How to pass values to a callback function at the time of the request call?

Question

I have the following situation:

var foo = [ 0, 1, 2 ]
for (var i in foo) {
    Asyncstuff.get(URI).on(\'response\', function(res) { console.log(i); } });
}
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Answer 1

You need a closure. There are better ways than this, but this should clearly demonstrate the concept:

var foo = [ 0, 1, 2 ]
for (var i in foo) {
    (function(i){
        Asyncstuff.get(URI).on('response', function(res) { console.log(i); } });
    })(i);
}