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import eachOfLimit from './internal/eachOfLimit'
import awaitify from './internal/awaitify'
import noop from './internal/noop';
import once from './internal/once';
import wrapAsync from './internal/wrapAsync';
/**
* 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 {AsyncFunction} iteratee - A function to apply to each value and key
* in `coll`.
* The iteratee should complete with the transformed value as its result.
* 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).
* @returns {Promise} a promise, if no callback is passed
*/
function mapValuesLimit(obj, limit, iteratee, callback) {
callback = once(callback || noop);
var newObj = {};
var _iteratee = wrapAsync(iteratee)
return eachOfLimit(limit)(obj, (val, key, next) => {
_iteratee(val, key, (err, result) => {
if (err) return next(err);
newObj[key] = result;
next();
});
}, err => callback(err, newObj));
}
export default awaitify(mapValuesLimit, 4)
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