[Solved] How can you modify this Ruby class so that respond_to? correctly returns true for methods starting with process_?class Processor def method_missing(method_name, *args) if method_name.to_s.start_with?... | Ruby

Ruby - Metaprogramming Fundamentals

How can you modify this Ruby class so that respond_to? correctly returns true for methods starting with process_?

class Processor
  def method_missing(method_name, *args)
    if method_name.to_s.start_with?("process_")
      "Processing #{args.join(", ")}" 
    else
      super
    end
  end
end

AAdd <code>def respond_to_missing?(method_name); true; end</code>

BOverride <code>respond_to?</code> to always return true.

C

Add <code>def respond_to_missing?(method_name, include_private = false); method_name.to_s.start_with?("process_"); end</code>

DNo modification needed; respond_to? works automatically.

Step-by-Step Solution

Solution:

Step 1: Understand respond_to? behavior
By default, respond_to? does not know about dynamic methods handled by method_missing.
Step 2: Implement respond_to_missing?
To inform respond_to? about dynamic methods, define respond_to_missing? with the same logic as method_missing uses.
Step 3: Correct implementation
Define respond_to_missing?(method_name, include_private = false) returning true if method_name starts with "process_".
Final Answer:
Add respond_to_missing? with method_name and include_private parameter checking method_name prefix. -> Option C
Quick Check:
Does respond_to_missing? match method_missing logic? Yes. [OK]

Quick Trick: Match respond_to_missing? logic with method_missing for dynamic methods [OK]

Common Mistakes:

Overriding respond_to? incorrectly
Omitting include_private parameter
Assuming respond_to? auto-detects method_missing

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How can you modify this Ruby class so that respond_to? correctly returns true for methods starting with process_?

Step 1: Understand respond_to? behavior

Step 2: Implement respond_to_missing?

Step 3: Correct implementation

Final Answer:

Quick Check:

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