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    This is unnecessarily complicated. At the very least you could write this.callback = function() { parent.callbackFunctionOfParent() } but I'm sure this could be simplified a lot more depending on what you are actually trying to achieve.
    – Felix Kling
    Commented May 10, 2023 at 15:53
  • The question was about accessing 'this' in the context of the derived class, not what is the simplest way to call a function on the parent class.
    – ejectamenta
    Commented May 11, 2023 at 18:33
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    But why would you present a solution that is more difficult to understand? Solutions should be reduced to the absolute minimum so that they are easy to understand. According to your argument I could provide the following solution to the question "how to add two numbers" and it would be ok? function mul(x, y) { return x * y; } function add(x, y) { return mul(x, 1) + mul(y, 1); }; add(41, 1)
    – Felix Kling
    Commented May 12, 2023 at 11:36
  • I think you are free to edit the post and make it more terse, if it is still understandable and gives the same result on "run code snippet", then I have no problem with this.
    – ejectamenta
    Commented May 15, 2023 at 15:50