NodeJS async: Access results of forEach loop

Question

I'm using async for NodeJS and iterating over an array as follows:

var async = require('async')

async.forEach(myArray, function (entry, callback) {
  callback(null, entry["value"] + 1)
}, function (error, axResults_p) {
  console.log(arguments)
})

My problem is, that I cannot access the second parameter passed to the callback function. console.log(arguments) shows only one entry. But as far as I know, the first entry is reserved to check for errors.

So, anyone knows what I'm doing wrong/how I can access the results (entry["value"]+1)?

Thanks in advance!

Abhilash Km · Accepted Answer · 2017-11-28 19:48:31Z

1

Use async.map, async.parallel instead, each if you want the result from the iterate function.

answered Nov 28, 2017 at 19:48

Abhilash Km

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4 Comments

nrgyzer Over a year ago

Ok, but it seems that I cannot pass an array to async.parallel or async.series as first parameter. It always throws an Exception: TypeError: wrapAsync(...) is not a function when I replace forEach with series or parallel.

Abhilash Km Over a year ago

try this var async = require('async') async.map(myArray, function (entry, callback) { callback(null, entry["value"] + 1) }, function (error, axResults_p) { console.log(arguments) })

Abhilash Km Over a year ago

try async.map

Abhilash Km Over a year ago

asyc.parallel expects a list of functions as the first argument.

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