map = require('./map');
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17 |
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18 | var _map2 = _interopRequireDefault(_map);
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19 |
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20 | var _wrapAsync = require('./internal/wrapAsync');
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21 |
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22 | var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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23 |
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24 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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25 |
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26 | /**
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27 | * Sorts a list by the results of running each `coll` value through an async
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28 | * `iteratee`.
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29 | *
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30 | * @name sortBy
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31 | * @static
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32 | * @memberOf module:Collections
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33 | * @method
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34 | * @category Collection
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35 | * @param {Array|Iterable|Object} coll - A collection to iterate over.
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36 | * @param {AsyncFunction} iteratee - An async function to apply to each item in
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37 | * `coll`.
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38 | * The iteratee should complete with a value to use as the sort criteria as
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39 | * its `result`.
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40 | * Invoked with (item, callback).
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41 | * @param {Function} callback - A callback which is called after all the
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42 | * `iteratee` functions have finished, or an error occurs. Results is the items
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43 | * from the original `coll` sorted by the values returned by the `iteratee`
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44 | * calls. Invoked with (err, results).
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45 | * @example
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46 | *
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47 | * async.sortBy(['file1','file2','file3'], function(file, callback) {
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48 | * fs.stat(file, function(err, stats) {
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49 | * callback(err, stats.mtime);
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50 | * });
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51 | * }, function(err, results) {
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52 | * // results is now the original array of files sorted by
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53 | * // modified date
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54 | * });
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55 | *
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56 | * // By modifying the callback parameter the
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57 | * // sorting order can be influenced:
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58 | *
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59 | * // ascending order
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60 | * async.sortBy([1,9,3,5], function(x, callback) {
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61 | * callback(null, x);
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62 | * }, function(err,result) {
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63 | * // result callback
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64 | * });
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65 | *
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66 | * // descending order
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67 | * async.sortBy([1,9,3,5], function(x, callback) {
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68 | * callback(null, x*-1); //<- x*-1 instead of x, turns the order around
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69 | * }, function(err,result) {
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70 | * // result callback
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71 | * });
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72 | */
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73 | function sortBy(coll, iteratee, callback) {
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74 | var _iteratee = (0, _wrapAsync2.default)(iteratee);
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75 | (0, _map2.default)(coll, function (x, callback) {
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76 | _iteratee(x, function (err, criteria) {
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77 | if (err) return callback(err);
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78 | callback(null, { value: x, criteria: criteria });
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79 | });
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80 | }, function (err, results) {
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81 | if (err) return callback(err);
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82 | callback(null, (0, _arrayMap2.default)(results.sort(comparator), (0, _baseProperty2.default)('value')));
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83 | });
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84 |
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85 | function comparator(left, right) {
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86 | var a = left.criteria,
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87 | b = right.criteria;
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88 | return a < b ? -1 : a > b ? 1 : 0;
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89 | }
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90 | }
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91 | module.exports = exports['default']; |
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