Question

I came across a usage such as:

InvalidRequest = Class.new(StandardError)

I am confused that:

• what’s the meaning to pass an argument to Class.new?
• What is the relationship between InvalidRequest, StandError and Class now?

Answer 1

It sets up a class with the argument as the super class.

what’s the meaning to pass an argument to Class.new?

The argument is used as the superclass for a new anonymous class, which is returned.

What is the relationship between InvalidRequest, StandError and Class now?

InvalidRequest is a Class which inherits from StandardError.

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It’s functionally equivalent to:

class InvalidRequest < StandardError
end

Just in a more functional programming style.