How to unlisten MDCDialog event

Question

I have a small function which listen to MDCDialog:closing.

The problem is, each time I run this function, it add a new listener.
So, I need to remove this same listener once I'm done using it.

So far, this is what I did:

function confirm() {
    mdcAlert.open();
    // start listening
    mdcAlert.listen("MDCDialog:closing", function(event) {
        {... execute what need to be done ...}

        // stop listening (not working)
        mdcAlert.unlisten("MDCDialog:closing");
    });
}

Do you happen to know how to use unlisten?

I can't figure out how to use it in the doc:
https://material.io/develop/web/components/dialogs/
https://pub.dev/documentation/mdc_web/latest/mdc_web/MDCComponent/unlisten.html

Answer 1

Found the solution.

Had to pass a variable with a function inside.

function confirm() {
    let eventListener=function(event) {
        {... execute what need to be done ...}

        //Unlisten after execution
        mdcAlert.unlisten("MDCDialog:closing", eventListener);
    };

    mdcAlert.open();
    mdcAlert.listen("MDCDialog:closing", eventListener);
}