Web Reference: [ Ruby Foundations ] 39 - Exceptions When you need to raise an exception, you can use one of the built-in Exception classes, or you can create one of your own. If you create your own, you might want to make it a subclass of StandardError or one of its children. The exception is matched to the rescue section starting at the top, and matches only once. If an ArgumentError is raised in the begin section, it will not be handled in the StandardError section.
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