Retrieving a SharePoint app URL using JSOM

At occasions, I need to call apps directly from other scripts. I then need the actual app web URL and cannot launch a dialog to find this.There are APIs out there to get this but the entire URL must be constructed.I know the app domain and redirect URL, but need to fetch the app web, i.e. the masquerade URL. To do this, I can use the following snippet:The key here is to send the app redirect URL together with a part of the app URL to check for.

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