aaac7fed
 liuqimichale
add
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'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = function (coll, limit, iteratee, callback) {
callback = callback || _noop2.default;
var _iteratee = (0, _wrapAsync2.default)(iteratee);
(0, _mapLimit2.default)(coll, limit, function (val, callback) {
_iteratee(val, function (err, key) {
if (err) return callback(err);
return callback(null, { key: key, val: val });
});
}, function (err, mapResults) {
var result = {};
// from MDN, handle object having an `hasOwnProperty` prop
var hasOwnProperty = Object.prototype.hasOwnProperty;
for (var i = 0; i < mapResults.length; i++) {
if (mapResults[i]) {
var key = mapResults[i].key;
var val = mapResults[i].val;
if (hasOwnProperty.call(result, key)) {
result[key].push(val);
} else {
result[key] = [val];
}
}
}
return callback(err, result);
});
};
var _noop = require('lodash/noop');
var _noop2 = _interopRequireDefault(_noop);
var _mapLimit = require('./mapLimit');
var _mapLimit2 = _interopRequireDefault(_mapLimit);
var _wrapAsync = require('./internal/wrapAsync');
var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
;
/**
* The same as [`groupBy`]{@link module:Collections.groupBy} but runs a maximum of `limit` async operations at a time.
*
* @name groupByLimit
* @static
* @memberOf module:Collections
* @method
* @see [async.groupBy]{@link module:Collections.groupBy}
* @category Collection
* @param {Array|Iterable|Object} coll - A collection to iterate over.
* @param {number} limit - The maximum number of async operations at a time.
* @param {AsyncFunction} iteratee - An async function to apply to each item in
* `coll`.
* The iteratee should complete with a `key` to group the value under.
* Invoked with (value, callback).
* @param {Function} [callback] - A callback which is called when all `iteratee`
* functions have finished, or an error occurs. Result is an `Object` whoses
* properties are arrays of values which returned the corresponding key.
*/
module.exports = exports['default'];
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