import _map from './internal/map.js'
import eachOfSeries from './eachOfSeries.js'
import awaitify from './internal/awaitify.js'

/**
 * The same as [`map`]{@link module:Collections.map} but runs only a single async operation at a time.
 *
 * @name mapSeries
 * @static
 * @memberOf module:Collections
 * @method
 * @see [async.map]{@link module:Collections.map}
 * @category Collection
 * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
 * @param {AsyncFunction} iteratee - An async function to apply to each item in
 * `coll`.
 * The iteratee should complete with the transformed item.
 * Invoked with (item, callback).
 * @param {Function} [callback] - A callback which is called when all `iteratee`
 * functions have finished, or an error occurs. Results is an array of the
 * transformed items from the `coll`. Invoked with (err, results).
 * @returns {Promise} a promise, if no callback is passed
 */
function mapSeries (coll, iteratee, callback) {
    return _map(eachOfSeries, coll, iteratee, callback)
}
export default awaitify(mapSeries, 3);