Web Reference: [ Ruby Foundations ] 39 - Exceptions Ruby organizes all errors into a class hierarchy rooted at Exception. Understanding this tree is the first step to writing robust error handling, because rescuing the wrong class can make your program impossible to interrupt or debug. 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.
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