CODEWITHSUNDEEP
ruby
Mike
Mike

Reputation: 35

What is the significance of the provided code in Ruby?

I am new to Ruby. What I understood from below code that a New class MyClass is created with in the ABC module. What #1 to #4 is doing. Is this throwing different exceptions which is a subtype of CommonError?

class ABC::MyClass

  class AException < CommonError; end   #1
  class BException < CommonError; end   #2
  class CFailure < CommonError; end     #3
  class DException < CommonError; end   #4

  include ABC::Something

  # ::::::::::::::::::::::::::::::::::::

end 

class CommonError < Exception
end

Upvotes: 0

Views: 60

Answers (1)

tadman
tadman

Reputation: 211740

That's just defining specific exceptions that can, presumably, be used within the code somewhere else, as in:

raise AException, "Something went wrong!"

This means you can rescue those later:

begin
  do_stuff!
rescue AException => e
  puts "Uh oh, AException went off! Those are super bad!"
  puts e # The message supplied in the raise call
end

The reason for CommonError is to act as a base-class for all these other exceptions. The argument to rescue is actually not a specific class, but a class and all subclasses, so if you rescue CommonError you get to capture all of these and potentially others defined elsewhere.

Upvotes: 4

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