In the above example, it throws an exception that is throw 'e'.
A throw exception accepts one parameter (in this case character 'e'), which is passed as an argument to the exception handler.
Exception handler is declared with the catch keyword. It is mandatory to write catch block after the try block.
Catch block is similar to regular function which always has at least one parameter and the type of the parameter is very important because, the type of the parameter/argument passed by the throw exception is checked against it, and only in the case they match, the exception is caught.
Throw statement is executed when the handler matches its type with the argument which is specified in the statement.
