1'use strict';
2
3Object.defineProperty(exports, "__esModule", {
4  value: true
5});
6
7var _concatLimit = require('./concatLimit.js');
8
9var _concatLimit2 = _interopRequireDefault(_concatLimit);
10
11var _awaitify = require('./internal/awaitify.js');
12
13var _awaitify2 = _interopRequireDefault(_awaitify);
14
15function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
16
17/**
18 * Applies `iteratee` to each item in `coll`, concatenating the results. Returns
19 * the concatenated list. The `iteratee`s are called in parallel, and the
20 * results are concatenated as they return. The results array will be returned in
21 * the original order of `coll` passed to the `iteratee` function.
22 *
23 * @name concat
24 * @static
25 * @memberOf module:Collections
26 * @method
27 * @category Collection
28 * @alias flatMap
29 * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
30 * @param {AsyncFunction} iteratee - A function to apply to each item in `coll`,
31 * which should use an array as its result. Invoked with (item, callback).
32 * @param {Function} [callback] - A callback which is called after all the
33 * `iteratee` functions have finished, or an error occurs. Results is an array
34 * containing the concatenated results of the `iteratee` function. Invoked with
35 * (err, results).
36 * @returns A Promise, if no callback is passed
37 * @example
38 *
39 * // dir1 is a directory that contains file1.txt, file2.txt
40 * // dir2 is a directory that contains file3.txt, file4.txt
41 * // dir3 is a directory that contains file5.txt
42 * // dir4 does not exist
43 *
44 * let directoryList = ['dir1','dir2','dir3'];
45 * let withMissingDirectoryList = ['dir1','dir2','dir3', 'dir4'];
46 *
47 * // Using callbacks
48 * async.concat(directoryList, fs.readdir, function(err, results) {
49 *    if (err) {
50 *        console.log(err);
51 *    } else {
52 *        console.log(results);
53 *        // [ 'file1.txt', 'file2.txt', 'file3.txt', 'file4.txt', file5.txt ]
54 *    }
55 * });
56 *
57 * // Error Handling
58 * async.concat(withMissingDirectoryList, fs.readdir, function(err, results) {
59 *    if (err) {
60 *        console.log(err);
61 *        // [ Error: ENOENT: no such file or directory ]
62 *        // since dir4 does not exist
63 *    } else {
64 *        console.log(results);
65 *    }
66 * });
67 *
68 * // Using Promises
69 * async.concat(directoryList, fs.readdir)
70 * .then(results => {
71 *     console.log(results);
72 *     // [ 'file1.txt', 'file2.txt', 'file3.txt', 'file4.txt', file5.txt ]
73 * }).catch(err => {
74 *      console.log(err);
75 * });
76 *
77 * // Error Handling
78 * async.concat(withMissingDirectoryList, fs.readdir)
79 * .then(results => {
80 *     console.log(results);
81 * }).catch(err => {
82 *     console.log(err);
83 *     // [ Error: ENOENT: no such file or directory ]
84 *     // since dir4 does not exist
85 * });
86 *
87 * // Using async/await
88 * async () => {
89 *     try {
90 *         let results = await async.concat(directoryList, fs.readdir);
91 *         console.log(results);
92 *         // [ 'file1.txt', 'file2.txt', 'file3.txt', 'file4.txt', file5.txt ]
93 *     } catch (err) {
94 *         console.log(err);
95 *     }
96 * }
97 *
98 * // Error Handling
99 * async () => {
100 *     try {
101 *         let results = await async.concat(withMissingDirectoryList, fs.readdir);
102 *         console.log(results);
103 *     } catch (err) {
104 *         console.log(err);
105 *         // [ Error: ENOENT: no such file or directory ]
106 *         // since dir4 does not exist
107 *     }
108 * }
109 *
110 */
111function concat(coll, iteratee, callback) {
112  return (0, _concatLimit2.default)(coll, Infinity, iteratee, callback);
113}
114exports.default = (0, _awaitify2.default)(concat, 3);
115module.exports = exports['default'];