While some languages only use exceptions for truly exceptional circumstances like run time errors ruby uses exceptions for a wide variety of errors and unexpected results.
Ruby raise exception with arguments.
Passing the wrong number of arguments 1 2 3.
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In a nutshell every custom ruby exception should extend standarderror rather than the exception class the reason for this is outlined in exception handling in ruby with this in mind the simplest custom exception class that we can define will look something like this.
First 4 5 raises the exception.
Passing an argument that is not acceptable.
For each rescue clause in the begin block ruby compares the raised exception against each of the parameters in turn.
Wrong number of arguments given 2 expected 1 ex.
Raised when the arguments are wrong and there isn t a more specific exception class.
In this article we will look at.
The match will succeed if the exception named in the rescue clause is the same as the type of the currently thrown exception or is a superclass of that exception.
In ruby like in most languages an exception is a way to convey that something went wrong.
The match will succeed if the exception named in the rescue clause is the same as the type of the currently thrown exception or is a superclass of that exception.