source: trip-planner-front/node_modules/async/transform.js@ 188ee53

Last change on this file since 188ee53 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1'use strict';
2
3Object.defineProperty(exports, "__esModule", {
4 value: true
5});
6exports.default = transform;
7
8var _isArray = require('lodash/isArray');
9
10var _isArray2 = _interopRequireDefault(_isArray);
11
12var _noop = require('lodash/noop');
13
14var _noop2 = _interopRequireDefault(_noop);
15
16var _eachOf = require('./eachOf');
17
18var _eachOf2 = _interopRequireDefault(_eachOf);
19
20var _once = require('./internal/once');
21
22var _once2 = _interopRequireDefault(_once);
23
24var _wrapAsync = require('./internal/wrapAsync');
25
26var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
27
28function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
29
30/**
31 * A relative of `reduce`. Takes an Object or Array, and iterates over each
32 * element in series, each step potentially mutating an `accumulator` value.
33 * The type of the accumulator defaults to the type of collection passed in.
34 *
35 * @name transform
36 * @static
37 * @memberOf module:Collections
38 * @method
39 * @category Collection
40 * @param {Array|Iterable|Object} coll - A collection to iterate over.
41 * @param {*} [accumulator] - The initial state of the transform. If omitted,
42 * it will default to an empty Object or Array, depending on the type of `coll`
43 * @param {AsyncFunction} iteratee - A function applied to each item in the
44 * collection that potentially modifies the accumulator.
45 * Invoked with (accumulator, item, key, callback).
46 * @param {Function} [callback] - A callback which is called after all the
47 * `iteratee` functions have finished. Result is the transformed accumulator.
48 * Invoked with (err, result).
49 * @example
50 *
51 * async.transform([1,2,3], function(acc, item, index, callback) {
52 * // pointless async:
53 * process.nextTick(function() {
54 * acc.push(item * 2)
55 * callback(null)
56 * });
57 * }, function(err, result) {
58 * // result is now equal to [2, 4, 6]
59 * });
60 *
61 * @example
62 *
63 * async.transform({a: 1, b: 2, c: 3}, function (obj, val, key, callback) {
64 * setImmediate(function () {
65 * obj[key] = val * 2;
66 * callback();
67 * })
68 * }, function (err, result) {
69 * // result is equal to {a: 2, b: 4, c: 6}
70 * })
71 */
72function transform(coll, accumulator, iteratee, callback) {
73 if (arguments.length <= 3) {
74 callback = iteratee;
75 iteratee = accumulator;
76 accumulator = (0, _isArray2.default)(coll) ? [] : {};
77 }
78 callback = (0, _once2.default)(callback || _noop2.default);
79 var _iteratee = (0, _wrapAsync2.default)(iteratee);
80
81 (0, _eachOf2.default)(coll, function (v, k, cb) {
82 _iteratee(accumulator, v, k, cb);
83 }, function (err) {
84 callback(err, accumulator);
85 });
86}
87module.exports = exports['default'];
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