`try` is different from `try!`. the new lonely operator is like `try!`, which asks only if the object is nil and then calls the method on it if it's not (and wi

`try` is different from `try!`. the new lonely operator is like `try!`, which asks only if the object is nil and then calls the method on it if it's not (and will blow up if the object doesn't have the method publically defined). `try`, in contrast, asks if the object is nil or responds to the method and returns nil if it doesn't.