115 lines
3.6 KiB
JavaScript
115 lines
3.6 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _concatLimit = require('./concatLimit');
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var _concatLimit2 = _interopRequireDefault(_concatLimit);
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var _awaitify = require('./internal/awaitify');
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var _awaitify2 = _interopRequireDefault(_awaitify);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Applies `iteratee` to each item in `coll`, concatenating the results. Returns
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* the concatenated list. The `iteratee`s are called in parallel, and the
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* results are concatenated as they return. The results array will be returned in
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* the original order of `coll` passed to the `iteratee` function.
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*
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* @name concat
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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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* @alias flatMap
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* @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
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* @param {AsyncFunction} iteratee - A function to apply to each item in `coll`,
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* which should use an array as its result. 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 an array
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* containing the concatenated results of the `iteratee` function. Invoked with
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* (err, results).
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* @returns A Promise, if no callback is passed
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* @example
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*
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* // dir1 is a directory that contains file1.txt, file2.txt
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* // dir2 is a directory that contains file3.txt, file4.txt
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* // dir3 is a directory that contains file5.txt
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* // dir4 does not exist
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*
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* let directoryList = ['dir1','dir2','dir3'];
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* let withMissingDirectoryList = ['dir1','dir2','dir3', 'dir4'];
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*
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* // Using callbacks
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* async.concat(directoryList, fs.readdir, function(err, results) {
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* if (err) {
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* console.log(err);
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* } else {
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* console.log(results);
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* // [ 'file1.txt', 'file2.txt', 'file3.txt', 'file4.txt', file5.txt ]
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* }
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* });
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*
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* // Error Handling
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* async.concat(withMissingDirectoryList, fs.readdir, function(err, results) {
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* if (err) {
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* console.log(err);
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* // [ Error: ENOENT: no such file or directory ]
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* // since dir4 does not exist
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* } else {
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* console.log(results);
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* }
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* });
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*
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* // Using Promises
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* async.concat(directoryList, fs.readdir)
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* .then(results => {
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* console.log(results);
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* // [ 'file1.txt', 'file2.txt', 'file3.txt', 'file4.txt', file5.txt ]
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* }).catch(err => {
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* console.log(err);
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* });
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*
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* // Error Handling
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* async.concat(withMissingDirectoryList, fs.readdir)
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* .then(results => {
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* console.log(results);
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* }).catch(err => {
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* console.log(err);
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* // [ Error: ENOENT: no such file or directory ]
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* // since dir4 does not exist
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* });
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*
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* // Using async/await
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* async () => {
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* try {
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* let results = await async.concat(directoryList, fs.readdir);
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* console.log(results);
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* // [ 'file1.txt', 'file2.txt', 'file3.txt', 'file4.txt', file5.txt ]
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* } catch (err) {
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* console.log(err);
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* }
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* }
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*
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* // Error Handling
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* async () => {
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* try {
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* let results = await async.concat(withMissingDirectoryList, fs.readdir);
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* console.log(results);
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* } catch (err) {
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* console.log(err);
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* // [ Error: ENOENT: no such file or directory ]
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* // since dir4 does not exist
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* }
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* }
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*
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*/
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function concat(coll, iteratee, callback) {
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return (0, _concatLimit2.default)(coll, Infinity, iteratee, callback);
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}
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exports.default = (0, _awaitify2.default)(concat, 3);
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module.exports = exports['default']; |