93 lines
2.8 KiB
JavaScript
93 lines
2.8 KiB
JavaScript
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'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 _filter2 = require('./internal/filter.js');
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var _filter3 = _interopRequireDefault(_filter2);
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var _eachOf = require('./eachOf.js');
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var _eachOf2 = _interopRequireDefault(_eachOf);
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var _awaitify = require('./internal/awaitify.js');
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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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* Returns a new array of all the values in `coll` which pass an async truth
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* test. This operation is performed in parallel, but the results array will be
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* in the same order as the original.
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*
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* @name filter
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* @static
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* @memberOf module:Collections
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* @method
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* @alias select
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* @category Collection
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* @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
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* @param {Function} iteratee - A truth test to apply to each item in `coll`.
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* The `iteratee` is passed a `callback(err, truthValue)`, which must be called
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* with a boolean argument once it has completed. 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. Invoked with (err, results).
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* @returns {Promise} a promise, if no callback provided
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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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*
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* const files = ['dir1/file1.txt','dir2/file3.txt','dir3/file6.txt'];
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*
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* // asynchronous function that checks if a file exists
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* function fileExists(file, callback) {
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* fs.access(file, fs.constants.F_OK, (err) => {
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* callback(null, !err);
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* });
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* }
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*
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* // Using callbacks
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* async.filter(files, fileExists, 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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* // [ 'dir1/file1.txt', 'dir2/file3.txt' ]
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* // results is now an array of the existing files
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* }
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* });
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*
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* // Using Promises
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* async.filter(files, fileExists)
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* .then(results => {
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* console.log(results);
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* // [ 'dir1/file1.txt', 'dir2/file3.txt' ]
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* // results is now an array of the existing files
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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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* // Using async/await
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* async () => {
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* try {
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* let results = await async.filter(files, fileExists);
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* console.log(results);
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* // [ 'dir1/file1.txt', 'dir2/file3.txt' ]
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* // results is now an array of the existing files
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* }
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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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*/
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function filter(coll, iteratee, callback) {
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return (0, _filter3.default)(_eachOf2.default, coll, iteratee, callback);
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}
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exports.default = (0, _awaitify2.default)(filter, 3);
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module.exports = exports['default'];
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