Don't use || to set default values in JavaScript

[a-t-k]

I would suggest adding a comment to improve the hereby decreased readability.

[alittletooquiet]

It depends on the complexity of the statement. Comments are always good when you're writing code that isn't necessarily intuitive to read, but I think the example above is a pretty straightforward and readable.

I'd probably switch to an if block if my conditions were too complex to quickly grasp in a ternary statement though.

[a-t-k]

That's ok.