Web Reference: If we use instance_eval to define a method on a class, it will define a method for just that instance of class, not all classes. We might call that method a class method, but it is just an instance method for that particular class. These two are class_eval and instance_eval. The names are very similar, and their behavior is counterintuitive. The bottom line is this: Use ClassName.instance_eval to define a class method (one associated with the class object but not visible to instances). When we use instance_eval on a class, we’re executing code in the context of that specific class–that class is now set to self, so if we defined a method, we’d be writing class methods for the class we called instance_eval on.
YouTube Excerpt: This video explains the difference between
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