Javascript Foreach Function Expected

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I am using a function which takes a callback paramater to which im passing my own function. I'm however getting the error function expected..
GpsGate.Server.MyService.getTracksByUser(groupName , user.username, getTracksByUser_callback());

function getTracksByUser_callback(result)
{
var responseData = '<response>';
result.tracks.foreach( //error on this line
function addTrack(track) {
responseData += '<track>';
//ommited
responseData += '</track>';
}
);
responseData += '</response>';
response.body = responseData;
}

looking at examples forEach Method (Array) (JavaScript) im unsure why it is not working
#programming #expected #foreach #function #javascript
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    Javascript Foreach Function Expected

    I am using a function which takes a callback paramater to which im passing my own function. I'm however getting the error function expected.. GpsGate.Server.MyService.getTracksByUser(groupName , user.username, getTracksByUser_callback());