Better way to extract array of objects from Redis on node.js using CoffeeScript -

please review code below , suggest more elegant ways of doing same.

i storing json strings in redis database. extract array of objects, use following code works. learning though wanted find better ways of doing same. here coffeescript code:

redis = require "redis" client = module.exports.client = redis.createclient()  getrecord = module.exports.getrecord = (key, fn) ->   client.get key, (err, result) ->     fn err, null if err     obj = json.parse(result)     fn null, obj  getdataset = module.exports.getdataset = (pattern, fn) ->   client.keys pattern, (err, result) ->     fn err, null if err     dataset = []     length = result.length     count = 0     key in result       getrecord key, (err, obj) ->         fn err, null if err         count = count + 1         dataset.push obj         fn null, dataset if count length 

i think code pretty solid. warned your

for key in result 

loop creating list comprehension; means if result.length large, you're going see significant performance overhead , perhaps memory issues. avoid this, need add explicit return:

for key in result   getrecord key, (err, obj) ->     ... return 

there proposal introduce void function syntax such cases, none of coffeescript's core committers seem fond of it.