We always put a new line after the `var instance = this;` line, and we never start variables with `is`.
The reason for the variable name is because there are cases where you may wish to expose that as a property with a method, so you would have something like: `isIsMyselfAvailable`, or in this case, you've changed the name of the function, but it's somewhat convoluted.
I would just probably do: `isAvailable` (and the variable inside would be just `var available`) and for the user one, I would do `isUserAvailable` (the fact that we're in the video manager should make it clear that we're checking for availability for video).
`isMyselfAvailable` just sounds a bit weird when reading it.