problem about node-async-Collection of common programming errors

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  lemulot
  node.js error-handling express waterfall node-async
  I don’t see why expressjs don’t handle error when it’s throw in async.waterfallvar express = require(‘express’) , app = express.createServer() , async = require(‘async’);app.use(express.errorHandler({dumpExceptions: true,showStack: true }));app.get(‘/error’, function(req, res){throw Error(‘Aie’); });app.get(‘/asyncerror’, function(req, res){var that = this;async.waterfall([function(next){console.log(‘1’);next(“42”, “2”);},function(arg, next) {console.log(arg);res.json(‘ok’);}], function(err){con
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  Tolga E
  javascript json node.js node-async
  I basically need to make about 3 calls to get the data for a json object.. It basically JSON array of JSON object which have some attributes, one of which is an array of other values selected using a second query, then that one also has an array inside which is selected with another db call.I tried using asyn.concatSeries so that I can dig down into the bottom call and put together all the information I collected for one root json object but that’s creating a lot of unexpected behaviour..Exampl
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  hippietrail
  javascript node.js async.js node-async
  Here I’m trying to make an array of functions with arguments to Async.js.The array consists of instances of RunRequest that are supposed to be set inside the loop in MakeRequest, right before I try pass the function array to Async.So the request in request[i] is fine when I pass it to RunRequest, but inside RunRequest function its undefined?// Process Requests function RunRequest(db, collection, request, requestHandler, callback) {console.log(‘this happening?’)// Connect to the databasedb.open(f
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  Munim
  xml node.js node-async
  I have to process a large XML file (around 25 mb in size), and organize the data into documents to import into MongoDB. The issue is, there are around 5-6 types of elements in the xml document, each with around 10k rows. After fetching one xml node of type a, I have to fetch it’s corresponding elements of types b,c,d, etc.What I am trying to do in node:Fetch all the rows of type a. For each row, using xpath, find its corresponding related rows, and create the document. Insert document in mongo
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  hippietrail
  javascript node.js loops async.js node-async
  The popular node.js module async includes functions for collections and control flow which, with versions of some which can be operate in parallel or in series.But among them I cannot find a way to construct a loop which operates in series.I’m trying to do the same as this pseudocode:forever {l = getline();if (l === undefined) {break;} else {doStuff(l);} }If I wanted all the calls to getLine() to be called in parallel I could use async.whilst. If I wanted to iterate over an array rather than mak
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  hippietrail
  node.js async.js node-async
  I’m working with the parallel function in Async.js and for some reason the final call back is not getting executed and I do not see an error happening anywhere. I’m dynamically creating an array of functions that are passed to the parallel call as such: // ‘theFiles’ is an array of files I’m working with in a code-generator style type of scenario var callItems = []; theFiles.forEach(function(currentFile) {var genFileFunc = generateFileFunc(destDir + “/” + currentFile, packageName, appName);callI

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