gistfile1.js

request = function(url, func ){
  setTimeout(function(){
    console.log("REQUEST", url, func);

    func();
  }, 1);
}

function Source(url){
    this.url = url;
    this.morelinks = ['NO CHANGE'];
    var self = this;
    this.calculate = function(url){
 
      console.log("Calculating: " + self.url);
      console.log('1: ' + self.morelinks)
 
      var parse = function(err,resp,body){
        console.log('3: ' + self.morelinks)
        self.morelinks.push("ADDED ONE");
      } 
 
      request(self.url, parse);
      console.log('4: ' + myResults.morelinks)
    }
  }

myResults = new Source('http://www.reddit.com/r/videos');
myResults.calculate();

Ned: as a rule, everytime you enter a new function this refers to the function you are in.

Ned: so you loose the definitions on this you defined

Ned: but if you keep a reference to the object you care about you can just refer to that variable