diff options
Diffstat (limited to 'node_modules/async/select.js')
-rw-r--r-- | node_modules/async/select.js | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/node_modules/async/select.js b/node_modules/async/select.js new file mode 100644 index 0000000..303dc1f --- /dev/null +++ b/node_modules/async/select.js @@ -0,0 +1,93 @@ +'use strict'; + +Object.defineProperty(exports, "__esModule", { + value: true +}); + +var _filter2 = require('./internal/filter.js'); + +var _filter3 = _interopRequireDefault(_filter2); + +var _eachOf = require('./eachOf.js'); + +var _eachOf2 = _interopRequireDefault(_eachOf); + +var _awaitify = require('./internal/awaitify.js'); + +var _awaitify2 = _interopRequireDefault(_awaitify); + +function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } + +/** + * Returns a new array of all the values in `coll` which pass an async truth + * test. This operation is performed in parallel, but the results array will be + * in the same order as the original. + * + * @name filter + * @static + * @memberOf module:Collections + * @method + * @alias select + * @category Collection + * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over. + * @param {Function} iteratee - A truth test to apply to each item in `coll`. + * The `iteratee` is passed a `callback(err, truthValue)`, which must be called + * with a boolean argument once it has completed. Invoked with (item, callback). + * @param {Function} [callback] - A callback which is called after all the + * `iteratee` functions have finished. Invoked with (err, results). + * @returns {Promise} a promise, if no callback provided + * @example + * + * // dir1 is a directory that contains file1.txt, file2.txt + * // dir2 is a directory that contains file3.txt, file4.txt + * // dir3 is a directory that contains file5.txt + * + * const files = ['dir1/file1.txt','dir2/file3.txt','dir3/file6.txt']; + * + * // asynchronous function that checks if a file exists + * function fileExists(file, callback) { + * fs.access(file, fs.constants.F_OK, (err) => { + * callback(null, !err); + * }); + * } + * + * // Using callbacks + * async.filter(files, fileExists, function(err, results) { + * if(err) { + * console.log(err); + * } else { + * console.log(results); + * // [ 'dir1/file1.txt', 'dir2/file3.txt' ] + * // results is now an array of the existing files + * } + * }); + * + * // Using Promises + * async.filter(files, fileExists) + * .then(results => { + * console.log(results); + * // [ 'dir1/file1.txt', 'dir2/file3.txt' ] + * // results is now an array of the existing files + * }).catch(err => { + * console.log(err); + * }); + * + * // Using async/await + * async () => { + * try { + * let results = await async.filter(files, fileExists); + * console.log(results); + * // [ 'dir1/file1.txt', 'dir2/file3.txt' ] + * // results is now an array of the existing files + * } + * catch (err) { + * console.log(err); + * } + * } + * + */ +function filter(coll, iteratee, callback) { + return (0, _filter3.default)(_eachOf2.default, coll, iteratee, callback); +} +exports.default = (0, _awaitify2.default)(filter, 3); +module.exports = exports['default'];
\ No newline at end of file |