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Viewing file:     concatLimit.js (2.04 KB)      -rw-r--r--

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _wrapAsync = require('./internal/wrapAsync.js');

var _wrapAsync2 = _interopRequireDefault(_wrapAsync);

var _mapLimit = require('./mapLimit.js');

var _mapLimit2 = _interopRequireDefault(_mapLimit);

var _awaitify = require('./internal/awaitify.js');

var _awaitify2 = _interopRequireDefault(_awaitify);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * The same as [`concat`]{@link module:Collections.concat} but runs a maximum of `limit` async operations at a time.
 *
 * @name concatLimit
 * @static
 * @memberOf module:Collections
 * @method
 * @see [async.concat]{@link module:Collections.concat}
 * @category Collection
 * @alias flatMapLimit
 * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
 * @param {number} limit - The maximum number of async operations at a time.
 * @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
 */
function concatLimit(coll, limit, iteratee, callback) {
    var _iteratee = (0, _wrapAsync2.default)(iteratee);
    return (0, _mapLimit2.default)(coll, limit, (val, iterCb) => {
        _iteratee(val, (err, ...args) => {
            if (err) return iterCb(err);
            return iterCb(err, args);
        });
    }, (err, mapResults) => {
        var result = [];
        for (var i = 0; i < mapResults.length; i++) {
            if (mapResults[i]) {
                result = result.concat(...mapResults[i]);
            }
        }

        return callback(err, result);
    });
}
exports.default = (0, _awaitify2.default)(concatLimit, 4);
module.exports = exports.default;