Disable error propagation

Functions that usually throw an error, in some cases, don't throw an error. In some cases, you may know that calling a function like these with some kind of parameters will never throw an error. In that case, Swift gives you an option to disable error propagation via calling this method with try! instead of try. Calling throwing functions via try! will disable error propagation, and if an error is thrown in that case, you will get a runtime error. So, it's better to take care while using try!.