How do I create custom exceptions in Ruby?

How do I create custom exceptions in Ruby?

In Ruby, you can create a custom exception by defining a new class that inherits from the built-in StandardError class.

Can you show me an example of a custom exception?

Sure! Here's a simple example:

class MyCustomError < StandardError
  def initialize(msg="My custom error occurred")
    super
  end
end

raise MyCustomError.new("Something went wrong!")

What should I do if I want to rescue my custom exception?

You can rescue your custom exception just like any other exception. For example:

begin
  raise MyCustomError
rescue MyCustomError => e
  puts e.message
end

Are there any best practices for using custom exceptions?

Yes, it's best to use custom exceptions for specific error handling, keep their names descriptive, and document their usage.