Short example for working with async massively

collections.js

var _ = require('lodash');
var async = require('async');

var db = require('../lib/mongoskin');

async.waterfall([
    function(cb) { db.collections(cb); },
    function(collections, cb) {
        async.map(collections, function(collection, cb) {
            var data = {
                name: collection.collectionName
            };

            async.waterfall([
                function(cb) { collection.count(cb); },
                function(count, cb) {
                    data.count = count;
                    cb();
                }
            ], function(err) {
                cb(err, data)
            });
        }, cb);
    }
], function(err, data) {
    if (err) {
        console.log("Err encountered: ", err);
    } else {
        console.log(data);
        db.close();
    }
});