What is the issue with this Ruby class's respond_to_missing? method?
medium📝 Debug Q6 of 15
Ruby - Metaprogramming Fundamentals
What is the issue with this Ruby class's respond_to_missing? method?
class Example
def respond_to_missing?(method_name)
method_name == :bar
end
def method_missing(method_name, *args)
"bar called" if method_name == :bar
end
end
AThe <code>respond_to_missing?</code> method is missing the <code>include_private</code> parameter.
BThe <code>method_missing</code> method should call <code>super</code> when method_name is not :bar.
CThe <code>respond_to_missing?</code> method should return true for all methods.
DThe class should not define <code>method_missing</code> without defining <code>respond_to?</code>.
Step-by-Step Solution
Solution:
Step 1: Check respond_to_missing? signature
The method is missing the second parameter include_private, which is required for proper overriding.
Step 2: Understand consequences
Without the correct signature, Ruby's respond_to? may not behave correctly.
Final Answer:
The respond_to_missing? method is missing the include_private parameter. -> Option A
Quick Check:
Signature must match Ruby's expected parameters [OK]
Quick Trick:respond_to_missing? must accept include_private parameter [OK]
Common Mistakes:
Ignoring the include_private parameter
Not calling super in method_missing
Returning incorrect boolean values
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