In my node.js app, I have a code snipplet to compose a csv array:

function process(alerts, callback) { var csvList = []; var alertsLength = alerts.length; alerts.forEach(function(alert) { var name = alert.name; var msg = alert.msg; // retrieve from database // NOTE: the asynchronous part! PersonDao.getContact(name, function(error, contact) { var csv = "csv:" + contact + "|" + msg; csvList.push(csv); if (csvList.length == alertsLength) { // execute callback with the csvList callback(csvList); } }); }); // end of alerts loop }

Is there any more elegant (or correct) way to do this?

Problem courtesy of: Kenny Ki

Solution

Just use 3rd party libraries for that.

var async = require('async'); function process(alerts, callback) { // v--- or async.map(...) to do it in parallel async.mapSeries(alerts, function(alert, cb) { PersonDao.getContact(alert.name, function(error, contact) { cb(error, "csv:" + contact + "|" + alert.msg); }); }, callback); }

Solution courtesy of: alex

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tags: alert,var,alerts,function,callback,csvList,csv,msg,contact,name,async,error,process
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