1) The typing isn't actually optional, you just don't have to write it as long as it can be inferred, which is the best of both worlds. If you're ever unsure of

1) The typing isn't actually optional, you just don't have to write it as long as it can be inferred, which is the best of both worlds. If you're ever unsure of which type it is just mouse over in the ide, or specify it and wait for an error 2) not sure what you mean here