import concatLimit from './concatLimit';
import awaitify from './internal/awaitify'

/**
 * Applies `iteratee` to each item in `coll`, concatenating the results. Returns
 * the concatenated list. The `iteratee`s are called in parallel, and the
 * results are concatenated as they return. The results array will be returned in
 * the original order of `coll` passed to the `iteratee` function.
 *
 * @name concat
 * @static
 * @memberOf module:Collections
 * @method
 * @category Collection
 * @alias flatMap
 * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
 * @param {AsyncFunction} iteratee - A function to apply to each item in `coll`,
 * which should use an array as its result. Invoked with (item, callback).
 * @param {Function} [callback] - A callback which is called after all the
 * `iteratee` functions have finished, or an error occurs. Results is an array
 * containing the concatenated results of the `iteratee` function. Invoked with
 * (err, results).
 * @returns A Promise, if no callback is passed
 * @example
 *
 * async.concat(['dir1','dir2','dir3'], fs.readdir, function(err, files) {
 *     // files is now a list of filenames that exist in the 3 directories
 * });
 */
function concat(coll, iteratee, callback) {
    return concatLimit(coll, Infinity, iteratee, callback)
}
export default awaitify(concat, 3);