Hello.

This post addresses the search query "c# instanceof" by clarifying that C# uses "is" and "as" keywords instead of "instanceof" for type checking and casting. The "is" keyword checks an object's type, while "as" performs a safe cast, returning null if the cast fails, unlike an explicit cast which throws an exception.

I've updated the OPML JavaScript Object Model to support OPML Attributes for Outlines, increasing flexibility for developers. I've also incorporated an instanceOf method (source unknown - please let me know if you recognize it!) to add type checking when inserting OPMLOutlineAttributes into the attribute array. The added instanceOf function is as follows:

function instanceOf(object, constructor)  while (object != null) {       if (object == constructor.prototype)          return true;       object = object.__proto__;    }    return false; }