@spalger/kibana/src/ui/public/courier/fetch/_for_each_strategy.js

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

define(function (require) {
  return function FetchForEachRequestStrategy(Private, Promise) {
    var _ = require('lodash');

    function forEachStrategy(requests, block) {
      block = Promise.method(block);
      var sets = [];

      requests.forEach(function (req) {
        var strategy = req.strategy;
        var set = _.find(sets, { 0: strategy });
        if (set) set[1].push(req);
        else sets.push([strategy, [req]]);
      });

      return Promise.all(sets.map(function (set) {
        return block(set[0], set[1]);
      }));
    }

    return forEachStrategy;
  };
});