node.js async.series not working

Question

This piece of code was taken straight out of the example from: https://github.com/caolan/async#seriestasks-callback

var async = require("async");
async.series([
    function() { console.log("a"); },
    function() { console.log("b"); }
], function(err, results){
    console.log(err);
    console.log(results);
});

However it doesn’t work. It stops after printing "a".

Is it a bug with the latest build of async module or my usage have some issue?

JohnnyHK · Accepted Answer · 2012-05-28 04:09:44Z

19

The functions you provide in the array passed into async.series need to accept a callback parameter that the function calls when the task is complete. So you'd want to do this instead:

async.series([
    function(callback){ 
        console.log("a"); 
        callback();
    },
    function(callback){ 
        console.log("b");
        callback();
    }
]...

answered May 28, 2012 at 4:09

JohnnyHK

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6 Comments

Soyeed Over a year ago

it works. But i wonder why in their wiki they mention it this way async.series([ function(){ ... }, function(){ ... } ]);

Anderson Green Over a year ago

where is callback initialized here?

Anderson Green Over a year ago

This function appears to work even when I replace callback with callbach. Why does it work like this?

JohnnyHK Over a year ago

@AndersonGreen The callback parameter is provided by the async framework when it calls your methods. It's saying to you: 'call this callback method when your function has completed its work'.

Anderson Green Over a year ago

Whenever I invoke (one function using async.series) inside (another function using async.series), it calls the functions in the wrong order, as detailed here: stackoverflow.com/questions/12554017/…

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