value of "this" inside functions about async HOT 2 CLOSED

Yes, this the way JavaScript works when passing around references to functions. When calling a function, the context is essentially what comes before the '.', so calling test2 as myTest.test2(cb) would work, but doing:

var fn = myTest.test2;
fn(cb);

won't work. async.js has no knowledge of the myTest object, only the value of myTest.test2. You'll need to replace myTest.test2 in the async.series call with a function which calls it with the correct context like this:

async.series([
    test1,
    function (cb) {
        myTest.test2(cb);
    }
], ....

That will mean test2 is called with the correct value for this. Its possible to avoid the use of 'this' in some circumstances by using a closure. By using closures and a more functional style you can mostly avoid this headache.

Example using closure:

var MyTest = function(){
    var that = this;
    this.test2 = function (cb) {
        console.log('test2');
        console.log(that);
        setTimeout(cb,200);
    }
};

var myTest = new MyTest();

This stores a reference to 'this' in the variable 'that', which will stay in scope for the function test2, and is accessible from that function no matter how you call it later on.

Hope that helps

from async.

thanks for explanation :)
The thing is that the code defining MyTest.test2 is from another module (node-couchdb). I actually wrapped the calls in anonymous functions as in your example and It works of course. thank you.

from async.