96 lines
3.2 KiB
JavaScript
96 lines
3.2 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
Object.defineProperty(exports, "__esModule", {
|
||
|
|
value: true
|
||
|
|
});
|
||
|
|
|
||
|
|
var _createTester = require('./internal/createTester.js');
|
||
|
|
|
||
|
|
var _createTester2 = _interopRequireDefault(_createTester);
|
||
|
|
|
||
|
|
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 the first value in `coll` that passes an async truth test. The
|
||
|
|
* `iteratee` is applied in parallel, meaning the first iteratee to return
|
||
|
|
* `true` will fire the detect `callback` with that result. That means the
|
||
|
|
* result might not be the first item in the original `coll` (in terms of order)
|
||
|
|
* that passes the test.
|
||
|
|
|
||
|
|
* If order within the original `coll` is important, then look at
|
||
|
|
* [`detectSeries`]{@link module:Collections.detectSeries}.
|
||
|
|
*
|
||
|
|
* @name detect
|
||
|
|
* @static
|
||
|
|
* @memberOf module:Collections
|
||
|
|
* @method
|
||
|
|
* @alias find
|
||
|
|
* @category Collections
|
||
|
|
* @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
|
||
|
|
* @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
|
||
|
|
* The iteratee must complete with a boolean value as its result.
|
||
|
|
* Invoked with (item, callback).
|
||
|
|
* @param {Function} [callback] - A callback which is called as soon as any
|
||
|
|
* iteratee returns `true`, or after all the `iteratee` functions have finished.
|
||
|
|
* Result will be the first item in the array that passes the truth test
|
||
|
|
* (iteratee) or the value `undefined` if none passed. Invoked with
|
||
|
|
* (err, result).
|
||
|
|
* @returns A Promise, if no callback is passed
|
||
|
|
* @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
|
||
|
|
*
|
||
|
|
* // asynchronous function that checks if a file exists
|
||
|
|
* function fileExists(file, callback) {
|
||
|
|
* fs.access(file, fs.constants.F_OK, (err) => {
|
||
|
|
* callback(null, !err);
|
||
|
|
* });
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* async.detect(['file3.txt','file2.txt','dir1/file1.txt'], fileExists,
|
||
|
|
* function(err, result) {
|
||
|
|
* console.log(result);
|
||
|
|
* // dir1/file1.txt
|
||
|
|
* // result now equals the first file in the list that exists
|
||
|
|
* }
|
||
|
|
*);
|
||
|
|
*
|
||
|
|
* // Using Promises
|
||
|
|
* async.detect(['file3.txt','file2.txt','dir1/file1.txt'], fileExists)
|
||
|
|
* .then(result => {
|
||
|
|
* console.log(result);
|
||
|
|
* // dir1/file1.txt
|
||
|
|
* // result now equals the first file in the list that exists
|
||
|
|
* }).catch(err => {
|
||
|
|
* console.log(err);
|
||
|
|
* });
|
||
|
|
*
|
||
|
|
* // Using async/await
|
||
|
|
* async () => {
|
||
|
|
* try {
|
||
|
|
* let result = await async.detect(['file3.txt','file2.txt','dir1/file1.txt'], fileExists);
|
||
|
|
* console.log(result);
|
||
|
|
* // dir1/file1.txt
|
||
|
|
* // result now equals the file in the list that exists
|
||
|
|
* }
|
||
|
|
* catch (err) {
|
||
|
|
* console.log(err);
|
||
|
|
* }
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
function detect(coll, iteratee, callback) {
|
||
|
|
return (0, _createTester2.default)(bool => bool, (res, item) => item)(_eachOf2.default, coll, iteratee, callback);
|
||
|
|
}
|
||
|
|
exports.default = (0, _awaitify2.default)(detect, 3);
|
||
|
|
module.exports = exports['default'];
|