import createTester from './internal/createTester.js'
import eachOf from './eachOf.js'
import awaitify from './internal/awaitify.js'
/**
* 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 {Promise} a promise, if a callback is omitted
* @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 createTester(bool => bool, (res, item) => item)(eachOf, coll, iteratee, callback)
}
export default awaitify(detect, 3)
