Ruby Error Handling

Rescue lets you create more robust solutions by providing a simple way to deal with common errors that might occur in your program.

Ruby error handling.

You get a chance to handle recover from the error. So these types of errors were handled by the rescue block. After reading 2 or 3 articles on the basics of ruby exception handling you re bound to see the advice on never rescuing exception. Ruby exceptions and error handling is not the most remarkable feature of the ruby language.

Ruby gives you a few keywords to implement error recovery in your code. Two ruby statements have default exception classes. New msg nil exception click to toggle source. Here error means an unwanted or unexpected event which occurs during the execution of a program i e.

We call this exception handling. Ruby provide a nice mechanism to handle exceptions. Use ruby s built in tools to handle errors and exceptions and even write your own custom exceptions. These keywords are begin rescue.

Construct a new exception object optionally passing in a message. At run time that disrupts the normal flow of the program s instructions. With this in mind the simplest custom exception class that we can define will look something like this. Class mycustomexception standarderror end.

In ruby exception handling is a process which describes a way to handle the error raised in a program. Infact the way ruby deals with exceptions is strikingly similar to other languages such as java etc. 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. It s vastly easier to use than error codes.

The rescue block in ruby is very powerful. Exception is the root of the exception class library the. At a minimum you can provide a graceful shutdown and reporting of problems in your code. Handling an exception to do exception handling we enclose the code that could raise an exception in a begin end block and use one or more rescue clauses to tell ruby the types of exceptions we want to handle.

So exceptions are used to handle various type of errors which may occur during a program execution and take appropriate action instead of halting program completely.