HORIZON PROJECT

'use strict';

Object.defineProperty(exports, "__esModule", {

    value: true

});

exports.default = mapValuesLimit;

var _eachOfLimit = require('./eachOfLimit');

var _eachOfLimit2 = _interopRequireDefault(_eachOfLimit);

var _noop = require('lodash/noop');

var _noop2 = _interopRequireDefault(_noop);

var _once = require('./internal/once');

var _once2 = _interopRequireDefault(_once);

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

/**

 * The same as [`mapValues`]{@link module:Collections.mapValues} but runs a maximum of `limit` async operations at a

 * time.

 *

 * @name mapValuesLimit

 * @static

 * @memberOf module:Collections

 * @method

 * @see [async.mapValues]{@link module:Collections.mapValues}

 * @category Collection

 * @param {Object} obj - A collection to iterate over.

 * @param {number} limit - The maximum number of async operations at a time.

 * @param {Function} iteratee - A function to apply to each value in `obj`.

 * The iteratee is passed a `callback(err, transformed)` which must be called

 * once it has completed with an error (which can be `null`) and a

 * transformed value. Invoked with (value, key, callback).

 * @param {Function} [callback] - A callback which is called when all `iteratee`

 * functions have finished, or an error occurs. `result` is a new object consisting

 * of each key from `obj`, with each transformed value on the right-hand side.

 * Invoked with (err, result).

 */

function mapValuesLimit(obj, limit, iteratee, callback) {

    callback = (0, _once2.default)(callback || _noop2.default);

    var newObj = {};

    (0, _eachOfLimit2.default)(obj, limit, function (val, key, next) {

        iteratee(val, key, function (err, result) {

            if (err) return next(err);

            newObj[key] = result;

            next();

        });

    }, function (err) {

        callback(err, newObj);

    });

}

module.exports = exports['default'];