96 lines
3.2 KiB
JavaScript
96 lines
3.2 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 _createTester = require('./internal/createTester.js');
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var _createTester2 = _interopRequireDefault(_createTester);
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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 the first value in `coll` that passes an async truth test. The
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* `iteratee` is applied in parallel, meaning the first iteratee to return
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* `true` will fire the detect `callback` with that result. That means the
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* result might not be the first item in the original `coll` (in terms of order)
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* that passes the test.
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* If order within the original `coll` is important, then look at
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* [`detectSeries`]{@link module:Collections.detectSeries}.
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*
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* @name detect
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* @static
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* @memberOf module:Collections
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* @method
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* @alias find
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* @category Collections
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* @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
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* @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
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* The iteratee must complete with a boolean value as its result.
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* Invoked with (item, callback).
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* @param {Function} [callback] - A callback which is called as soon as any
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* iteratee returns `true`, or after all the `iteratee` functions have finished.
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* Result will be the first item in the array that passes the truth test
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* (iteratee) or the value `undefined` if none passed. Invoked with
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* (err, result).
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* @returns {Promise} a promise, if a callback is omitted
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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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* // 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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* async.detect(['file3.txt','file2.txt','dir1/file1.txt'], fileExists,
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* function(err, result) {
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* console.log(result);
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* // dir1/file1.txt
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* // result now equals the first file in the list that exists
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* }
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*);
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*
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* // Using Promises
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* async.detect(['file3.txt','file2.txt','dir1/file1.txt'], fileExists)
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* .then(result => {
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* console.log(result);
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* // dir1/file1.txt
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* // result now equals the first file in the list that exists
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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 result = await async.detect(['file3.txt','file2.txt','dir1/file1.txt'], fileExists);
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* console.log(result);
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* // dir1/file1.txt
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* // result now equals the file in the list that exists
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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 detect(coll, iteratee, callback) {
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return (0, _createTester2.default)(bool => bool, (res, item) => item)(_eachOf2.default, coll, iteratee, callback);
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}
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exports.default = (0, _awaitify2.default)(detect, 3);
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module.exports = exports['default'];
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