Ruby - Modules and Mixins
Why does including a module with methods defined as
self.method_name not add those methods as instance methods to a class?Why does including a module with methods defined as self.method_name not add those methods as instance methods to a class?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand method definition with self
Methods defined asself.method_nameare singleton (class) methods of the module.Step 2: Effect of include on methods
Including a module adds its instance methods to the class, but singleton methods are not included.Final Answer:
Because methods defined with self are module's singleton methods, not instance methods -> Option BQuick Check:
Self.method_name = module class method, not included [OK]
Quick Trick: Self.method_name defines module class methods, not instance methods [OK]
Common Mistakes:
- Thinking include adds module class methods
- Confusing instance variables with methods
- Believing Ruby disallows module methods
Master "Modules and Mixins" in Ruby
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