In a typed exception system, you just assign different kinds of exceptions to all of those. Java also distinguishes between checked exceptions ("known unknowns"

In a typed exception system, you just assign different kinds of exceptions to all of those. Java also distinguishes between checked exceptions ("known unknowns") which need to be declared, and runtime exceptions ("unknown unknowns"). Sure, you can still catch all of them in one place, but that's very rarely a good idea. A non-typed exception system (that doesn't solve the problem with another mechanism) just sounds like a very bad idea. Is Javascript like that?